100 Points! Algebra question. Photo attached. Solve the equation. Please show as much work as possible. Thank you!

Answer:

  (b)  $42.79

Step-by-step explanation:

You want the monthly interest charge on a balance of $1834.50 when the annual rate is 27.99%.

The monthly interest rate is the annual rate divided by 12. This means the interest charge is ...

  I = Prt . . . . . interest on P at annual rate r for t years

  I = $1834.50 × 0.2799 × 1/12 ≈ $42.79

Her monthly interest charge will be $42.79.

The number of 1/3 inch cubes required to fill the box is 62.

Volume = length × width × height

Height = 7/3

Length = 10/3

width = 8/3

Hence ,

Volume = 7/3 × 10/3 × 8/3 = 560/27

Size of cube = 1/3

Number of cubes required = Volume of box / size of cube

Number of cubes = 560/27 × 3/1

Number of cubes = 1680/27 = 62.22

Therefore, it will take 62 1/3 cubes to fill the box

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The property used to calculate x in (x + 2)(x + 6) = 0 is (a) the zero product property

From the question, we have the following parameters that can be used in our computation:

(x + 2)(x + 6) = 0

The equation when expanded becomes

x + 2 = 0 or x + 6 = 0

In algebra, the zero product property states that

if ab = 0, then a = 0 or b = 0

using the above as a guide, we have the following:

The property used to calculate x is (a) the zero product property

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The total surface area of the cone is 427.04 square inches.

For a cone of radius R and slant height L, the total surface area is given by the formula:

S = π*R*L + π*R²

Where π = 3.14

In this case, we know that the radius of the cone is 8 inches, and the slant height of the cone is 9 inches.

Then the total surface area of the cone is:

S = 3.14*8in*9in + 3.14*(8in)²

S = 427.04 in²

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Answer:

13 glue sticks cost $25.22.

Step-by-step explanation:

4 blue sticks cost $7.76, this means that one glue stick costs

$7.76/4 = $1.94.

Let  be the cost of the glue sticks, and  be the number of glue sticks; then

We can use this equation to find the cost of 13 glue sticks; we just put  into our equation and it gives:

So 13 glue sticks cost $25.22.

The domain of function f(x) is given as follows:

{x | 1 ≤ x < 5}.

The values of x of the function given at the end of the answer are as follows:

Hence the domain is given as follows:

{x | 1 ≤ x < 5}.

The function is given by the image presented at the end of the answer.

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Answer:

A - {x | 1 < x < 5}

Step-by-step explanation:

took the Quiz

Answer:

p/64 <= 230

Step-by-step explanation:

The inequality that represents Angel's situation is:

p/64 <= 230

This inequality states that the number of boxes of candy bars, represented by p, divided by 64 (the cost of each box), is less than or equal to 230 (the maximum amount Angel has to spend on the order).

The Free Cash Flow based on the information given will be $115,000

Statement of Cash Flows for Stand Corp for the year ended December 31, 2022

Cash flows from operating activities:

Net income $160,000

Adjustments to reconcile net income to net cash provided by operating activities:

Depreciation expense $17,000

Loss on sale of investments $10,000

Changes in current assets and liabilities:

Increase in accounts receivable ($5,000)

Increase in inventory ($20,000)

Increase in accounts payable $17,000

Increase in accrued expenses $11,000

Net cash provided by operating activities $190,000

Cash flows from investing activities:

Sale of investments $52,000

Purchase of equipment ($75,000)

Net cash used in investing activities ($23,000)

Cash flows from financing activities:

Payment of cash dividends ($25,000)

Net cash used in financing activities ($25,000)

Net increase in cash $142,000

Cash at beginning of year $78,000

Cash at end of year $220,000

Free Cash Flow = Net cash provided by operating activities - Purchase of equipment

Free Cash Flow = $190,000 - $75,000

Free Cash Flow = $115,000

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The correct step to prove that [tex]BC^2 = AB^2 + AC^2[/tex] is:

By the cross product property, [tex]AC^2 = BC \cdot AD[/tex].

To prove that [tex]BC^2 = AB^2 + AC^2[/tex], we can use the triangle similarity and the Pythagorean theorem. Here's a step-by-step explanation:

Given triangle ABC with right angle at A and segment AD perpendicular to segment BC.

