Variable in Expressions

Name the variable: 20 - 2x

• 20

• 2

• x

• a

8 + n, if n = 7

• 56

• 8

• 15 

• 1

5g, if g = 4

• 20

• 9 

• 5

• 1

65 - y, if y = 23 

• 88

• 3

• 42

• 32

A variable is a letter or symbol used to represent an unknown number.

• True

• False

Valerie has 'x' dollars. She spends $4 on lunch, but then she finds a $5 bill on the ground. Write a mathematical statement to express how many dollars Valerie has now.

• x-4+5

• 4x5+x

• 5-4-x

• x-4-5

Match the following vocabulary words to it's correct definition.

• Variable

• A placeholder, usually a letter, to represent an unknown number.

• Expression

• A combination of terms.

• Term

• A number, a variable, or both.

• Coefficient

• The number in front of the variable.

• Constant

• A number by itself with no variable attached.

Tags

6.13

Evaluate the expression for the given value of the variable:
3h+2 for h=10

• 20

• 32

• 24

• 38

Evaluate the expression for the given value of the variable:
2x³ for x=3

• 60

• 56

• 48

• 54

The product of 5 and q

• 5 + q

• 5 - q

• 5q