I need help … please

The time taken by the ball to reach the ground is 11.5 seconds.

The mathematical expression combines numerical variables and operations denoted by addition, subtraction, multiplication, and division signs.

Mathematical symbols can be used to represent numbers (constants), variables, operations, functions, brackets, punctuation, and grouping. They can also denote the logical syntax's operation order and other properties.

Suppose a ball was dropped from a TV tower 2120 feet high. The time it takes an object to free-fall from the top of this tower to the ground can be represented by the equation s = -16t² + 2120.

The time will be calculated as,

s = -16t² + 2120

Equate with zero as the ball reaches the ground the height s becomes zero.

-16t² + 2120 = 0

-16t² = -2120

t² = 2120 / 16

t² = 132.5

t = √132.5

t = 11.5 seconds

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Answer:

Step-by-step explanation:

9)

60/40 =                             divide both side by 10

6/4 =                                  divide both side by 2

3/2

10)

28/63 =                            divide both side by 7

4/9

11)

45/120 =                             divide both side by 15      

3/8          

When a number has an exponent of 0, it means that the number is being multiplied by itself 0 times. In other words, it is multiplied by 1.

To determine this:

In the case of 3 with an exponent of 0, it would be represented as 3^0. To calculate the value, we would take 3 and multiply it by 0 times.

3 x 1 = 3

So, 3 with an exponent of 0 is equal to 3.

It is important to note that any number with an exponent of 0 will always equal 1, except for 0 which will always be 0. This is because any number multiplied by 1 is itself, and 0 multiplied by any number is always 0.

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The new diameter of the sphere after the air is added is 32.6cm

A sphere is a solid figure bounded by a curved surface such that every point on the surface is the same distance from the centre.The Surface Area of Sphere is 4πr², where r is the radius of sphere.

The original surface area when air is not added. is :

A = 4×3.14×15²

A = 2826cm²

When air is added, the surface area increased by 500cm². Therefore the new surface area = 2826+500 =3326cm²

To find the new radius of the sphere

3326 = 4×3.14× r²

r² = 3326/12.56

r² = 265

r = √265

r = 16.3

the diameter of the balloon after the air is added = 2r = 2× 16.3 = 32.6 cm

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Answer: To find the area that 1.6 litres of paint will cover, we can use the unit rate. The unit rate is a way to compare different quantities by finding how much of one quantity corresponds to one unit of another quantity.

We know that 750ml of paint covers an area of 12 m2, this means that the unit rate of paint:area is 750ml:12m^2

We can use this to find the area that 1.6 litres of paint will cover.

First we should convert the 1.6 litres of paint to milliliters, since we have the unit rate in ml:

1.6 litres = 1.6*1000 ml = 1600 ml

Now we can use the unit rate to find the area that 1.6 litres of paint will cover:

Area = (1600 ml paint) * (12 m2/750ml paint) = 21.333 m2

So, 1.6 litres of paint will cover approximately 21.333 m^2

Note that you could also use the proportion (750ml/12m^2) = (1600ml/x) to find the value of x.

Step-by-step explanation:

The 4:5 ratio in terms of pixels is nothing but the measure of 1080×1350 pixels in an image of the video.

A colon separates two numbers that represent the width-to-height proportion of an image or video. This proportion or ratio is referred to as the aspect ratio. In terms of height and width, it shows how wide the size is. It makes sure the videos or images are presented without stretching or resolution loss.

The resolution in pixels for the aspect ratio 4x5 or 4:5 is 864 x 1080 or 1080 x 1350 pixels. This establishes how many pixels are present in an image's or video's width and height. The most popular pixel ratio is this one.

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The probability of 0 < z < 2.18 is 0.9945, rounded to four decimal places.

1. To find the probability, we first need to calculate the area under the standard normal distribution curve to the left of z = 1.34 and to the right of z = 2.13.

2. To do this, we can use the graphing calculator to plot the standard normal distribution curve.

3. Then, we can calculate the area under the curve to the left of z = 1.34 by subtracting the area under the curve to the left of z = 2.13 from the total area under the curve.

4. Finally, we can round the answer to four decimal places to get the probability of 0.9945.

The probability of 0 < z < 2.18 is 0.9945, rounded to four decimal places.

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The expression's coefficients have values of 3 and -5, and the constant term has a value of 2.

The formula is 0 = 2 + 3x² - 5x.

We obtain = 3x² - 5x + 2 = 0 by arranging the equation in the form of the general equation ax2 + bx + c = 0.

The leading coefficient is a, the intermediate term's coefficient is b, and the constant term is c.

We may locate the equation's roots or the parabola's vertex by knowing the values of a, b, and c.

After comparing the equation to the general equation, the coefficient and constant term values are as follows.

A = 3

B = -5

C = 2

So, now both the polynomial and the coefficients are available.

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The range of a function is the set of all possible outputs (y-values) for a given input (x-value).

