Aperson's heartbeat is 71 beats per minute. if his/her heart beats 3.1e9 times in a lifetime, how long (in whole years) does the person live? disregard leap years.

First step: identify how many heart beats in a year.

To determine the heart beats in a year multiply the heart  beats in a minute with years.  

Thus, heart beats in a year comes out to be =

= heart beats in a year

Heart beats in a life time.

Thus, number of years he lives is calculated by the division of  heart beats in a year and heart beats in a life time.

Number of years he lives =

=

=

= years

Thus, number of years he lives is years

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

b.final