5. Factor
x²-x-72
(x-8)(x+9)
(x-6)(x+12)
(x+6)(x-12)
(x+8)(x-9)

A. Modelling Attendance for the first 5 years The decrease in attendance each year for the annual town international food festival is 20%. Therefore, the number of people attending the festival in year 1 is x.

From year 1 to year 2, the attendance will decrease by 20%. Therefore, the attendance for year 2 can be modeled as 0.8x.From year 2 to year 3, the attendance will again decrease by 20%. Therefore, the attendance for year 3 can be modeled as 0.8 × 0.8x = (0.8)²xFrom year 3 to year 4, the attendance will again decrease by 20%. Therefore, the attendance for year 4 can be modeled as 0.8 × (0.8)²x = (0.8)³xFrom year 4 to year 5, the attendance will again decrease by 20%.

Therefore, the attendance for year 5 can be modeled as 0.8 × (0.8)³x = (0.8)⁴xTherefore, the attendance for the first 5 years can be modeled as :[tex]x, 0.8x, (0.8)²x, (0.8)³x, (0.8)⁴x.B[/tex]. Attendance in 10  If the attendance decreases by 20% each year, then in 10 years, the attendance will decrease by 20% ten times. Therefore, the attendance in 10 years can be modeled as 0.8¹⁰x = 0.107x (rounded to three decimal places) or approximately 10.7% of the attendance in year 1.

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It will take approximately 4.02 years for the tube to have 200 million bacteria.

The exponential growth formula can be used to determine how long it will take for the tube to contain 200 million bacteria:

N = N₀ (1 + r)ⁿ

Where:

N is the final population size (200 million bacteria)

N₀ is the initial population size (50 million bacteria)

r is the growth rate (27% or 0.27)

n is the time in years

Putting the values,

200,000,000 = 50,000,000 (1 + 0.27)ⁿ

4 = (1 + 0.27)ⁿ

Taking the logarithm of both sides, we have:

log(4) = log((1 + 0.27)ⁿ)

n = log(4) / log(1 + 0.27)

n ≈ 4.02

Therefore, it will take approximately 4.02 years for the tube to have 200 million bacteria.

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Let's put the value of d into the equation and see if it works.5d + 5.25 = 60.2 5(10.99) + 5.25 = 60.2 54.95 + 5.25 = 60.2 60.2 = 60.2It works, and therefore, the answer is correct.

Emma spent $60.20 on 5 dozen bagels and a gallon of iced tea. The price of the gallon of iced tea was $5.25. The following equation can be used to find d, the price of each dozen of bagels. 5d + 5.25 = 60.2

What was the price of each dozen of bagels?

Solution:To find the price of a dozen bagels, we have to isolate the variable d by performing the same operation on both sides of the equation.5d + 5.25 = 60.2 - 5.25 5d = 54.95 d = 54.95/5 d = 10.99Therefore, the price of each dozen of bagels was $10.99.Check:Let's put the value of d into the equation and see if it works.5d + 5.25 = 60.2 5(10.99) + 5.25 = 60.2 54.95 + 5.25 = 60.2 60.2 = 60.2It works, and therefore, the answer is correct.

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Answer:

9/100

Step-by-step explanation:

put it into ur calculator

The components of the velocity vector of the boat are approximately -37.62 km/hr in the x-direction (west) and -13.68 km/hr in the y-direction (south).

To find the components of the velocity vector of a boat moving at 40 km/hr in a direction 20° south of west, assuming north is in the positive y-direction.

Step 1: Convert the given angle to a standard angle (measured counterclockwise from the positive x-axis).

Since the boat is moving 20° south of west, we can find the standard angle by adding 180° to 20°.
Standard angle = 180° + 20° = 200°

Step 2: Calculate the x and y components of the velocity vector using trigonometry.

x-component = velocity * cos(standard angle)
y-component = velocity * sin(standard angle)

Step 3: Plug in the values and calculate the components.

x-component = 40 * cos(200°) ≈ -37.62 km/hr
y-component = 40 * sin(200°) ≈ -13.68 km/hr

In conclusion, the components of the velocity vector of the boat are approximately -37.62 km/hr in the x-direction (west) and -13.68 km/hr in the y-direction (south).

