7 Variables and Expressions

Write a variable expression to represent the phrase: The product of 72 and some number y.

• 72 + y

• 72 - y

• 72y

Which of the following is an example of an expression?

• 5 + y

• 3 = x

• 5c + 6 = 11

Evaluate the expression when x = 2 and y = 4:

3x - y

• 24

• 2

• 28

• 10

• 0

• 11

• -5

• -12

Evaluate the expression when x = 10.

x + 7

• 10

• 3

• 1

• 17

Write a variable expression to represent the following phrase:

The difference of a number and 1

• 1 - x

• x - 1

• 1x

• -1x

Evaluate the Expression if p = 7

17 - p

• 24

• -10

• 10

• -7

Evaluate the expression if a = 3 and b = 4.

ab ÷ 3

• 11
• 4
• 3
• 1

Evaluate the expression if a = 3 and b = 4.

2a + 8

• 31
• 14
• 16
• 12

Evaluate when x = 2 and y = 5:
2 + (12 - 5x) ⋅ 2y

• 22
• 40
• 142
• -86