Answer:

Step-by-step explanation:
The function is given :
f(x) = 4x + 15
For f(-3), the input for the function f(x) is -3.
Replace the x variable with -3.
f(-3) = 4(-3) + 15
Evaluate.
f(-3) = -12 + 15
f(-3) = 3
The output for f(-3) is 3.
If area equals length times width then 750=5 x y but that doesnt seem to be there, so i would say e because it is the closest to it. sorry but hope this helps
Answer:
y=4.5x
Step-by-step explanation:
It's right on Khan Academy:)
H^2=x^2+y^2
9^2=4^2+x^2
81=16+x^2
x^2=65
x=8.1cm