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The cdf for the random variable x is given by:
[tex]f_{x} (x)[/tex] = {   0             if x < -3
                               0.4             if -3 <= x < 5
                               0.8             if 5 <= x < 7
                                   1             if x >= 7   }

The probability of x = 5 is 0.

To find the probability of a specific value for a random variable, we use the probability mass function (pmf). The pmf is the derivative of the cumulative distribution function (CDF).
In this case, the cdf for the random variable x is given by:
[tex]f_{x} (x)[/tex] = {   0             if x < -3
                               0.4             if -3 <= x < 5
                               0.8             if 5 <= x < 7
                                   1             if x >= 7   }
To find the pmf, we take the derivative of fx(x) for each range of values:
P(x < -3) = 0 (no probability of x being less than -3)
P(x = -3) = [tex]f_{x}[/tex](-3) - [tex]f_{x}[/tex](-3-) = 0.4 - 0 = 0.4
P(-3 < x < 5) = [tex]f_{x}[/tex](5-) - [tex]f_{x}[/tex](-3) = 0.8 - 0.4 = 0.4
P(x = 5) = [tex]f_{x}[/tex](5) - [tex]f_{x}[/tex](5-) = 0.8 - 0.8 = 0
P(5 < x < 7) = [tex]f_{x}[/tex](7-) - [tex]f_{x}[/tex](5) = 1 - 0.8 = 0.2
P(x >= 7) = [tex]f_{x}[/tex](∞) - [tex]f_{x}[/tex](7-) = 0 - 1 = 0
Therefore, the probability of x = 5 is 0.

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(a) To find the equation of the tangent line to h(x) = f(g(x)) at x = 2, we need to determine the derivative of h(x) and evaluate it at x = 2.

(b) To find F'(3) for F(x) = f(x)g(x), we need to calculate the derivative of F(x) and evaluate it at x = 3.

(a) The chain rule can be used to find the derivative of h(x). We first find the derivative of f(g(x)) with respect to g(x), which is f'(g(x)). Then, we multiply it by the derivative of g(x) with respect to x, g'(x). So, h'(x) = f'(g(x)) * g'(x). To find the equation of the tangent line at x = 2, we evaluate h'(x) at x = 2 and substitute the value into the point-slope form of a line using the coordinates (2, h(2)).

(b) To find F'(x), we apply the product rule, which states that the derivative of F(x) = f(x)g(x) is F'(x) = f'(x)g(x) + f(x)g'(x). We substitute x = 3 into F'(x) to find F'(3) by evaluating the derivatives of f(x) and g(x) at x = 3, and then performing the necessary calculations.

Note: The specific functions f(x) and g(x) and their derivatives are not provided in the given information, so their values would need to be determined or given to obtain the exact solutions for the equations of the tangent line and F'(3)

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Hello!

AB // CD => Thalès !

AO/OD = BO/OC = AB/CD

if BO = 24: (if not tell me in comments)

24/5 = AB/7.5

AB = 24 × 7.5 ÷ 5 = 36

Answer:

Since Ab||Cd

OB/AB=OC/CD

2/AB=5/7.5

AB=7.5×2/5

AB=3cm

Step-by-step explanation:

The eigenvalues of matrix A are 2, 3, and 4. When a=2, the eigenspaces for each eigenvalue can be found by solving the corresponding systems of linear equations. Therefore, when a=2, the eigenspace corresponding to λ=2 has basis [-2, 1, 0].

To find the eigenvalues of matrix A, we need to solve the characteristic equation det(A-λI) = 0, where I is the 3x3 identity matrix. Using the formula for the determinant of a 3x3 matrix, we get:

det(A-λI) = (3-λ)(2-λ)(1-a) + 2(2-λ)(a) + 1(3)(1) - 0(0) - 2(1-a)(0) - 0(3-λ)(0)

Simplifying and setting the determinant equal to zero, we get:

(λ-2)(λ-3)(λ-4) + 2(a-2)(λ-3) = 0

This equation can be solved for λ to get the three eigenvalues: λ = 2, 3, and 4.

