Question

Our hearts beat approximately 70 times per minutes. Express in scientific notation how many times the heart beats over a lifetime of 80 years (ignore leap years) round the decimal factor in your scientific notation answer to two decimal places

Answer 1

The total number of heartbeats in an 80-year lifetime, at an average rate of 70 beats per minute, would be 2.94 × 10^9 when expressed in scientific notation.

Step-by-step explanation:

To calculate the number of heartbeats in an 80-year lifetime, we can use the given average heartbeat rate of 70 beats per minute. First, we need to calculate the number of minutes in 80 years:

1. Minutes in an hour: 60
2. Hours in a day: 24
3. Days in a year: 365
4. Years in a lifetime: 80

Now, we combine these values to compute the total beats:

Total minutes = 60 minutes/hour × 24 hours/day × 365 days/year × 80 years = 42,048,000 minutes

Next, we multiply the total minutes by the average heartbeat rate:

Total heartbeats = 70 beats/minute × 42,048,000 minutes = 2,943,360,000 heartbeats

Expressing this in scientific notation to two decimal places:

Total heartbeats = 2.94 × 109 heartbeats over an 80-year lifetime, assuming no leap years and rounding to two decimal places.