### Home > CC4 > Chapter 8 > Lesson 8.1.4 > Problem8-59

8-59.
1. Jeffe and Tomas collected the following data for a bouncing basketball. What is their rebound ratio as a percent? Write a model for their data and then sketch a graph of the situation. Homework Help ✎

2.  Bounce number (x) 1 2 3 4 Height, cm (y) 80 64 51 41

Look at the ratios of the successive y-values.

$\frac{64}{80}=0.8 \ \ \ \ \frac{51}{64}\approx 0.8$

Use the general form of an exponential equation: y = a•bx. The parameter, b, is the constant ratio, 0.8.
To find the a-value, find the 0th term.

To find the 0th term, divide the first term, 80, by 0.8