Now suppose that a=2. To find a basis for the eigenspace corresponding to each eigenvalue, we need to solve the system of linear equations (A-λI)x = 0, where λ is the eigenvalue and x is a non-zero vector in the eigenspace. For λ=2, we need to solve the system:

⎡⎢⎣1002-102⎤⎥⎦x = 0

which reduces to the two equations x1 = -2x2 and x2 = x2, or x = t[-2, 1, 0] for some scalar t. This gives us a basis for the eigenspace corresponding to λ=2.

Similarly, for λ=3, we need to solve the system:

⎡⎢⎣0001-102⎤⎥⎦x = 0

which reduces to the single equation x4 = 0. So any vector of the form [x1, x2, x3, 0] is in the eigenspace corresponding to λ=3. A basis for this eigenspace can be obtained by choosing any three linearly independent vectors of this form.

Finally, for λ=4, we need to solve the system:

⎡⎢⎣-1002-102⎤⎥⎦x = 0

which reduces to the two equations x1 = 2x2 and x2 = -x2, or x = t[1, -2, 1] for some scalar t. This gives us a basis for the eigenspace corresponding to λ=4.

Therefore, when a=2, the eigenspace corresponding to λ=2 has basis [-2, 1, 0], the eigenspace corresponding to λ=3 has any three linearly independent vectors of the form [x1, x2, x3, 0], and the eigenspace corresponding to λ=4 has basis [1, -2, 1].

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The set of vectors {(3, 2, 1, −6), (0, 6, 0, 2)} in [tex]R^n[/tex] is orthogonal.

To determine if the given set of vectors {(3, 2, 1, -6), (0, 6, 0, 2)} in [tex]R^n[/tex] is orthogonal, we must check if their dot product is zero. Orthogonal vectors are perpendicular to each other, and their dot product is an indicator of their orthogonality.
Let's take the dot product of the two given vectors:

A = (3, 2, 1, -6)
B = (0, 6, 0, 2)
Dot product (A•B) = (3×0) + (2×6) + (1×0) + (-6×2) = 0 + 12 + 0 - 12 = 0
Since the dot product of the two vectors is zero, we can conclude that the set of vectors is orthogonal.
Therefore, the correct answer is (a) orthogonal.

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The best measure of variability for the data and determine which player was more consistent is C. Player A is the most consistent, with an IQ of 1.5.

For Player A, the third quartile is 3 and the first quartile is 1.5. Therefore, the IQR is 3 - 1.5 = 1.5.

For Player B, the third quartile is 5 and the first quartile is 1. Therefore, the IQR is 5 - 1 = 4.

Therefore, Player A is the most consistent, with an IQR of 1.5.

The range is not a good measure of variability because it is affected by outliers.

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When we are considering a random integer selected from the range from 2 to 10,000,000,000, there are 9,999,999,999 possible integers to choose from. Now, we need to determine how many of these integers are prime.

One way to approach this problem is to use the Prime Number Theorem, which states that the number of primes less than or equal to x is approximately x/ln(x). Using this theorem, we can estimate the number of primes less than or equal to 10,000,000,000 as:

[tex]\frac{10,000,000,000}{ln(10,000,000,000)} ≈ 455,052,511[/tex]

Therefore, there are approximately 455,052,511 prime numbers in the range from 2 to 10,000,000,000.

To find the probability of selecting a prime number, we need to divide the number of primes by the total number of integers in the range:

455,052,511/9,999,999,999 ≈ 0.0455

So, the chances of selecting a prime number from the range from 2 to 10,000,000,000 is approximately 0.0455 or 4.55%.

It is important to note that this is only an approximation based on the Prime Number Theorem and the actual number of primes in the range may differ slightly from this estimate. However, it gives us a good idea of the likelihood of selecting a prime number from this range.