By triangle similarity, triangle ABD is similar to triangle ABC. This is because angle A is common, and angle BDA is a right angle (as AD is perpendicular to BC).

Using the proportionality of similar triangles, we can write the following ratio:

[tex]$\frac{AB}{BC} = \frac{AD}{AB}$[/tex]

Cross-multiplying, we get:

[tex]$AB^2 = BC \cdot AD$[/tex]

Similarly, using triangle similarity, triangle ACD is also similar to triangle ABC. This gives us:

[tex]$\frac{AC}{BC} = \frac{AD}{AC}$[/tex]

Cross-multiplying, we have:

[tex]$AC^2 = BC \cdot AD$[/tex]

Now, we can substitute the derived expressions into the original equation:

[tex]$BC^2 = AB^2 + AC^2$\\$BC^2 = (BC \cdot AD) + (BC \cdot AD)$\\$BC^2 = 2 \cdot BC \cdot AD$[/tex]

It was made possible by cross-product property.

Therefore, the correct step to prove that [tex]BC^2 = AB^2 + AC^2[/tex] is:

By the cross product property, [tex]AC^2 = BC \cdot AD[/tex].

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The resulting mixture contains approximately 64.5% alcohol, not 58.6% as you mentioned.

We can calculate the weighted average of the alcohol percentages based on the volumes of each component.

Let's figure out how much alcohol there is overall in the mixture:

Total alcohol is calculated as follows: (Volume of 45% alcohol) * (Property of 45% alcohol) + (Volume of 82% alcohol) * (Property of 82% alcohol) + (Volume of 92% alcohol) * (Property of 92% alcohol).

Total alcohol = (5 liters) * (45%) + (4 liters) * (82%) + (1 liter) * (92%)

Total alcohol = 2.25 liters + 3.28 liters + 0.92 liters

Total alcohol = 6.45 liters

Let's now determine the amount of alcohol included in the final mixture:

Alcohol content is calculated as (total alcohol / total mixture volume) * 100.

The mixture's total volume is  = 5 liters + 4 liters + 1 liter = 10 liters

Alcohol content: (6.45 liters / 10 liters) x 100 = 64.5%

Therefore, the resulting mixture contains approximately 64.5% alcohol, not 58.6% as you mentioned.

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Donna can expect her total monthly housing expenses to be approximately $842.71 for the first month after purchasing the house, assuming no tax benefits or amortization on the loan.

To calculate Donna's monthly housing expenses, we first need to determine the total amount of the mortgage. Since she puts down $25,000 on a $125,000 house, she will need to take out a mortgage for $100,000.

Next, we can calculate the annual cost of owning the house beyond the 5% cost of mortgage interest, which is given as 4.09% of the value of the house. So, 4.09% of $125,000 is:

0.0409 x $125,000 = $5,112.50

This means that Donna can expect to pay approximately $5,112.50 per year in additional expenses associated with owning the house.

To calculate the monthly cost, we simply divide this by 12:

$5,112.50 / 12 = $426.04

So, Donna can expect to pay approximately $426.04 per month in additional expenses associated with owning the house.

Adding the cost of the mortgage interest, we can calculate her total monthly housing expenses as follows:

Total monthly housing expenses = Mortgage interest + Additional annual costs / 12

Mortgage interest = 5% of $100,000 = $5,000 per year or $416.67 per month

Total monthly housing expenses = $416.67 + ($5,112.50 / 12) = $416.67 + $426.04 = $842.71

Hence, Donna can expect her total monthly housing expenses to be approximately $842.71

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The requried, Multiplies(with switching factors.) area given below,

a.

693 x 83 = 57489

83 x 693 = 57489

The answer is 57489.

b.

910 x 45 = 40950

45 x 910 = 40950

The answer is 40950.

c.

38 x 84 = 3192

84 x 38 = 3192

The answer is 3192.

d.

409 x 89 = 36401

89 x 409 = 36401

The answer is 36401.

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Answer:

5

Step-by-step explanation:

Just do as the problem says:

xy-y = (2)(5)-(5) = 10-5 = 5

Answer: 5

Step-by-step explanation: All you have to do is substitute x & y for their respective numbers. In this case, change x for 2 & y for 5, So xy-y becomes 2(5)-5, which equals 10-5, which is 5.

a. The surface area of the cylinder is 120π square units.

b. Assuming the diameter and the height of the cylinder are cut in half, the surface area of the cylinder would be reduced by a scale factor of 1/4.

