5.19a Quick Check

In the expression ∆ x 3, the ∆ represents (a)  

• a variable
• the operation of multiplication
• the number three

Match the following:

• n - 20

• eight footballs plus some more

• 8 + f

• twelve toys shared equally

• 12 ÷ t

• pencils increased times two

• 20 - n

• Some notebooks taken from twenty

• p x 2

• twenty less than a number

Sally earns $12.00 for every dog she walks. Last week she earned $60.00. Translated to an equation, this looks like 12x = 60. What does x mean in the equation?

• The amount of money Sally earns for each dog.

• The variable of the equation

• The equal sign/symbol

• The total amount Sally earned last week.

Which word describes the letter "j" in the expression 2 + j?

• The number 2

• The operation of addition

• A variable

• There's no way to tell.

What is the variable in the expression y - 12?

• The variable is y

• The variable is -

• The variable is 6

• There is no way to figure it out.

In the equation 20 - m = 8, the variable is

There are s students participating in a jump rope contest. After 10 students finish jumping rope, there are 8 students left to jump. Choose the equation that matches the words.

• s + 10 = 8

• s - 10 = 8

• s x 10 = 8

• 10 ÷ s = 8

The difference between an EXPRESSION and an EQUATION is...

An​ (a)   ​ (b)   have an equal sign, and an EQUATION ​ (c)   have an ​ (d)   sign.

• DOES
• equal
• EXPRESSION
• DOES NOT

CORRECT ANSEW IS HOW MANY HOURS

• x is the value of $160.

• x is how many hours Michael worked

Which word describes the letter “p” in the expression? 9 x p

• Variable

• Constant

• Coefficient

• Exponent