SOLUTION: A runner's heart rate in beats per minute is given by the formula Heart rate = 65 + 53 / (4t + 1) where t is the number of minutes after the start of a cool-down period. Part A

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Question 790951: A runner's heart rate in beats per minute is given by the formula Heart rate = 65 + 53 / (4t + 1) where t is the number of minutes after the start of a cool-down period.
Part A: Find the runner's heart rate in 10 minutes.
Part B: When is the runner's heart rate equal to 68 beats per minute?
Answer by josgarithmetic(39621) About Me  (Show Source):
You can put this solution on YOUR website!
Just plug in the numbers to do part A.

Solve for t to do part B. You are starting with 68=65%2B53%2F%284t%2B1%29. Here is to get started:
68-65=53%2F%284t%2B1%29
3%284t%2B1%29=53
12t%2B3=53
.
.
you should continue to completion.