Real-Life Function Equations: Decimals and Variables

A store sells pencils for $0.75 each. If you buy x pencils, how much will you spend? Write an equation to represent the total cost.

• total cost = x + 0.75

• total cost = 0.75 + x

• total cost = 0.75 * x

• total cost = 0.75 / x

Maria has 3 times as many marbles as John. If John has y marbles, express the number of marbles Maria has in terms of y.

• y

• 2y

• 3y

• 4y

A recipe calls for 2.5 cups of flour. If you want to make x batches of the recipe, how many cups of flour do you need? Write an equation.

• total flour = 2.5 * x

• total flour = 2.5 / x

• total flour = 2.5 - x

• total flour = 2.5 + x

A car travels at a speed of 60.5 miles per hour. How far will it travel in t hours? Write an equation to represent the distance.

• distance = 60.5 + t

• distance = 60.5 * t

• distance = 60.5 / t

• distance = 60.5 - t

If a book costs $12.99 and you buy x books, how much do you spend in total? Write an equation to find the total cost.

• total cost = 12.99 + x

• total cost = 12.99 - x

• total cost = 12.99 * x

• total cost = 12.99 / x

A plant grows 1.2 inches each week. If it has already grown y inches, how tall will it be after 4 weeks? Write an equation to find the height.

• y + 2.4

• y + 6.0

• y + 3.2

• y + 4.8

A movie ticket costs $9.50. If you buy x tickets, how much will you pay? Write an equation to represent the total cost of the tickets.

• total_cost = 9.50 + x

• total_cost = 9.50 - x

• total_cost = 9.50 / x

• total_cost = 9.50 * x

A baker makes 2.5 dozen cookies. If he sells them for $0.50 each, how much money will he make if he sells all the cookies? Write an equation.

• $10.00

• $12.50

• $20.00

• $15.00

A gym charges a monthly fee of $29.99. If you want to find the total cost for x months, write an equation to represent this total cost.

• Total Cost = 29.99 * x

• Total Cost = 29.99 / x

• Total Cost = 29.99 - x

• Total Cost = 29.99 + x

A gardener plants 1.75 feet of flowers each week. If he has already planted y feet, how many feet will he have planted after 3 weeks? Write an equation.

• y + 4.25

• y + 5.25

• y + 7.0

• y + 3.5