pre-calculus

Question

The following table gives the number calories an individual burns per minute in terms of his/her body weight. This information is given for three activities: walking, biking, and swimming.

 

Activity120 pounds150 pounds170 pounds200 pounds
Walking3.14.24.85.7
Running6.48.39.410.6
Swimming7.08.810.011.5
  1. Susie weights 120 pounds. How many calories will she burn if she runs for 1 hour?
  2. Mike weighs 170 pounds. He is planning to swim for 45 minutes. What is the change in the number of calories he burns as he swims for the last 15 minutes?
  3. How many more calories does this person burn?
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