Question

The area of a circle is approximately 3.14 times the radius squared. Which of the following expressions is a correct way to write this, if the radius is 3x?

Answer 1

The area (lets say 'A' is = to 3.14 times the radius squared ...so

\[A = 3.14 r^2\]

If the radius is 3x we have

\[A = 3.14 (3x)^2\]

Which would then simplify to

\[A = 3.14 \times 9x^2\]

Answer 2

These are the answers

3.14(3x)2

(3x)(3.14)2

3.14(3)x2

9(3.14)x

That i get to choose from

Answer 3

So then it's the one I wrote BEFORE that simplification...

3.14(3x)^2

So A in your case