Find the surface area ASAP and plz show your work

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

Candy lives in the center of town. her friend darlene lives 28 miles to the east and her friend dana lives 21 miles north. approximately how far do dana and darline live apart ?

What is the slope of the line that passes through the points (–9, 2) and (0, 4)? the slope of the line is