Question

a restaurants average food preparation time was tracked from day to day as part of an efficiency improvement program. average food preparation time according to the graph, when was the rate of decrease greater? between wednesday and friday between tuesday and thursday

Explanation:

Step1: Calculate rate of decrease between Tuesday and Thursday

The food - preparation time on Tuesday is 30 minutes and on Thursday is 30 minutes. The change in time $\Delta t_1=30 - 30=0$ minutes. The rate of decrease is 0.

Step2: Calculate rate of decrease between Wednesday and Friday

The food - preparation time on Wednesday is 50 minutes and on Friday is 20 minutes. The change in time $\Delta t_2=50 - 20 = 30$ minutes. The time interval is 2 days. The average rate of decrease is $\frac{30}{2}=15$ minutes per day.

Answer:

between Wednesday and Friday