X = 4
Explanation:
sqrt(x) + sqrt(5 + x) = 15 / sqrt(5 + x)
sqrt(5 + x)[sqrt(x) + sqrt(5 + x)] = 15
sqrt(5x + x^2) + 5 + x = 15
sqrt(5x + x^2) = 10 - x
Take square of both sides
5x + x^2 = (10 - x)^2
5x + x^2 = 100 - 20x + x^2
Cancel x^2
5x = 100 - 20x
25x = 100
x = 4
Y= the number riders over time
x= hours into Tara's shift
y= 33x + 132
Check the picture below
is a right-triangle, and you can pretty much see how long "y" and "x" are.
make sure your calculator is in Degree mode.
The answer to the question is A. 5x