Given the function f(x) = [x+3]-5, we can see that the function first adds 3 to x and then subtracts 5. The square bracket notation around (x+3) indicates that the function is taking the greatest integer less than or equal to (x+3).

For any input x, the output of the function will always be the greatest integer less than or equal to (x+3) - 5. Therefore, the output of the function is always an integer less than or equal to -2.

So the range of the function is [-5, -2] U (-2, ∞)

Option A) [-5,∞) is incorrect as the range starts with -5 but the function output is always less than or equal to -2.

Option B) (-5,∞) is incorrect as the function output is always less than or equal to -2.

Option C) [3,∞) is incorrect as the function output is always less than or equal to -2.

Option D) (3,∞) is incorrect as the function output is always less than or equal to -2.

The correct answer is (-2, ∞)

The slope of line y  = 10 is zero.

We know that the slope of a line is nothing but the change in y coordinate with respect to the change in x coordinate.

It describes the steepness of a line.

The slope of x - axis.

m = 0

As for x-axis the change in y-coordinate is zero.

So, by definition of slope,

m = 0/(change in x coordinate)

m = 0

We know that the slopes of parallel lines are equal.

A line y = 10 is parallel to x-axis

So, the slope of line y = 10 is zero.

i.e., the line y = 10 has zero steepness.

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Answer:

1 inch

Step-by-step explanation:

It's 1 inch because you minus 20 inch by 19 inch and get 1 inch

Answer:1280

Step-by-step explanation:

75% of something is 960 you can use trial and error to find the amount by just doing 75% of a number a little higher than what you got

Answer:

I think it's (4,4) but I could be wrong

Step-by-step explanation:

Light and emotional variables are affected by eye dilation. Under typical conditions, pupils are meant to dilate as a result of changes in lighting and psychological factors.

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Note that the line is a horizontal line, passing through the point (0, 1) in the y-axis.

All points of this line have 1 as their y-coordinate. That is, this line contains points like (-3, 1), (-1, 1), (5, 1), (17, 1)... etc.

Thus, this is the line where y is always 1, this is the line y=1.

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Each and every point along this line has a y-coordinate of 1. This line has points like (-3, 1), (-1, 1), and (5, 1), for example (17, 1).

The formula for these lines is y = mx + b, where m denotes the slope and b the y-intercept.

A sleeping line is a line that is horizontal. From left to right or right to left, it is a straight line. The word "horizon," which refers to the line where it appears that the earth and sky are meeting in the distance, is the ancestor of the word "horizontal." A horizontal line is a straight line that is perpendicular to the x-axis and contains points with identical y-coordinates throughout.

Vertical lines are straight lines that are mapped from top to bottom, whereas horizontal lines are straight lines that are mapped from left to right. In coordinate geometry, the horizontal line is the line parallel to the x-axis, while the vertical line is the line parallel to the y-axis.

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Answer: 5 or -5

Step-by-step explanation:

Since a^2+b^2=c^2 is the Pythagorean theorem, you need to plug in a=3 and b=4 into the equation. 3^2+4^2=c^2. Simplify the left side of the equation first. 3^2 is 9 and 4^2 is 16. 9+16=25. So, 25=c^2. Take the root of this and the square root of 25 is -5 or 5 interchangeably.

Answer: 2/5, 4/5, -4/5, 8/5, -16/5

I dunno that's what I got I could be wrong

Brayden's total earning by walking lap around a track is $35, if he walks 2+1/2 = 5/2 laps per day for 7 days.

Per day walking of brayden = 5/2 laps

7 days walking of brayden = 5/2 × 7 = 35/2 laps

As per the question statement he earns $1 per lap if he walk less than 16 laps and $2 per lap if hi walks 16 or more lap. Since the total walking of brayden is more than 16 laps, so he will earn at the rate of $2 per lap. So total earning will be,

= 2× 35/2

= $35

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The solution to this ¾ divided by 4 is 0.1875.

To visualize the question we are trying to solve, let's put 3/4 and 4 side-by-side so it's easier to see:

3/4÷4

The numbers in 3/4 divided by 4 are labeled below:

3 = numerator

4 = denominator

4 = whole number

All we need to do here is keep the numerator exactly the same (3) and multiply the denominator by the whole number:

3/4 x4= 3/16.

Once you have your final fraction, just divide the numerator by the denominator to get your answer in decimal form:

3/16=0.1875

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So, the probability that the two biscuits are not the same type is 0.15 or 15%.

To find the probability that the two biscuits are not the same type, we need to calculate the probability that Sue takes one biscuit of each type.

First, we will calculate the probability that Sue takes one plain biscuit, one chocolate biscuit, and one currant biscuit.

The probability of Sue taking one plain biscuit is 12/20, since there are 12 plain biscuits out of a total of 20.

The probability of Sue taking one chocolate biscuit after taking a plain biscuit is 5/19, since there are now 5 chocolate biscuits out of 19 remaining.

