7th Mid-Topic Review

Vocabulary What is the variable in the expression 21 - 3x?

Vocabulary: What is the coefficient of the term 42xy?

Vocabulary: What is the constant in the expression 24h + 91?

Which expression is equivalent to 4a + (−6b) − 3a + 2b?

• a + 4b

• a − 4b

• 7a − 8b

• 7a − 4b

Which expression is equivalent to 2.1 + (−3.7h) + 1.9h − 1.4?

• 3.5 − 5.6h

• 4.9h

• 0.7 + 1.8h

• 0.7 − 1.8h

Select all of the situations which can be represented by the expression 25.75x + 10.

• Carol has $25.75. She earns $10.00 for each car that she washes.

• Max has $10.00. He earns $25.75 for every lawn that he mows.

• Jin buys x postcards for $25.75 each and x keychains for $10.00 each.

• Sasha sells a scarf for $10.00 and x jackets for $25.75 each.

• Jon buys 10 toy cars for $25.75 each.

Leon has a container filled with 450 grams of tea leaves. Each morning, he uses 3 grams to make a cup of tea. Write an expression to represent the amount of tea leaves remaining after "x" days.

​ (a)   -​ (b)  

• 450
• 3x
• 447x
• 450x
• 3

As a Christmas special, a phone company is going to charge $100 plus $25 for each iPhone purchased. Write an expression for purchasing “p” phones.

Write the expanded form of 4(3a - 2b - 6) using the Distributive Property.

Write the expression equivalent to 2(6x + 4y) - 2y by simplifying and combining like terms.