Final answer:
The input of the function f(x) = 7x - 32 when given f(x) = 20 is approximately 7.43. This is found by replacing f(x) with 20 and solving for x.
Step-by-step explanation:
The student asks for the input of the function f(x) = 7x - 32 when f(x) = 20. To find this, we replace f(x) with 20 in the equation and then solve for x:
20 = 7x - 32
By adding 32 to both sides:
20 + 32 = 7x
52 = 7x
And then dividing both sides by 7:
x = 52 / 7
x ≈ 7.43
Thus, the input x is approximately 7.43 when f(x) = 20.