Relationships between quantities

Practice sheet

Fresh questions from the whole chapter, to do on paper.

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  1. A phone plan costs 37 dollars a month plus 15 cents per text. Maya wants a model for her monthly bill. Which is the best definition of the variable?
    1. Let n be the number of texts Maya sends in one month
    2. Let n be texts
    3. Let n be the cost of one text
  2. Car A used 11 gallons of fuel on a trip and car B used 14 gallons on a different trip. To compare how fuel-efficient the two cars are, which quantity is most useful?
    1. Miles traveled per gallon of fuel, for each car
    2. The number of gallons each car used
    3. The total miles each car has ever driven
  3. A runner's pace is the number of minutes she needs for each kilometer. She runs 2 km in 8 minutes. What is her pace, in minutes per kilometer?
  4. How many inches are in 5 feet? (1 foot = 12 inches)
  5. How many meters are 600 centimeters? (1 m = 100 cm)
  6. A rope is 11 yards and 2 feet long. How long is it in feet? (1 yard = 3 feet)
  7. A box really holds 400 cups, but a label says 520. What is the percent error?
  8. A board is really 36 cm long, but Ana measures 40 cm. What is her percent error?
  9. A bag should hold 600 g of rice, with at most 7% error. What is the smallest allowed mass (g)?