What is the answer to this

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

We have enough material to build a fence around a station that has a perimeter of 180 feet the width of the rectangular space must be 3 1/4 feet what must the length be

A50% increase followed by 33 1/2% decrease