Question

worried about going over his storage limit, zane monitored the number of undeleted voicemail messages stored on his phone each day. according to the graph, when was the rate of decrease greater? between wednesday and saturday

Explanation:

Step1: Calculate rate of decrease between Thursday - Friday

The number of voicemail messages on Thursday is 18 and on Friday is 6. The rate of decrease is calculated as $\frac{\text{Change in number of messages}}{\text{Change in time}}$. The change in number of messages is $18 - 6=12$, and the change in time is $1$ day. So the rate of decrease is $\frac{18 - 6}{1}=12$ messages per day.

Step2: Calculate rate of decrease between Friday - Saturday

The number of voicemail messages on Friday is 6 and on Saturday is 6. The change in number of messages is $6 - 6 = 0$, and the change in time is 1 day. So the rate of decrease is $\frac{6 - 6}{1}=0$ messages per day.

Step3: Compare the rates

Since $12>0$, the rate of decrease is greater between Thursday and Friday.

Answer:

between Thursday and Friday