Christa sliced the pyramid perpendicular to its base through one edge. The Option A .

A cross section means the view that shows what the inside of something looks like after a cut has been made across it. To determine how Christa sliced the cross section, let's consider the properties of a rectangular pyramid.

The rectangular pyramid has a rectangular base and triangular faces that converge at a single point called the apex. Since Christa sliced the pyramid through one edge perpendicular to its base, the resulting cross section would have the same shape as the base which is a rectangle.

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Please provide a photo.

Okay, let's break this down step-by-step:

* The mean value theorem for derivatives states that for any continuous function f(x) on a closed interval [a,b], there exists a number c in that interval such that f'(c) = (f(b) - f(a)) / (b - a).

* In this problem, the interval is [1, 4].

* So we need to find f(4) - f(1) and 4 - 1.

* If f(x) approximately equals some other value over this interval, we can use that approximate value. Say f(x) approximates to some constant C over [1, 4].

* Then f(4) - f(1) would be approximately (4 - 1) * C = 3C.

* And 4 - 1 = 3.

* So by the mean value theorem, there must exist a c in (1, 4) such that:

f'(c) = (3C) / 3 = C

Therefore, the approximate value of f'(c) would be the same as the approximate constant value of f(x) over the interval.

Does this make sense? Let me know if you have any other questions!

Thus, if f(x) is increasing over this interval, then f'(c) should be positive; if f(x) is decreasing, then f'(c) should be negative.

The Mean Value Theorem is a fundamental theorem of calculus that relates the average rate of change of a function over an interval to its instantaneous rate of change at a specific point within that interval.

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Having Tony Stark review the questionnaire enhances construct validity by ensuring the questions accurately measure the intended traits.

By having Tony Stark review the questionnaire that Dr. Bruce Banner is planning to give to a sample of Marvel characters, the type of validity that is enhanced is construct validity.

Construct validity refers to the extent to which a measurement tool accurately assesses the underlying theoretical construct or concept that it is intended to measure.

In this scenario, by having Tony Stark, who is knowledgeable about the Marvel characters and their characteristics, review the questionnaire, it helps ensure that the questions are relevant and aligned with the construct being measured.

Tony Stark's input can help verify that the questions capture the intended traits, abilities, or attributes of the Marvel characters accurately.

Construct validity is crucial in research or assessments because it establishes the meaningfulness and effectiveness of the measurement tool. It ensures that the questionnaire measures what it claims to measure, in this case, the specific characteristics or attributes of the Marvel characters.

By having an expert review the questionnaire, it increases the confidence in the construct validity of the instrument and enhances the overall quality and accuracy of the data collected from the sample of Marvel characters.

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The Success/Failure condition states that both np and n(1-p) must be greater than or equal to 10, where n is the sample size and p is the probability of success (in this case, the probability of a defect occurring).

In this case, the sample size is 500 and the company makes 7,000 items each day, so the population size is much larger than the sample size. Therefore, we can use the adjusted formula for np and n(1-p):

np = n * P = 500 * 0.03 = 15
n(1-p) = n * (1-P) = 500 * 0.97 = 485

Both np and n(1-p) are greater than 10, so the Success/Failure condition is met.

Therefore, the answer is c. Yes.

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The answer to your question is that the two general parts of the statistical mechanical expression for kp are the partition function and the reaction quotient.

The partition function is a fundamental concept in statistical mechanics that describes the distribution of particles among the available energy states in a system. It is used to calculate the probability of a system being in a particular state, and is a function of the temperature and the system's energy levels.

On the other hand, the reaction quotient is a measure of the relative amounts of reactants and products present in a chemical reaction at a given moment in time. It is calculated by dividing the concentrations (or partial pressures) of the products by the concentrations (or partial pressures) of the reactants, each raised to the power of its stoichiometric coefficient.

The statistical mechanical expression for kp therefore combines these two concepts, using the partition function to describe the distribution of energy states among the reactants and products, and the reaction quotient to determine the relative amounts of these species present in the reaction. The resulting expression provides a quantitative relationship between the equilibrium constant kp and the thermodynamic properties of the system, such as the temperature and the enthalpy and entropy changes associated with the reaction.

