An average human has a heart rate of 70 beats per minute. If someone's heart
beats at that average rate over a 70-yr lifetime, how many times would it beat?
a.) 7 x 10 to the 5th power
b.) 2 x 10 to the 6th power
c.) 2x 10 to the 7th power
d.) 3 x 10 to the 9th power