SOLUTION: An adult blue whale can eat 4.0 x 10^7 krill in a day. At that rate, how many krill can an adult blue what eat in 3.65 x 10^2 days? Please explain

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Question 992495: An adult blue whale can eat 4.0 x 10^7 krill in a day. At that rate, how many krill can an adult blue what eat in 3.65 x 10^2 days? Please explain
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
If you have a time to achieve a certain amount (such as a time to go a distance),
and a rate (such as a speed),
to find the amount you achieve (such as how far you can go) you multiply time and rate.
Of course, you have to mind your units, to match the units of time in your time and your rate
For example, to find how far you will go
driving 90minutes (1.5hours)
at 50 miles per hour, you multiply
%281.5hours%29%2A%2850miles%2F%221+hour%22%29=75miles .
In this case, to find how many krill that whale will eat in one year, you calculate
krill=14.6%2A10%5E9krill=highlight%281.46%2A10%5E10%29krillorhighlight%281.5%2A10%5E10%29krill .
The factor 4.0 x 10^7 krill/day is given with 2 significant digits,
meaning that the rate is between 3.95 x 10^7 krill/day and 4.15 x 10^7 krill/day, and maybe your teacher would like you to show the answer with
less precision that your data,
as 1.5%2A10%5E10 krill , meaning somewhere between 1.45%2A10%5E10 krill and 1.55%2A10%5E10 krill.

NOTE: In science, sometimes we would keep an extra significant figure so as not to loose information, even if we are not completely certain. We do that when we may use that result in further calculations. The drug content calculated for 10 individually analyzed tablets is one example.