Answer:
15
Step-by-step explanation:
A function as this f(x) = 5x + 40 means where you have x you need to insert the value of x in the equation. The value of x is -5 hence you write
f(-5) = 5(-5) + 40
Open the bracket by doing 5 x -5 which gives -25
so you have -25 + 40 which you can re-arrange as 40 - 25.
40-25 = 15
