Algebra 1B

The polynomial given by 1.6t^ 2 - 28t + 200 calculates the heart rate, where t represents the elapsed time in minutes since exercise stopped.

1. What is the heart rate when the athlete first stops exercising?

2. What is the heart rate after 5 minutes?

3. Describe what happens to the heart rate after exercise stops.

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  1. I will assume that you have a typo and you meant
    - 1.6t^2 - 28t + 200

    since it would only decrease for the first 8 or 9 minutes, after that the heart rate would actually increase. This makes no sense.

    which is it ?

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