Answer:
B.

Explanation:
We are given the formula:

and asked to solve for
. Therefore, we must isolate
on one side of the equation.
and
are both being multiplied by r². The inverse of multiplication is division. Divide both sides of the equation by
.


r is being squared. The inverse of a square is a square root. Take the square root of both sides of the equation.



Therefore, the correct answer is B.
