Answer:
C. 37.5 minutes
Step-by-step explanation:
You can set up a proportion to help you figure this out.
12/15=30/x (in this proportion, the number of laps are both on the numerator and the time it takes her is on the denomiator.)
Now, just cross multiply and your equations should be: 12·x=15·30, which equals to 12x=450.
Divide 12 on both sides and x=37.5
Answer:
The earning rate is approximately 0.08.
Step-by-step explanation:
We can determine the yearly rate by means of compound interest, which is defined by:
(Eq. 1)
Where:
- Initial deposit, measured in US dollars.
- Earning rate, dimensionless.
- Earning periods, measured in years.
We proceed to clear the earning rate within:






If we know that
and
, then the earning rate is:


The earning rate is approximately 0.08.