Question: let afrafr be the area of a circle of radius...
Let A=f(r)A=f(r) be the area of a circle of radius r.
(a) Write a formula for f(r)=f(r)=
(b) Which expression represents the area of a circle whose
radius is increased by 20%?
(c) By what percent does the area increase if the radius is increased by 20%?
% (round to the nearest 0.01%) help (numbers)