Mod 5 - Equations from Descriptions

A store sells shirts for $15 each. Write an equation to represent the total cost of buying x shirts.

• total cost = 15 - x

• total cost = 15x

• total cost = 15 + x

• total cost = 15 * x

A car rental company charges $30 per day plus $0.25 per mile driven. Write an equation to represent the total cost of renting a car for d days and driving m miles.

• 30d + 0.5m

• 30d + 0.25m + 10

• 30d - 0.25m

• 30d + 0.25m

A rectangular garden has a length that is 4 meters more than its width. Write an equation to represent the length of the garden.

• w / 4

• w - 4

• w * 4

• w + 4

A recipe calls for 2 cups of flour for every 3 cups of sugar. Write an equation to represent the ratio of flour to sugar.

• flour/sugar = 3/2

• flour/sugar = 2/3

• flour/sugar = 1/2

• flour/sugar = 2/1

A train travels at a speed of 60 miles per hour. Write an equation to represent the distance traveled by the train in t hours.

• distance = 60 + t

• distance = 60/t

• distance = 60t

• distance = 60 - t

A company charges a monthly fee of $20 plus $5 for each hour of service. Write an equation to represent the total cost of using the service for h hours in a month.

• total cost = $20 + $5h

• total cost = $20 - $5h

• total cost = $20 + $5 * h

• total cost = $20 * $5h

A triangle has a base that is 3 times its height. Write an equation to represent the base of the triangle.

• h*3

• h/3

• 3h

• h+3

A phone plan costs $30 per month plus $0.10 per minute of talk time. Write an equation to represent the total cost of the phone plan for m minutes of talk time.

• total cost = $0.10 + $30 * m

• total cost = $0.10 * m - $30

• total cost = $30 - $0.10 * m

• total cost = $30 + $0.10 * m

A box contains 20 red balls and 30 blue balls. Write an equation to represent the ratio of red balls to blue balls.

• 2:3

• 1:1

• 4:5

• 3:2

A car travels at a speed of 50 miles per hour. Write an equation to represent the time it takes for the car to travel a distance of d miles.

• time = d / 100

• time = d / 25

• time = d * 50

• time = d / 50