Answer: x = 20
Step-by-step explanation:
We can use the pythagorean theorem:
x^2 + 15^2 = 25^2
x^2 + 225 = 625
We can subtract 225 from both sides:
x^2 = 400
We can take the square root of both sides:
x = 20.
The rate of change is 7 because its 7 miles per hour
20(-1.5r + 0.75)
= 20*-1.5r + 20*0.75
= -30r + 15 answer
D
a direct linear variation equation has the form f(x) = kx
f(x) = x - 12 is not in this form thus does not show a direct linear variation
