Math Practice 101
Homework Explained - Math Practice 101

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Grade 8 HMH Go Math - Answer Keys
Chapter 6: Functions; Lesson 3: Comparing Functions


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  Guided Practice  

Doctors have two methods of calculating maximum heart rate. With the first method, maximum heart rate, y, in beats per minute is \(\text{y} = 220 - \text{x}\), where x is the person’s age. Maximum heart rate with the second method is shown in the table.

  • Question 1 (request help)

    Which method gives the greater maximum heart rate for a 70-year-old?
  •     method
  • Question 2 (request help)

    Are heart rate and age proportional or nonproportional for each method?
  •    

Aisha runs a tutoring business. With Plan 1, students may choose to pay $15 per hour. With Plan 2, they may follow the plan shown on the graph.

  • Question 3 (request help)

    Describe the plan shown on the graph.
  • Type below:
  • Question 4 (request help)

    Sketch a graph showing the $15 per hour option.
  • Type below:
  • Question 5 (request help)

    What does the intersection of the two graphs mean?
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  • Question 6 (request help)

    Which plan is cheaper for 10 hours of tutoring?
  •    
  • Question 7 (request help)

    Are cost and time proportional or nonproportional for each plan?
  • Type below:

  Essential Question Check-In  

  • Question 8 (request help)

    When using tables, graphs, and equations to compare functions, why do you find the equations for tables and graphs?
  • Type below:

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