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notsponge [240]
3 years ago
14

Regular exercise can help a person lower their resting heart rate. Suppose an individual’s resting heart rate, in beats per minu

te, is modeled by the function f(x) = –0.1x 3 + 0.6x 2 + 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
Mathematics
2 answers:
netineya [11]3 years ago
8 0

Answer: 9 weeks

Step-by-step explanation:

-0.1³ + 0.6x² + 85 = 70

x ≈ 8.21998224

The answer is 9 weeks because you must round 8.22 up to 9. The reason you round up to 9 is because must include the numbers after the decimal in a week, but you cannot have 0.22 weeks, so 0.22 rounds up to 1.

sveta [45]3 years ago
5 0

Answer:

9

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

Given Expression:

(4 x 9 - 21) \ 3+6^2

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