In summary, the two general parts of the statistical mechanical expression for kp are the partition function and the reaction quotient, which are used to describe the distribution of energy states and the relative amounts of reactants and products, respectively.

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A rectangle has a a perimeter of 72 ft. The length and width are scaled by a factor 3. 5.

The perimeter of the new rectangle, which is the sum of its sides, is given by: P' = 2(l' + w')P' = 2(3.5l + 3.5w)P' = 2(3.5(l + w))P' = 2(3.5 x 36)P' = 2(126)P' = 252ft.

Therefore, the perimeter of the resulting rectangle is 252 ft.

Let the width of the rectangle be "w" and its length be "l".

Since the perimeter of a rectangle is the sum of the length of its sides, we can write:2(l + w) = 72ft(l + w) = 36ft

We can now find the ratio of the new length and width to the old ones: l' / l = 3.5 and w' / w = 3.5 .

The perimeter of the new rectangle, which is the sum of its sides, is given by:P' = 2(l' + w')P'

= 2(3.5l + 3.5w)P'

= 2(3.5(l + w))P' = 2(3.5 x 36)P'

= 2(126)P' = 252ft

Therefore, the perimeter of the resulting rectangle is 252 ft.

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The given set of probabilities are: (a) p(E1|E3) = 3/10, (b) p(E3|E2) = 1/2, (c) p(E2|E3) = 3/10, (d) p(E3|E1 ∩ E2) = 1/3, (e) E1 and E2 are not independent, (f) E2 and E3 are not independent.

(a) To find p(E1|E3), we need to find the probability that the bit string begins with 1 given that it has exactly three 1s. Let A be the event that the bit string begins with 1 and B be the event that the bit string has exactly three 1s. Then,

p(E1|E3) = p(A ∩ B) / p(B)

To find p(A ∩ B), we need to count the number of bit strings that begin with 1 and have exactly three 1s. There is only one such string, which is 10011. To find p(B), we need to count the number of bit strings that have exactly three 1s. There are 10 such strings, which can be found using the binomial coefficient:

p(B) = C(5,3) / 2^5 = 10/32 = 5/16

Therefore, p(E1|E3) = p(A ∩ B) / p(B) = 1/10.

(b) To find p(E3|E2), we need to find the probability that the bit string has exactly three 1s given that it ends with 1. Let A be the event that the bit string has exactly three 1s and B be the event that the bit string ends with 1. Then,

p(E3|E2) = p(A ∩ B) / p(B)

To find p(A ∩ B), we need to count the number of bit strings that have exactly three 1s and end with 1. There are two such strings, which are 01111 and 11111. To find p(B), we need to count the number of bit strings that end with 1. There are two such strings, which are 00001 and 00011.

Therefore, p(E3|E2) = p(A ∩ B) / p(B) = 2/2 = 1.

(c) To find p(E2|E3), we need to find the probability that the bit string ends with 1 given that it has exactly three 1s. Let A be the event that the bit string ends with 1 and B be the event that the bit string has exactly three 1s. Then,

p(E2|E3) = p(A ∩ B) / p(B)

To find p(A ∩ B), we need to count the number of bit strings that have exactly three 1s and end with 1. There are two such strings, which are 01111 and 11111. To find p(B), we already found it in part (a), which is 5/16.

Therefore, p(E2|E3) = p(A ∩ B) / p(B) = 2/5.

(d) To find p(E3|E1 \ E2), we need to find the probability that the bit string has exactly three 1s given that it begins with 1 but does not end with 1. Let A be the event that the bit string has exactly three 1s, B be the event that the bit string begins with 1, and C be the event that the bit string does not end with 1. Then,

p(E3|E1 \ E2) = p(A ∩ B ∩ C) / p(B ∩ C)

To find p(A ∩ B ∩ C), we need to count the number of bit strings that have exactly three 1s, begin with 1, and do not end with 1.

