the output is four times the difference of the input and 5

Answer 1

f(x) = 4(x-5)

Answer 2

Naj, Since you are asked to write a function rule, we will use function notation. f(x) is the output, and x is the input.

output is four times (the difference of input and 5)

f(x) = 4 • (x - 5)

If you want to further simplify, you could distribute the 4:

f(x) = 4x - 20.