What is the radius of a circle so that the circumference and area are the same?

Plzzz asapppppp what is the inverse of f if f(x)=^3 sqrt x-5

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?

Richard save $32 in march he saved $48 in april and $38 in may then richard spent $113 on a keyboard how much money does richard have left