Estimate the number of breaths taken by a human being during an average lifetime. (we estimate an average respiration rate of about 10 breaths per minute and a typical life span of 70 years.)

3.679 ×

Explanation:

Let's assume that average lifespan for normal human being is 70 years.

In 70 years there are 365 days in each year.

70 years = 70 × 365 days

In one day there are 24 hours.

70 years = 70 × 365 × 24 hours

In one hour there are 60 minutes.

70 years = 70 × 365 × 24 × 60 minutes

we estimate an average respiration rate of about 10 breaths per minute. ... (Given)

Thus, for 70 years number of breath are,

n = 70 × 365 × 24 × 60 × 10

n = 3.679 ×

Hence, estimate number of breath over a period of life is 3.679 × .

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up