Today's high temperature is 72°F. If yesterday's high temperature was 87°F, what was the change in high temperatures? -15°F 15°F
19 F.
-19°F

15°F

Step-by-step explanation:

It is given that,

Today's high temperature is 72°F and yesterday's high temperature was 87°F. We need to find the change in high temperatures.

Change in temperatures = final temperature - initial temperature

= 87°F - 72°F

= 15°F

It means that the change in temperature is 15°F. Hence, the correct option is (b).

15

Step-by-step explanation:

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50