Question

A person's resting heart rate is typically between 60 and 100 beats per minute. Noah looks at his watch, and counts 8 heartbeats in 10 seconds.Write an equation for h, the number of times Noah’s heart beats (at this rate) in m minutes.h = _______________

Use m as your variable. The problem expects an algebraic expression with variables for an answer.

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Answer 1

h=48

Explanation:

You should create an even proportion. So you could do seconds over heartbeats or the other way around. I decided to do the other way around. Since yu want to see h in m minutes and in a minute there are 60 seconds, I did 8/10 = h/60. Instead of cross multiplying, I saw that 10 times 6 is 60 so 8 x 6=h. 8 x 6 = 48 so h=48.