Keystone Practice - Unit 7 - Function Rules

• After exactly 16 months, the customer has paid $240.

• After exactly 240 months, the customer has paid $16.

• After exactly 16 months, the customer has paid $270.

• After exactly 270 months, the customer has paid $16.

Tags

CCSS.HSF.LE.B.5

Paul paints houses. He charges his customers a fixed amount to cover the expenses of using a paint sprayer and buying brushes. He also charges an amount based on the number of gallons of paint (x) he will need. The equation shown below represents the total amount (y), in dollars, Paul charges his customers for the materials he will need for a job. What is represented by the number 14.5 in Paul’s equation?

• The number of gallons of paint Paul will need

• The charge for each gallon of paint Paul will need

• The number of hours it will take to complete the paint job

• The fixed amount charged for using a paint sprayer and buying brushes

Tags

CCSS.HSF.LE.B.5

• The prize for first place will always be a multiple of 50.

• The prize for first place will be $325 if 75 people register for the race.

• The prize for first place when there are 50 people registered for the race is twice as much as when there are 25 people registered.

• The prize for first place when there are 100 people registered for the race is twice as much as when there are 25 people registered.

Tags

CCSS.HSF.LE.B.5

• The satellite was at an altitude of 17,600 kilometers before its altitude began to decrease

• The satellite will reenter Earth's atmosphere 23 months after its altitude began to decrease

• The satellite was traveling at a rate of 17,600 kilometers per hour before its altitude began to decrease

• The satellite has been slowing down at a rate of 23 kilometers per hour since its altitude began to decrease

Tags

CCSS.HSF.LE.B.5

Marty is exercising. After exercising, his heart rate is 168 beats per minute. His heart rate decreases at a constant rate of 4 beats per minute until it reaches his resting heart rate. Marty's resting heart rate is 72 beats per minute. How many minutes after exercising will it be until Marty's heart rate returns to his resting heart rate?

• 18

• 24

• 30

• 60

Dana reads a certain book at an average rate of 2 pages every 3 minutes. The fourth chapter of the book is 28 pages. Based on his average rate, how many minutes will it take Dana to read the fourth chapter of the book?

• 9 1/3

• 18 2/3

• 42

• 84

Tags

CCSS.6.RP.A.3B

A swimming pool holds 30,000 gallons of water. The graph shown below represents the amount of water, in gallons, in the swimming pool as the pool is being drained. How much time, in minutes, does it take for the swimming pool to be completely drained?

• 100

• 300

• 900

• 1,000

Tags

CCSS.HSF.LE.B.5

Fernando works at a clothing store. Each week, he earns $120 plus a 25% commission on any clothing he sells. The equation shown below can be used to determine the total amount (y), in dollars, Fernando earns in a week during which he sells x dollars’ worth of clothing. y = 0.25x + 120 The ordered pair (225, 176.25) is a solution of the equation. What does this solution represent in the context of the situation?

• In a week during which Fernando sells $176.25 worth of clothing, he earns a total of $225

• In a week during which Fernando sells $176.25 worth of clothing, he earns $225 in commission

• In a week during which Fernando sells $225 worth of clothing, he earns a total of $176.25

• In a week during which Fernando sells $225 worth of clothing, he earns $176.25 in commission

Tags

CCSS.HSF.LE.B.5

Jeff’s restaurant sells hamburgers. The amount charged for a hamburger (h) is based on the cost for a plain hamburger plus an additional charge for each topping (t) as shown in the equation below. What is the equation for the cost of a hamburger with toppings? What does the number 0.60 represent in the equation h = 0.60t + 5?

• the number of toppings

• the cost of a plain hamburger

• the additional cost for each topping

• the cost of a hamburger with 1 topping

Tags

CCSS.HSF.LE.B.5

A pizza restaurant charges for each pizza and adds a delivery fee. The cost (c), in dollars, to have any number of pizzas (p) delivered to a home is described by the function c = 8p + 3. Which statement is true?

• The cost of 8 pizzas is $11.

• The cost of 3 pizzas is $14.

• Each pizza costs $8, and the delivery fee is 3.

• Each pizza costs $3, and the delivery fee is 8.

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2