Question

Mr.Gord's current resting pulse is 57 beats per minute. At the current rate, how many heartbeats would Mr.Gord have in a year? Then, if that's been his average pulse his entire 59 years, how many heartbeats has Mr. Gord had in his lifetime ? Show your work and express your solutions in scientific notation.

Answer 1

The number of beats per minute is:

`57`

To find the number of heartbeats in one year, first we need to find how many minutes there are in a year, and multiply that by 57.

Step 1. Find the number of minutes in 1 year.

Minutes per hour:

`60`

The number of hours in 1 day iis 24, thus, the number of minutes per day:

`60*24=1,440\min`

And 1 year has 365 days, thus, the number of minutes per year is:

`1,440*365=525,600\min`

Step 2. Multiply the number of minutes in 1 year, by the number of heartbeats per minute:

`525,600*57=29,959,200\text{ heartbeats}`

We express this in scientific notation as follows:

`29.96*10^6`

Step 3. For the second question, tho find the number of heartbeats in his 59 years, we need to multiply the past result by 59:

`29.96*10^6*59=1,767,640,000`

Again, we express this result in scientific notation:

`1.77*10^9`

Answer: