Which table represents a quadratic function?

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

What is the frequency of the sinusoidal graph?

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?