In Mathematics and Geometry, the surface area (SA) of a cylinder can be calculated by using this mathematical equation (formula):

SA = 2πrh + 2πr²

Where:

Note: Radius = diameter/2 = 8/2 = 4 m.

By substituting the side lengths into the formula for the surface area (SA) of a cylinder, we have the following;

Surface area = 2πrh + 2πr²

Surface area = 2(π)(4)(11) + 2(π)(4²)

Surface area = 120π square units.

Part b.

Assuming the diameter and the height of the cylinder are cut in half, we have:

Surface area = 2(π)(4/2)(11/2) + 2(π)((4/2)²)

Surface area = 2(π)(2)(5.5) + 2(π)(2²)

Surface area = (π)(2)(11) + 2(π)(4)

Surface area = 22π + 8π

Surface area = 30π square units.

Scale factor = 30π/120π

Scale factor = 1/4.

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Note: "The diameter of the cylinder is 8 and the height is 11"

Answer:

a₁₀₀ = 1074

Step-by-step explanation:

the nth term of an arithmetic sequence is

[tex]a_{n}[/tex] = a₁ + (n - 1)d

where a₁ is the first term and d the common difference

given a₃ = 7 and a₁₂ = 106 , then

a₁ + 2d = 7 → (1)

a₁ + 11d = 106 → (2)

solve the equations simultaneously to find a₁ and d

subtract (1) from (2) term by term to eliminate a₁

(a₁ - a₁) + (11d - 2d) = 106 - 7

0 + 9d = 99

9d = 99 ( divide both sides by 9 )

d = 11

substitute d = 11 into (1) and solve for a₁

a₁ + 2(11) = 7

a₁ + 22 = 7 ( subtract 22 from both sides )

a₁ = - 15

Then

a₁₀₀ = - 15 + (99 × 11) = - 15 + 1089 = 1074

Answer:

[tex]\sf 2\sqrt{17}[/tex]

Step-by-step explanation:

To find the distance of a line using distance formula:

The line from point X intersect the line p at (0 , -3).

          ( -2 , 5) ⇒  x₁  = -2 & y₁ = 5

          (0 , -3)  ⇒ x₂ = 0    & y₂ = -3

    [tex]\boxed{\bf Distance = \sqrt{(x_1-x_2)^2 + (y_1-y_2)^2}}[/tex]

                       [tex]\sf = \sqrt{-2-0)^2+(5-[-3])^2}\\\\=\sqrt{(-2-0)^2 + (5+3)^2}\\\\=\sqrt{(-2)^2+(8)^2}\\\\=\sqrt{4+64}\\\\=\sqrt{68}\\\\=\sqrt{2*2*17}\\\\=2\sqrt{17}[/tex]

The  value of function f (α + β) is determined as  (3√3  +  1)/3,  (2√2 - 3)/3.

The value of f (α + β) is calculated by applying the following formula as follows;

The given functions;

for α:  x²  +  y² = 4

y is given as -1, the value of x is calculated as;

x²  +  (-1)² = 4

x²  +  1 = 4

x² = 3

x = √3

α = (√3, - 1)

for β:  x²  +  y² = 1

x is given as ¹/₃, the value of y is calculated as;

(¹/₃)² + y² = 1

¹/₉ + y² = 1

y² = 1 - ¹/₉

y² = ⁸/₉

y = √ (8/9)

y = 2√2/3

β = (¹/₃, 2√2/3)

The  value of function f (α + β) is calculated as;

f(α + β) =  (√3, - 1) + (¹/₃, 2√2/3)

f(α + β) = (3√3  +  1)/3,  (2√2 - 3)/3

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Answer: x=27

Step-by-step explanation:

Assumption the 3's are the bases

[tex]log_{3} 3x +log_{3} 3=5[/tex]              >combine using multiplication log rule (logs with      

                                             same base, that are being added can be  

                                              combined with multiplication)

[tex]log_{3}( 3x)(3) =5\\[/tex]                  >simplify

[tex]log_{3}( 9x) =5\\[/tex]                      >rewrite into exponent form

[tex]3^{5} = 9x[/tex]                             >simplify

243 = 9x

x=27

Answer:

x = 27

Step-by-step explanation:

using the rules of logarithms

• [tex]log_{b}[/tex] b = 1

• [tex]log_{b}[/tex] x = n ⇒ x = [tex]b^{n}[/tex]

then

[tex]log_{3}[/tex] (3x) + [tex]log_{3}[/tex] 3 = 5

[tex]log_{3}[/tex] (3x) + 1 = 5 ( subtract 1 from both sides )

[tex]log_{3}[/tex] (3x) = 4

3x = [tex]3^{4}[/tex] = 81 ( divide both sides by 3 )

x = 27

Answer:

80.4 square units.

