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TEA [102]
3 years ago
6

Your friend’s heart beats 18 times in 15 seconds when at rest. While running, your friend’s heart beats 25 times in 10 seconds.

Find the heart rate in beats per minute at rest and while running.
Mathematics
1 answer:
Aleks [24]3 years ago
5 0
72 times at rest and 250 while running.
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Substitution doesn't work for this, but elimination does.

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divide by 28 on both sides.

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