Evaluate and Write Expressions with Variables

math phrase that combines numbers AND variables (letters: 3b or 5x) by using (+, -, *, ÷). *does not have an equal sign (=)

• algebraic expression

• equivalent expressions

• reduce

• substitution

• ratio

replacing a variable with a number or expression

• equivalent fractions

• substitution

• evaluate

• equivalent expressions

• similar figures

a letter that represents an unknown value

• evaluate

• equivalent ratios

• variable

• substitution

• expression

Use the distributive property to find an equivalent expression: 5(2f + 4)

• 10f + 4

• 10f + 9

• 10f + 20

• 30f

• 15

• 25

• 75

• 5

a² - b²
Evaluate if a=4 and b =2

• 4

• 20

• -4

• 12

Evaluate when a = 15:
2(a - 5) + 2

• 22

• 27

• 14

• 7

A rectangle has a dimension that is represented by (2c + 1) and another dimension that is (3 + c). If c = 3, then that is the actual area of this rectangle?

• 13 square units

• 42 square units

• 36 square units

• 12 square units

Rachel bought "s" pairs of socks.  Steven bought 6 pairs of socks.  Emma bought twice as many socks as both Rachel and Steven.  Which expression represents how many socks Emma bought? 

• s + 6

• 2s + 6s

• 2(s + 6)

• s + 12

The length of a rectangle is represented by (5x - 3) and the width is (x + 3). If x = 2, then which of the following values is the actual perimeter of this rectangle?

• 18

• 14

• 24

• 20