Question 3 O pts
Part 3
1. The image shows the battery usage of a cell phone 9 hours since it was fully charged.
It also shows a prediction that the battery would last 8 more hours.
a) Write an equation for a model that fits the data in the image and gives
Advanced battery usage
the percent of battery power, p, as a function of time since the phone
was fully charged, t. Show your reasoning.
52%
If you get stuck, consider creating a table of values or a scatter plot of the
100%
data.
50%
096
b) Based on your function, what percentage of power would the battery
have 4 hours after this image was taken? What about 5 hours after the
image was taken? Show your reasoning.
9 hr ago
8 hr left
2. Here are two more images showing the battery usage at two later times, before the battery was
charged again.
+ Advanced battery usage
+ Advanced battery usage
29%
7%
100%
100%
50%
50%
0%
0%
14 hr ago
29 min left
13 hr ago
4 hr left
a) How well did the function you wrote predict the battery power 4 and 5 hours since the first image
was taken (that is, 13 and 14 hours after the battery was fully charged)? Explain or show your reasoning.
b) What do you notice about the change in the prediction between t=13 and t=14?