(a) Write a formula for $f(r) =$ help (formulas)

(b) Which expression represents the area of a circle whose radius is increased by 5%?

A. $f(r+0.05)$
B. $0.05 f(r)$
C. $f(r) + 0.05$
D. $f(5+r)$
E. $f(1.05 r)$

(c) By what percent does the area increase if the radius is increased by 5%?
% (round to the nearest 0.01%) help (numbers)