The function f(r) gives the area of a circle with radius r it can be written in equation form f(r)=3.14r^2 what is f(5) a) 78.50 b) 31.40 c) 28.14 d) 246.49

f(r)=3.14r^2

f(5)=3.14(5)^2 = 3.14 x 25 = 78.5

answer
A) 78.50

Answer: the correct answer is 10step-by-step explanation: let the number be n, then the expression becomes,then“twelve more than the quotient of a number and two, decreased by four” iswhen n=4,we substitute 4 whetever we see n to get,we simplify to obtain,we further simplify to get,therefore the correct answer is c.