Inverse property is being shown
This is relatively easy because that 25 is a perfect square, whose (square) roots are 5 and -5. x^2-10x+25 = (x - 5)(x - 5). Note how (-5)(-5) = +25, and how -5x - 5x = -10x.
The roots are { (x-5), (x-5) }.
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 age distribution of a population is shown.
a. The probability that a person chosen at random is at least 15 years old is <em><u>1</u></em><em><u>4</u></em><em><u>%</u></em>
b. The probability that a person chosen at random is 25 - 44 years old is <em><u>26%</u></em>