Input and Output of Function

If my function rule is x + 3, what is the OUTPUT if the input is 4?

• 4
• 3
• 7
• 10

If my function rule is 4x, what is the OUTPUT if the input is 5?

• 45
• 54
• 9
• 20

If my function rule is 2x + 1, what is the OUTPUT if the input is 2?

• 5
• 4
• 22
• 23

If my function rule is x - 5, what is the OUTPUT if the input is 14?

• 9
• 19
• 21
• 1

If my function rule is  x÷3, what is the OUTPUT if the input is 12?

• 9
• 4
• 3
• 36

If f(a) = 3 - 2a Find f(-3).

• 12
• -2
• -3
• 9