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The function to represent the mass of the sample after t years is

f(t) = 296.3895(0.4783)^t.

Given data: X is a radioactive isotope such that its mass decreases by 90% every year.

If an experiment starts out with 620 grams of Element X

We need to find a function to represent the mass of the sample after t years, where the daily rate of change can be found from a constant in the function.
Now, the percentage rate of change per day can be found as follows:

After one year, the mass decreases by 90%

So, at the end of the first year, the remaining mass

= 620 × 0.1

= 62 grams

Therefore, the percentage decrease in mass in one day

= (620 - 62) / 365

= 1.5 grams per day (approx.)

Thus, the percentage rate of change per day is

1.5 / 620

≈ 0.0024,

i.e., 0.24% per day

.A function to represent the mass of the sample after t years, where the daily rate of change can be found from a constant in the function can be represented by

Exponential function:

A = Ao * (1 - r) ^ t

Here, A = mass after t years

f(t)Ao = initial mass

= 620

r = percentage rate of change per day / 100

t = time in years

So, the function to represent the mass of the sample after t years is

f(t) = 620(0.1)^t or f(t)

= 620(0.9)^t

(As the mass decreases by 90% each year)

Hence, the required function is

f(t) = 620(0.9) ^ t

Round all coefficients in the function to four decimal places.

620 (0.9) ^ t = 620 (0.4783) ^ t

Hence, the required function is:

f(t) = 296.3895 (approx) * (0.4783) ^ t

Therefore, the function to represent the mass of the sample after t years is

f(t) = 296.3895(0.4783)^t.

Rounding to four decimal places, we get

f(t) ≈ 296.3895(0.4783)^t,

which is the required function.

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Answer:

------------------

25 minutes is 10 times the 2 1/2 = 2.5 minutes.

Therefore David would swim 10 times greater distance in 25 minutes:

The matching choice is B.

In hex addition, values greater than 16 are mentally converted to their corresponding hexadecimal digits and then added together.

In hex addition, when the sum of two hexadecimal digits is greater than 15 (equivalent to 16 in base 10), it results in a carry.

To perform the addition mentally, you convert the carry value to its corresponding hexadecimal digit (A for 10, B for 11, C for 12, D for 13, E for 14, and F for 15) and add it to the next column. This process continues until there are no more carries left.

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The inequality that correctly compares Hailey's account values is: $117.39 > -$121.06.

To correctly compare the account values, we can use the inequality symbol.

Since Hailey has $117.39 in her savings account and -$121.06 in her checking account, the correct inequality to compare the values is:

Savings account value > Checking account value

Therefore, the correct inequality is:

$117.39 > -$121.06

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AIn problems 7 and 8, we need to find the solution of the given initial-value problem where x(0) = 1 and x'(0) = -3x. To solve this differential equation, we can separate the variables and integrate both sides. This gives us x(t) = e^(-3t/2). Thus, the solution of the initial-value problem is x(t) = e^(-3t/2) with x(0) = 1. The behavior of the solution as t approaches infinity is that x(t) approaches zero. This is because the exponential term e^(-3t/2) decays to zero as t becomes large.

To solve the given initial-value problem, we can use separation of variables. We start by separating the variables and get dx/x = -3/2 dt. Integrating both sides, we get ln|x| = -3t/2 + C, where C is a constant of integration. Solving for x, we get x = Ce^(-3t/2). We can then use the initial condition x(0) = 1 to find C. Plugging in x = 1 and t = 0, we get C = 1. Thus, the solution of the initial-value problem is x(t) = e^(-3t/2) with x(0) = 1.

To describe the behavior of the solution as t approaches infinity, we can look at the exponential term e^(-3t/2). As t becomes larger and larger, e^(-3t/2) approaches zero. This means that x(t) approaches zero as t approaches infinity. We can also see this by looking at the graph of the solution, which decays to zero as t becomes larger.

In conclusion, the solution of the initial-value problem x(0) = 1 and x'(0) = -3x is x(t) = e^(-3t/2). The behavior of the solution as t approaches infinity is that x(t) approaches zero. This is because the exponential term e^(-3t/2) decays to zero as t becomes large.

