If the sides of a cube are 4 inches long, then its volume is a) 64 in b) 64 in2 c) 64 in3 d) 64 in4

Is this a polynomial function? i need to know asap

If a is a nonzero real number then the reciprocal of a is

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?