You find f(5) the same way you evaluate any function. Put the number where the variable is and do the arithmetic.
When high powers are involved, it can simplify the arithmetic a little to do some factoring:
.. f(x) = (-3x^2 +7)*x^2 -2
.. f(5) = (-3*25 +7)*25 -2 = -68*25 -2
.. f(5) = -1702
The volume is the area of the base times the height.
The area of the base is e squared. Times the height, e, would be e cubed.

Hope this helps.
I think it’s x=10? because if that is equal to 110 then 110-30=80 | 8x/80 x=10
For this equation, you simply plug in the number 5 every time you see an n. So T(5)=5-7, which equals -2
To draw a graph of y=2-1/2x the point on the graph starts a 2 then the next point goes down because of the -1/2x so it would subtracting 0.5 from each previous point