Regular exercise can help a person lower their resting heart rate. Suppose an individual's resting heart rate, in beats per minute, is modeled by the function f(x) = -0.1x3 + 0.6x2 + 85 after x weeks of regular exercise. How many weeks of exercise are necessary to lower the individual's resting heart rate below 70 beats per minute? 7 weeks 8 weeks 9 weeks 10 weeks​

By doing these 4 things you can start to lower your resting heart rate and also help maintain a healthy heart: Exercise more. When you take a brisk walk, swim, or bicycle, your heart beats faster during the activity and for a short time afterward. But exercising every day gradually slows the resting heart rate.

Step-by-step explanation:

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