Its formula manipulation, only respond if u know how to get the answer, you

Problem 1:

Problem 2:

Problem 3:

The radius is cm.

Problem 4:

The width is 15 cm.

Step-by-step explanation:

Problem 1:

We want to solve for .

Multiply both sides by 3:

Rearrange the multiplication using commutative property:

We want to get by itself so divide both sides by what is being multiplied by which is .

Problem 2:

We want to solve for in .

Multiply both sides by 3:

We want by itself so divide both sides by what is being multiply by; that is divide both sides by .

Problem 3:

The circumference formula for a circle is . We are asked to solve for the radius when the circumference is cm.

Divide both sides by what r is being multiply by; that is divide both sides by :

Reduce fraction:

The radius is cm.

Problem 4:  

The perimeter of a rectangle is where is the width and is the length.

We are asked to find w, the width, for when L, the length, is 5, and the perimeter is 40.

So we have this equation to solve for w:

Simplify the 2(5) part:

Subtract both sides by 10:

Divide both sides by 2:

Simplify the fraction:

The width is 15 cm.

idk

step-by-step explanation:

i don't know

a is the correct