Question

The average human heart beats 1.15 \cdot 10^51.15⋅10 5
1, point, 15, dot, 10, start superscript, 5, end superscript times per day. There are 3.65 \cdot 10^23.65⋅10 2
3, point, 65, dot, 10, squared days in one year.
How many times does the heart beat in one year?
Write your answer in scientific notation, and round to one decimal place.

Answer 1

Given:

• The average human heart beats $1.15\times 10^{5}$ times per day.

• There are $3.65\times 10^{2}$ days in one year.

To find: How many times does the heart beat in one year?

Solution:

In a day, the heart beats $1.15\times 10^{5}$

In $3.65\times 10^{2}$ days, the heart will beat

$\quad 1.15\times 10^{5}\times 3.65\times 10^{2}$ times

$=1.15\times 3.65\times 10^{5}\times 10^{2}$ times

$=\color{blue}{4.1975\times 10^{7}}$ times

Answer:

In one year, the heart will beat $\color{blue}{\bold{4.2\times 10^{7}}}$ times (round to one decimal place).

Answer 2

I hope it is helpful for you ❤️