Question

worried about going over her storage limit, sophia monitored the number of undeleted voicemail messages stored on her phone each day.
voicemail messages on sophias phone
day voicemail messages
sunday 18
monday 17
tuesday 12
wednesday 17
thursday 16
according to the table, what was the rate of change between sunday and wednesday?
round your answer to the nearest tenth.
voicemail messages per day

Explanation:

Step1: Identify the formula for rate of change

The formula for rate of change is $\frac{y_2 - y_1}{x_2 - x_1}$. Here, $y$ represents the number of voicemail messages and $x$ represents the day. Let Sunday be $x_1 = 0$ (with $y_1=18$) and Wednesday be $x_2 = 3$ (with $y_2 = 17$).

Step2: Substitute the values into the formula

Substitute $x_1 = 0,y_1 = 18,x_2=3,y_2 = 17$ into $\frac{y_2 - y_1}{x_2 - x_1}$. We get $\frac{17 - 18}{3-0}=\frac{- 1}{3}\approx - 0.3$.

Answer:

$-0.3$