Step-by-step explanation:

solution Given:

apothem(a)=5

no of side(n)= 12

Area(A)-?

The area of a regular polygon can be found using the following formula:

[tex]\boxed{\bold{Area =\frac{1}{2}* n * s * a}}[/tex]

where:

In this case, we have:

First, we need to find S.

We can find the length of one side using the following formula:

[tex]\boxed{\bold{s = 2 * a * tan(\frac{\pi}{n})}}[/tex]

substituting value:

[tex]\bold{s = 2 * 5 * tan(\frac{\pi}{12})=2.679}[/tex]   here π is 180°

To find the area substituting value in the above area's formula:

[tex]\bold{Area = \frac{1}{2}* 12 * 2.679 * 5=80.37\: sqaure\: units}[/tex]

in nearest tenth 80.4 square units.

Therefore, the area of the regular polygon is 80.4 square units.

Answer:

80.4 square units (nearest tenth)

Step-by-step explanation:

The given diagram shows a regular dodecagon (12-sided polygon) with an apothem of 5 units.

The apothem of a regular polygon is the distance from the center of the polygon to the midpoint of one of its sides.

We can calculate the side length of a regular polygon given its apothem using the following formula:

[tex]\boxed{\begin{minipage}{5.5cm}\underline{Apothem of a regular polygon}\\\\$a=\dfrac{s}{2 \tan\left(\dfrac{180^{\circ}}{n}\right)}$\\\\where:\\\phantom{ww}$\bullet$ $s$ is the side length.\\ \phantom{ww}$\bullet$ $n$ is the number of sides.\\\end{minipage}}[/tex]

Substitute n = 12 and a = 5 into the equation to create an expression for s:

[tex]5=\dfrac{s}{2 \tan \left(\dfrac{180^{\circ}}{12}\right)}[/tex]

[tex]s=10\tan \left(15^{\circ}\right)[/tex]

Now we can use the standard formula for an area of a regular polygon:

[tex]\boxed{\begin{minipage}{6cm}\underline{Area of a regular polygon}\\\\$A=\dfrac{n\cdot s\cdot a}{2}$\\\\where:\\\phantom{ww}$\bullet$ $n$ is the number of sides.\\ \phantom{ww}$\bullet$ $s$ is the length of one side.\\ \phantom{ww}$\bullet$ $a$ is the apothem.\\\end{minipage}}[/tex]

Substitute the found expression for s, n = 12 and a = 5 into the formula and solve for A:

[tex]A=\dfrac{12 \cdot 10\tan \left(15^{\circ}\right) \cdot 5}{2}[/tex]

[tex]A=\dfrac{600\tan \left(15^{\circ}\right)}{2}[/tex]

[tex]A=300\tan \left(15^{\circ}\right)[/tex]

[tex]A=80.3847577...[/tex]

[tex]A=80.4\; \sf square\;units\;(nearest\;tenth)[/tex]

Therefore, the area of a regular dodecagon with an apothem of 5 units is 80.4 square units, rounded to the nearest tenth.

The surface area of Grace's shipping box is 664 square inches.

We have,

The box can be divided into six rectangles, each of which represents the face of the box.

To find the surface area of the box, we need to find the area of each face and then add them all up.

The top and bottom of the box are both 10 inches by 14 inches, so the area of each of these faces is:

= 10 x 14

= 140 square inches

The sides of the box are both 14 inches by 8 inches, so the area of each of these faces is:

= 14 x 8

= 112 square inches

The front and back of the box are both 8 inches by 10 inches, so the area of each of these faces is:

8 x 10

= 80 square inches

To find the surface area of the whole box, we add up the areas of all six faces:

= 2(140) + 2(112) + 2(80)

= 280 + 224 + 160

= 664 square inches

Therefore,

The surface area of Grace's shipping box is 664 square inches.

