Fun with Functions: Expressions and Equations in Action

If a function takes a number and adds 5 to it, what is the output when the input is 3? Write an equation to represent this.

• 10

• 8

• 3

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A function multiplies an input by 4. If the input is represented by x, write the expression for the output.

• x - 4

• 4 * x

• 4 + x

• x * 4

Maria has a function that subtracts 2 from her age. If she is currently 10 years old, what is the output of the function?

• 12

• 8

• 6

• 10

The function f(x) = x + 7 represents the number of candies Sam has after he buys x candies. If Sam buys 5 candies, how many does he have now?

• 10

• 15

• 8

• 12

A function doubles the input number. If the input is represented by y, write the expression for the output when y is 6.

• 12

• 14

• 8

• 10

If a function takes a number and divides it by 3, what is the output when the input is 12? Write an equation to show this.

• 2

• 4

• 9

• 6

The function g(x) = 3x - 1 represents the number of books Emily has after she donates x books. If she donates 4 books, how many does she have left?

• 10

• 15

• 11

• 7

A function adds 10 to the input number. If the input is represented by z, write the expression for the output when z is 8.

• 18

• 20

• 12

• 16

If a function takes an input and subtracts 4, what is the output when the input is 15? Write an equation to represent this.

• 12

• 10

• 11

• 14

The function h(x) = x/2 represents the number of slices of pizza each person gets if x slices are shared among 4 people. If there are 16 slices, how many does each person get?

• 8

• 6

• 2

• 4