If f(x)=2x^2-3x, what is the value of f(5)?

In this example, all you have to do is plug in 5 wherever you see x

For example: f(5) = 2(5)^2 - 3(5)

Work out the equation and you get f(5) = 2(25) - 15, keep going and you are left with f(5) = 50 - 15

Answer f(5) = 35

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50

answer: 42

use a calculator to find that 845/73 = 11.575

the whole part of the answer is 11. multiply this by 73 to get 11*73 = 803.

subtract that result from 845 to get 845 - 803 = 42