Is -5.0 a integer or is i something else

The graph below could be the graph of which exponential function?

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?

What is the perimeter of a rectangle if the length is 5 and the width is x?