The perimeter of a semicircle, P, is given by P=π r+2r. If Janice knows the perimeter of her semicircular window, how could she rearrange the formula to find the radius of the window?
A. r= px/2
B. r= p/x+2
C. r= p/x - 2r/x
D. There is no way to rearrange the formula in terms of the radius, because it is in multiple terms. Scientific Calculator