Question

Write an expression which solves for the radius of an object having the circumference of 30 feet

Answer 1

C=2pi(r)
30=2pi (r)
r=(30)/(2pi)

Answer 2

`circumference=30ft.\\\\circumference=2\pi r\ (r-radius)\\\\2\pi r=30\ \ \ \ /:2\pi\\\\r=(30)/(2\pi)\\\\r=(15)/(\pi)\ (ft)\\\\(15)/(\pi)\approx(15)/(3.14)\approx4.78\ (ft)`