Sol 5.19 Expressions

Francis had $20 to go shopping. She bought a shirt for a certain amount of money, m, and has $5 left. What equation correctly describes the situation?

• m + 20 = 5

• 20 - m = 5

• m + 5 = 20

• 5 - m = 20

What does a variable represent in an algebraic expression?

• constant

• unknown number

• known number

• function

Which represents the unknown value in the following statement? 
7 + j = 15

• 7
• +
• j
• 12

What is the variable in the expression 16r - 3

• 16

• r

• -

• 3

In the expression i + 4, the letter i represents

• a number sentence

• an open sentence

• an addition symbol

• an unknown number

In the expression 77x - 60, the letter x represents 

• a variable

• a known number

• an expression

• a number sentence

Match the word problem with the expression:
Each day of the week I work the same number of hours.

• 7y

• y + 7x

• 7 ÷ y

Which is the variable in the expression 6c ÷ 4 ?

• c

• ÷

• 4

• 6

In the expression m - 5, the letter m represents —

• a subtraction symbol

• a number sentence

• an addition symbol

• an unknown number

In the expression p × 7, the letter p represents —

• a subtraction symbol

• a multiplication symbol

• a number sentence

• a variable