These tables of values represent continuous functions. In which table do the values represent an exponential function?

If 25% of y is 30, what is 60% of y?

What is the distance between point a and b

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?