Real World Algebraic Expression

Amount you have spent if you buy a shirt for $20 and jeans for x dollars

• 20-x

• 20+x

• x-20

• 20x

Which expression shows how many pieces of Laffy Taffy my 4 friends and I each get?

• f/4

• 4f

• f/5

• 5f

Johnny is x years old. Thomas is 3 times as old as she is. Jenny is 5 years older than Alexis.

Find Alexis' age in terms of x.

• (x-5) years old

• 3x years old

• (3x-5) years old

• x years old

Johnny is x years old. Thomas is 3 times as old as she is. Jenny is 5 years older than Alexis.

Find Thomas' age in terms of x.

• (x-5) years old

• 3x years old

• (3x-5) years old

• x years old

Mrs. Guang purchased four airline tickets to Florida. She will also pay a fee of $55 for an extra piece of luggage. Define a variable and write an expression to represent her total cost of flying to Florida.

• l = (pieces of) luggage

• 4l + 55

• 55t + 4

• t = (number of) tickets

• 4t + 55

• 55l + 4

A plumber charges $50 to visit a house plus $40 for every hour of work. Define a variable and write an expression to represent the total cost of hiring a plumber.

​ (a)   ​ (b)  

• h = hours (of work)

• 40h + 50

• 50v + 40

• 50h + 40

• 40v + 50

• v = visits

Mrs. Guang purchased four airline tickets to Florida. She will also pay a fee of $55 for an extra piece of luggage. Define a variable and write an expression to represent her total cost of flying to Florida.

• l = (pieces of) luggage

• 4l + 55

• 55t + 4

• t = (number of) tickets

• 4t + 55

• 55l + 4

A camp leader figures that she needs one tent for every three campers, plus a tent for herself. Define a variable and write an expression to represent the number of tents needed.

​ ​ (a)   ​ ​ ​ ​ (b)  

• 1c + 3

• 3c + 1

• t = tents

• 1t + 3

• 3t + 1

• c = (number of) campers

Write an expression to represent the following situation.

Susan's age in three years, when a represents her present age.

Mathematical Equivalence

ON

Mark makes $16 an hour. Which expression represents this scenario.

• 16h

• 16 + h

• 16 - h

• h/16