Write and solve an equation that models a situation-Saint

If 37 less than the product of 15 and a number is 38, which of the below items is true? Which equation would allow you to solve this problem?

• 37x - 15 = 38

• 15x - 75 = 38

• The equation is

  37 - 15x = 38

• The equation is

  15x - 37 = 38

Which equation represents the total cost of a repair by an electrician after x hours?
An electrician charges $90 per hour plus a $50 travelling fee.

• y = 50 - 90x
• y = 90x + 50
• y = -50x + 90
• y = -90 - 50x

Which equation shows the number of bottles left after x days?
A family buys a case of water with 48 bottles and drinks 5 bottles per day.

• y = 48x + 5
• y = -5 + 48x
• y = -5x - 48
• y = 48 - 5x

Which situation can be represented by the equation 56 = 2x - 10 ?

• Sam's age is 10 more than twice the age of Teddy's age. Sam is 56 years old.  How old is Teddy?
• Sam's age is 10 decreased by twice Teddy's age.  Teddy is 56 years old.  How old is Sam?
• Teddy's age is twice Sam's age decreased by 10 years.  Teddy is 56 years old.  How old is Sam?
• Teddy's age is 10 less than twice Sam's age.  Sam is 56 years old.  How old is Teddy?

Which situation can be represented by the equation 40x + 20 = 200 ?

• Mitch owed Jason $200.  Mitch borrowed $20 more.  If Mitch pays Jason back $40 per week, how many weeks will it take him to pay back the money?
• Mitch owed Jason $200.  Mitch already paid Jason back $20.  If Mitch pays back $40 per week, how many weeks will it take him to pay back the money?
• Mitch owed Jason $200.  Mitch borrowed $40 more.  If Mitch pays Jason back $20 per week, how many weeks will it take him to pay back the money?
• Mitch owed Jason $200.  Mitch already paid Jason back $40.  If Mitch pays Jason back $20 per week, how many weeks will it take him to pay back the money?

June has been saving her weekly allowance for the past 15 weeks.  She started with $100 and now she has $280.  Which equation can be used to find the amount of money, w, June receives for her weekly allowance?

• 100 = 280 + 15w
• 280 - 100w = 20
• 280 = 100 + 15w
• 280 = 100 - 15w

If chocolate chip cookies cost $3.00 per cookie plus $2 for boxing them up in a decorated box, what would the expression be?

• y = 3 + 2x

• y = 3x + 2

• y = 3x + 2x

• y = 5x

A plumber charges $50 to make a house call plus $40 for each hour worked. Write an equation to represent this situation.

• y = 50x + 40

• y = 50x + 40x

• y = 50 + 40x

• y = 90x

Speedy Boat Rental charges a $15 deposit fee plus $2 for each hour of use to rent a paddle boat.  Write an equation for C, the total cost, to rent the boat for h hours.

• h = 2C + 15
• C = 15h + 2
• h = 15C + 2
• C = 2h + 15

The Roaming Cell Phone Company charges $15.00 per month plus $0.20 per minute of airtime usage.  If Juanita uses x minutes of airtime, what is an equation that can be used to determine her monthly cell phone bill (C)?

• C = 15 + 0.20x
• C =15 (0.20x)
• C = 15 + x + 0.20
• C = 0.20 + 15x