Todd is 30 years old. if his target heart rate during aerobic activity is 60-90 % of his maximum heart rate, how fast should his heart beat during exercise (in beats/min)?

Step-by-step explanation:

It is given that Todd is 30 year old and he perform aerobic activity that may increase his heart beat.

maximum heart beat can be calculated by subtracting the age from 220

For 30 year old male Maximum heart beat

=220-30=190

And during exercise his heart beat increases to  60-90 % of maximum value

60 % of 190=114 beats/min

90 % of 190=171 beats/min

So Heart beat can goes up to 114 - 171 beats/min

127

whether it's diameter, or radius, i believe if i remember correctly from school, every amount has to always add up to 180. so if you take 53, and starting adding, long story short, taking 127 and adding it to 53, gives you 180.

answer: c

substitute in the values.

for a:

f(0) = 0 + 9

f(0) = 9

a is a solution.

for b:

f(7) = 14 + 9

f(7) = 23

b is a solution.

for c:

f (3) = 6 + 9

f(3) = 15

c is not a solution. it's supposed to be 14.

for d:

f(2) = 4 + 9

f(2)= 13

d is a solution.