Use for questions 7-9: Mischa recorded
the battery life of her laptop each hour
after unplugging it.
Battery Life (%)
90
70
50
30
10
1 2 3
Hours
4 5
7. Find the rate of change after the first two
hours of use after unplugging her laptop.
8. Find the rate of change from two hours of
use to two hours and 30 minutes of use.
9. Find the rate of change from three hours
and 30 minutes of use to five hours of use.
O Gina Wilson (All Things Algebra, LLC