Evaluate Expressions with Variable and Rational Numbers

A symbol, usually a letter, used to represent a number in mathematical expressions or sentences.

• variable

• equation

• formula

• constant

The numerical factor of a term that contains a variable.

In the expression 5x+4, 5 is one of these.

• coefficient

• variable

• constant

• term

To find the value of an expression.

A letter used to represent a number value in an expression or an equation

• term

• coefficient

• constant

• variable

• 15

• 25

• 75

• 5

Evaluate the expression 16 + 36 ÷ b. For b = 4

• 56

• 25

• 24

• 13

Evaluate 3a² - ab when a = -1 and b = 3.

• 12

• -5

• 6

• 0

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

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