Question

When getting into shape by exercising, the subject's maximum recommended number of heartbeats per minute (h) can be determined by subtracting the subject's age (a) from 220 and then taking 75% of that value. This relation is expressed by which of the following formulas?

Answer 1

We can solve this question as follows:

1. If we subtract the subject's age (a) from 220, we have 220 - a.

2. If we take 75% of that value, we need to take 75% of this amount (220 - a).

3. 75% is equal to 75/100 = 0.75.

Then, the final answer is:

`h=0.75(220-a)=.75(220-a)`

And the option is the first one (A).