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Analysing the statements given, expressions 1, 3and 5 represents the relationship while 2 and 4 doesn't .

The size relationship between rabbits after 6 and 3 years can be examined thus :

Using division :

3⁶/3³ = [tex] {3}^{6 - 3} = {3}^{3} = 27[/tex]

Using the expression above, the right expressions are:

Hence , expressions 1, 3 and 5 are correct while 2 and 4 are incorrect.

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Cluster sampling is a probability sampling method that involves dividing the population into smaller groups or clusters, usually based on geographic location or other criteria. These clusters are then randomly selected, and all individuals within the selected clusters are included in the sample. The correct option is c.

This method is commonly used when it is impractical or too expensive to obtain a complete list of all individuals in the population, but it is still important to ensure that the sample is representative of the population as a whole.

Cluster sampling is different from convenience sampling, which is a nonprobability sampling method that involves selecting individuals who are easily accessible or convenient to include in the sample. Convenience sampling is often used in situations where it is difficult or impossible to obtain a representative sample, such as when conducting surveys of customers in a store or visitors at a public event.

Overall, cluster sampling is an effective and efficient way to obtain a representative sample of a population, especially when the population is large or geographically dispersed. However, it is important to ensure that the clusters are truly representative of the population, and that random selection is used within each cluster to avoid bias or skewed results.

Thus, the correct option is c.

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The number of students in Spring Lake Elementary School is given by 480.

The total number of students in Spring Lake Elementary School is given by = 600.

The percentage of students in Spring Lake Elementary School were absent on Monday is given by = 20 %.

So, the percentage of students in Spring Lake Elementary School were present on Monday is given by = (100 - 20) % = 80 %.

Thus, the number of students in Spring Lake Elementary School is given by = 80% of 600

= 600*80%

= 600 * (80/100)

= 6 * 80

= 480

Hence the number of students in Spring Lake Elementary School is given by 480.

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To increase the length of a brass rod by 2%, the temperature should increase by 1000 K, assuming a coefficient of linear expansion of 0.00002K⁻¹.

To solve problem 11.43, we need to calculate the change in temperature (∆T) required to increase the length of the brass rod by 2% when the coefficient of linear expansion (∝) is given as 0.00002K⁻¹.

The formula for the change in length (∆L) due to a change in temperature (∆T) is given by

∆L = ∝ * L0 * ∆T

Where

∆L is the change in length

∝ is the coefficient of linear expansion

L0 is the initial length

∆T is the change in temperature

In this case, we are given that the initial length (L0) is 4 ft and the desired change in length is 2% of the initial length. We can calculate the change in length (∆L) as follows:

∆L = 2% * 4 ft = 0.02 * 4 ft = 0.08 ft

Now, we can rearrange the formula to solve for ∆T:

∆T = ∆L / (∝ * L0)

∆T = 0.08 ft / (0.00002K⁻¹ * 4 ft)

∆T = 0.08 ft / (0.00008 K⁻¹)

∆T = 1000 K

Therefore, to increase the length of the brass rod by 2%, the temperature should increase by 1000 K.

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--The given question is incomplete, the complete question is given below " 11. 44 solve prob. 11. 43, assuming that the length of the brass rod is increased from 4 ft to 8 ft. To increase the length of brass rod by 2% its temperature should increase by:(∝=0.00002 K^−1 ) "--

The distance AD from the house to the school is given as follows:

AD = 10.63 km.

The Pythagorean Theorem states that in a right-angled triangle, the square of the length of the hypotenuse (the longest side) is equal to the sum of the squares of the lengths of the other two sides.

The theorem is expressed as follows:

c² = a² + b².

In which:

The distance in this problem can be represented by the hypotenuse of a right triangle, in which the sides are of 8 km and 3 + 4 = 7 km.

Hence the distance is given as follows:

d² = 7² + 8²

[tex]d = \sqrt{7^2 + 8^2}[/tex]

AD = 10.63 km.

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