The probability of Sue taking one currant biscuit after taking a plain and chocolate biscuit is 3/18, since there are now 3 currant biscuits out of 18 remaining.

To find the overall probability that Sue takes one biscuit of each type, we multiply the individual probabilities together:

P = (12/20) * (5/19) * (3/18) = 0.15

So, the probability that the two biscuits are not the same type is 0.15 or 15%.

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The reflection in the line y = x, followed by a reflection in the x-axis transformation that maps the preimage to the image.

What is the transformation?

Transformations are changes done in the shapes on a coordinate plane by rotation, reflection, or translation. A function, f, that maps to itself are called the transformation, i.e., f: X → X. The pre-image X becomes the image X after the transformation. This transformation can be any or combination of operations like translation, rotation, reflection, and dilation.

In geometry, transformation involves changing the position and/or size of a shape.

The transformation that maps the pre-image to the image is dilation

From the given diagram

We can see that the size of and are not the same.

When the No change in size or shape or orientation and Flips the pre-image and produces the mirror-image, then the transformation type is Reflection.

Hence, the reflection in the line y = x, followed by a reflection in the x-axis transformation that maps the preimage to the image.

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Answer:

4 (8+r)

Step-by-step explanation:

Answer:

Use direct variation method of mathematics

ΔABC is the required triangle in which AB = 4 cm, BC = 7 cm and AC = 5 cm.

To see the attachment.

Now, According to the question:

Let us assume that given sides are :

BC = 7 cm, AB = 4 cm and AC = 5 cm

Steps of construction

Step I Draw a line BC = 7 cm.

Step II With center B and radius 4 cm draw an arc.

Step III With center C and radius 5 cm, draw an arc which cuts the previous arc at A.

Step IV Join AB and AC.

Hence, ΔABC is the required triangle in which AB = 4 cm, BC = 7 cm and AC = 5 cm.

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The value of x in the given equation x² = 9 is x = ± 3.

In x² = 9, we need to remove the power of 2 in order to separate just x.

This implies finding the square root √x² which is equal to x.

However, there are 2 possible answers to any square root, a positive or a negative answer.

x = √9

x = ± 3

0r we can solve this equation by the splitting method.

Rearrange the equation

x² = 9

(x - 3)(x + 3) = 0

On solving, we get

x = +3 and x = -3

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The 4 (four) quadrants in order are: Quadrant I, Quadrant II, Quadrant III, and Quadrant IV.

A coordinate plane is divided into four sections called quadrants. These quadrants are numbered I, II, III, and IV in a counterclockwise direction, starting with the top right.

Quadrant I is the top right section of the coordinate plane, and it contains all the points where the x-coordinate and y-coordinate are positive.

Quadrant II is the top left section of the coordinate plane, and it contains all the points where the x-coordinate is negative and the y-coordinate is positive.

Quadrant III is the bottom left section of the coordinate plane, and it contains all the points where the x-coordinate and y-coordinate are negative.

Quadrant IV is the bottom right section of the coordinate plane, and it contains all the points where the x-coordinate is positive and the y-coordinate is negative.

Understanding this concept is important for solving mathematical problems, especially in algebra and geometry.

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There are two triangles, triangle abc and triangle def. Side ab is congruent to side de, side ac is congruent to side df. Angle cab is congruent to angle fde. The length of the side bc is (x-4).  The value of x is 23.

The value of x can be calculate as follows:

Given that the triangles are congruent and moreover

Considering that

AB = DE

AC = DF

so,

The third will be compatible as well.

so,

BC = AE

x - 4 = 19

x = 19 + 4

x = 23

Therefore , the value of x is 23. When there are two triangles, triangle abc and triangle def. Side ab is congruent to side de, side ac is congruent to side df. Angle cab is congruent to angle fde. The length of the side bc is (x-4).

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When we multiply any number by zero, the outcome is always a zero, according to the definition of the zero property of multiplication, examples as 8 x 0 = 0.

When we multiply any number by zero, the end result is always a zero, according to the definition of the zero property of multiplication. Zero need not always be the first or second number. When multiplied by another number, it could be anywhere. This indicates that the outcome of the multiplication is unaffected by the placement of the digit zero.

All different kinds of numbers fall under the umbrella of this property. They could be fractional, decimal, or integer numbers. Thus, the results of some such numbers will be as follows:

10 x 0 = 0         6.4 x 0 = 0

½ x 0 = 0         1 x 2 x 3  = 0

A non-example of property 0 is: 5 × 1 = 5, the number is not multiplied by 0, therefore, it does not denote the zero property of multiplication.

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Compete question is: Give non-example of the property 0.

Answer:3/8 was left over

Step-by-step explanation: 3/8 plus 1/4 x 2 equals  5/8... remainder 3/8

Answer:

3/8 (this is the answer)