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Answer:

1 1/2 miles per hour

Step-by-step explanation:

We can use a ratio to solve

3/4 mile

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

1/2 hour

Double the top and the bottom to get to 1 hour

3/4 * 2  miles

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

1/2 *2 hours

1 1/2 miles

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

1 hours

1 1/2 miles per hour

Answer:1 1/2 mile or 6/4 mile

Step-by-step explanation:

Every half hour he rides 3/4Just multiply 3/4 by 2 which equals 6/4 or 1 1/2.

The samples are {(H, R), (H, W), (H, B), (T, R), (T, W), (T, B)}. Thus, the correct option is D.

Given that:

A coin is tossed.

A spinner has 3 equal sections: Red, White, and Blue.

The samples are groups of clearly specified components. The number of items in a finite set is denoted by a curly bracket.

The total number of samples is calculated as,

Total samples = 2 x 3

Total samples = 6

The samples are {(H, R), (H, W), (H, B), (T, R), (T, W), (T, B)}.

Thus, the correct option is D.

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Answer:

444523.45 square miles

Step-by-step explanation:

By using Heron's formula, we can easily find the area of the triangle formed by Miami, Bermuda, and San Juan, we need to use the lengths of the three sides of the triangle.

Let,

Side a: Distance from Miami to Bermuda = 1042 miles

Side b: Distance from Bermuda to San Juan = 965 miles

Side c: Distance from San Juan to Miami = 1038 miles

Now we can use Heron's formula to find the area of the triangle:

s =[tex]\frac{a+b+c}{2}[/tex]

s = [tex]\frac{1042 + 965 + 1038}{2}=1522.5[/tex] miles

A = [tex]\sqrt{s(s-a)(s-b)(s-c)}[/tex]

A = [tex]\sqrt{1522.5(1522.5-1042)(1522.5-965)(1522.5-1038)}=444523.45[/tex]

Therefore, the area of the triangle formed by Miami, Bermuda, and San Juan is approximately 444523.45 square miles.

Answer:

444,523.45 square miles (2 d.p.)

Step-by-step explanation:

To find the area of a triangle formed by the locations of Miami, Bermuda, and San Juan, use Heron's formula.

[tex]\boxed{\begin{minipage}{8 cm}\underline{Heron's Formula}\\\\$A=\sqrt{s(s-a)(s-b)(s-c)}$\\\\where:\\ \phantom{ww}$\bullet$ $A$ is the area of the triangle. \\ \phantom{ww}$\bullet$ $a, b$ and $c$ are the side lengths of the triangle. \\ \phantom{ww}$\bullet$ $s$ is half the perimeter.\\\end{minipage}}[/tex]

Label the three sides of the triangle as 'a', 'b', and 'c', where 'a' is the distance from Miami to Bermuda (1042 miles), 'b' is the distance from Bermuda to San Juan (965 miles), and 'c' is the distance from San Juan to Miami (1038 miles):

To find the half perimeter, s, half the sum of the three side lengths:

[tex]\implies s=\dfrac{a+b+c}{2}=\dfrac{1042+965+1038}{2}=1522.5[/tex]

Substitute the values of a, b, c and s into Heron's formula and solve for area, A:

[tex]\begin{aligned}A&=\sqrt{s(s-a)(s-b)(s-c)}\\&=\sqrt{1522.5(1522.5-1042)(1522.5-965)(1522.5-1038)}\\&=\sqrt{1522.5(480.5)(557.5)(484.5)}\\&=444523.4468348...\\&=444523.45\; \sf miles^2\;(2\;d.p.)\end{aligned}[/tex]

Therefore, the area of the triangle formed by the three locations is 444,523.45 square miles, to two decimal places.

Answer:

[tex]3 {cos}^{2} x - {sin}^{2} x = 0[/tex]

[tex]3 - 3 {sin}^{2} x - {sin}^{2} x = 0[/tex]

[tex]3 - 4 {sin}^{2} x = 0[/tex]

[tex]4 {sin}^{2} x = 3[/tex]

[tex] {sin}^{2} x = \frac{3}{4} [/tex]

sin(x) = +(1/2)√3

x = π/3 + 2kπ or x = 2π/3 + 2kπ

x = -π/3 + 2kπ or x = -2π/3 + 2kπ

(k is an integer)

The equation of the given sine function is y = 4 × sin((π/5)x) + 2.

