Question

the average human heart beats 1.15•10^5 times per day. there are 3.65•10^2 days in one year. how many times does the heart beat in one year

Answer 1

Let b/day = beats per day

Let d/yr = days per year

Let b/yr = beats per year

$(1.15e5b/day)(365d/yr)=41,975,000b/yr$

Answer 2

Answer:   $4.2\cdot10^{7}$ times

Step-by-step explanation:

Given: The average human heart beats in one day=$1.15\cdot10^5$ times

The number of days in one year =$3.65\cdot10^2$

Now, the number of times does the heart beat in one year is given by :-

$1.15\cdot10^5\cdot3.65\cdot10^2\\\\=1.15\times3.65\times10^{5+2}......[\text{Since }a^m\cdot a^n=a^{m+n}]\\\\=4.1975\cdot10^{7}\approx4.2\times10^7$

Hence, the heart beat $4.2\cdot10^{7}$ times in one year.