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2 years ago

3(8+7) = and how to solve it

2 answers:

fomenos2 years ago

7 0

Answer: 45

Use PEMDAS

first do what in the parentheses

(8+7)

8 + 7 = 15

Now we have

3(15)

This is multiplication

3 x 15 = 45

USPshnik [31]2 years ago

5 0

Hello there! :)

3(8+7)

First, do the operation inside the parentheses:

3(15)

Multiply:

Let's try another way. Use the Distributive Property to distribute 3:

24+21=45

So the answer is 45. Hope this helps you! :)

~Just a joyful teen

$SilentNature$

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gladu [14]

It is congruent because the two shapes have the same length.

7 0

3 years ago

Sovle for h: v=1/3πr²h

erastovalidia [21]

Answer:

Step-by-step explanation:

$v = \frac{1}{3} \pi {r}^{2} h$

To solve for h multiply through by 3 to eliminate the fraction

That's

$3v = \pi {r}^{2} h$

Divide both sides by πr² to make h stand alone

$\frac{\pi {r}^{2} h}{\pi {r}^{2} } = \frac{3v}{\pi {r}^{2} }$

We have the final answer as

$h = \frac{3v}{\pi {r}^{2} }$

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8 0

2 years ago

The ceiling of Stacy's living room is a square that is 25 ft long on each side. Stacy

Brut [27]

Answer:

A. 35 ft.

B. 35 ft

Step-by-step explanation:

Please see attached photo for diagram.

A. Determination of the diagonal using pythagorean theorem.

A square has all sides equal. Thus, the diagonal of the square can be obtained as follow:

Ist leg (L₁) = 25 ft

2nd leg (L₂) = 25 ft

Diagonal (d) =?

d² = L₁² + L₂²

d² = 25² + 25²

d² = 625 + 625

d² = 1250

Take the square root of both side

d = √1250

d = 35 ft

B. Determination of the diagonal using trigonometry.

Since all the sides in a square are equal, the angle between each leg will be 90°. Thus, the diagonal will bisect the angle between the two leg equally i.e

Angle between Diagonal and each leg = 90/2 = 45°

Finally, we shall determine the length of the diagonal. This can be obtained as follow:

Angle θ = 45°

Opposite = 25 ft

Hypothenus = d

Sine θ = Opposite / Hypothenus

Sine 45 = 25 / d

0.7071 = 25 / d

Cross multiply

0.7071 × d = 25

Divide both side by 0.7071

d = 25 / 0.7071

d = 35 ft

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3 years ago

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Aleonysh [2.5K]

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