Lololololol. I long since forgot how to do this. rip
For this case, the first thing we must do is define a variable.
We have then:
p: rate in miles per hour for the last 1.5 hours
We now write the equation that models the problem.
We have then:

Rewriting we have:

From here, we clear the value of p.
We have then:
Answer:
DeAngelo's rate for the last 1.5 hours of his run is 7 miles per hour.
Answer:
The area of the Figure ABCDE is <u>26.5</u> square units.
Step-by-step explanation:
Triangle ABC + ACD + AED = Figure ABCDE
7.95 + 9.8 + 8.75 = 26.5 square units