Sarah works at a concession stand for 2 hours show earn $15.50 but if she works for 4 hours she learned $31 find the rate of change?

The is no change of rate because in both scenarios, she earns 7.75 the hour. So the answer is none.

the answer is 0.3175 hope that you ^w^

also you might actually want to put this picture up if you want people to solve it luckily i remember this question