Function Input and Output Word Problems

What does x stand for in f(x)?

• The input

• The output

• The name of the function

What does f(x) stand for in f(x)?

• The input

• The output

• The name of the function

What does f stand for in f(x)?

• The input

• The output

• The name of the function

If f(x) = 2x + 1, what is the OUTPUT if the input is 2?

• 5

• 4

• 22

• 23

If the function is f(x)=4x, find f(5)

• 45

• 54

• 9

• 20

If f(x) = x - 5, find f(14).

• 9

• 19

• 21

• 1

If f(x) = x/3, find f(12).

• 9

• 4

• 3

• 36

If my function rule is y = x - 4, what is my INPUT if the output is 7?

• 11

• 10

• 3

• 7

If f(x) = x + 8, find x if f(x) = 20

• 10

• 12

• 8

• 28

If my function rule is y = 5x, what is my INPUT if the output is 10?

• 1

• 50

• 2

• 15