The equation of the given sine function can be determined based on the given information. We know that the general form of a sine function is:

y = A × sin(Bx - C) + D,

where A represents the amplitude, B represents the frequency, C represents the phase shift, and D represents the vertical shift.

In this case, we are given the following information:

Amplitude (A) = 4: The amplitude is the distance between the maximum and minimum values of the function. Since the function is reflected over the x-axis, the amplitude is positive 4.

Midline (D) = 2: The midline is the horizontal line around which the graph oscillates. In this case, it is y = 2, indicating a vertical shift of 2 units upwards.

Period = 10: The period is the distance between two consecutive peaks (or troughs) of the function.

Given that there is no phase shift, the phase shift (C) is 0.

From the given information, we can deduce the values of A, B, C, and D to construct the equation.

A = 4 (amplitude)

D = 2 (vertical shift)

C = 0 (no phase shift)

To determine B, we use the formula:

B = 2π / Period

Plugging in the value for Period (10), we can calculate B:

B = 2π / 10 = π / 5

Therefore, the equation of the given sine function is:

y = 4 × sin((π/5)x) + 2.

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The slopes of the lines connecting all the points are distinct. Hence, they form a triangle.

To show that the points (2, 5), (5, 2), and (6, 6) form a triangle, we can calculate the slopes of the lines connecting these points. If the slopes are all distinct, then the points form a triangle.

Let's calculate the slopes:

The slope between (2, 5) and (5, 2):

m₁ = (y₂ - y₁) / (x₂ - x₁)

= (2 - 5) / (5 - 2)

= -3/3

= -1

The slope between (2, 5) and (6, 6):

m₂ = (y₂ - y₁) / (x₂ - x₁)

= (6 - 5) / (6 - 2)

= 1/4

The slope between (5, 2) and (6, 6):

m₃ = (y₂ - y₁) / (x₂ - x₁)

= (6 - 2) / (6 - 5)

= 4/1

= 4

Since the slopes of the lines connecting these points are all distinct (-1, 1/4, and 4), the points (2, 5), (5, 2), and (6, 6) form a triangle.

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Therefore, Jan has taken the wrong slant height, he has taken height, h is a place of slant height, l. That's why he has got the wrong answer.

Given:,

r= d/2

22/2= 11m

Using the Pythagorean theorem, we can find the length:

l =[tex]11\sqrt{5}\\ = 24.6m[/tex]

Therefore, to find the surface area:

SA= 3.14(270.56 + 121)

=[tex]1229.5m^2[/tex]

Therefore, to find the volume:

V= [tex]1/3 \pi.r^2h[/tex]

V= [tex]2786.23m^3[/tex]

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The Complete Question

Jan INCORRECTLY finds the surface area of the cone using the following work. Explain Jan's error and find the correct volume AND surface area of the cone. 22 m SA = = url + ar?

The expression that best reveals the maximum and minimum of the function[tex]f(x) = x^2 - 8x - 4 is (x - 4)^2 - 20.[/tex] Option A

The vertex form of a quadratic function is given by[tex]f(x) = a(x - h)^2 + k[/tex] where (h, k) represents the coordinates of the vertex.

In the given quadratic function [tex]f(x) = x^2 - 8x - 4[/tex], we can rewrite it in the vertex form by completing the square:

[tex]f(x) = (x - 4)^2 - 16 - 4\\f(x) = (x - 4)^2 - 20[/tex]

From this expression, we can see that the vertex of the quadratic function is at the point (4, -20).

The term[tex](x - 4)^2[/tex] tells us that the vertex is at x = 4, and the constant term -20 indicates the y-coordinate of the vertex.

The expression that best reveals the maximum and minimum of the function[tex]f(x) = x^2 - 8x - 4[/tex] is  [tex](x - 4)^2 - 20.[/tex]

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A total of 8 workers are required for a building time of 15 days.

In this problem we find a case of inverse relationship, in which the number of workers (n) is inversely proportional to building time (t), in hours. The situation is represented by following formulas:

n ∝ 1 / t

n = k / t

Where k is the proportionality ratio, which can be eliminated by building the following formula:

n₁ · t₁ = n₂ · t₂

If we know that n₁ = 10, t₁ = 12 and t₂ = 15, then the required number of workers is:

n₂ = n₁ · (t₁ / t₂)

n₂ = 10 · (12 / 15)

n₂ = 10 · (4 / 5)

n₂ = 8

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