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

For the given quadratic equation convert into vertex form, find the vertex and find the value for x=6 y=-2x^2+2x+2

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

What is a rational number between 9.5 and 9.7