Answer: B or D
Step-by-step explanation:
It would take 10.7 years.
The formula for continuously compounded interest is:

where P is the principal, r is the interest rate as a decimal number, and t is the number of years.
Using our information we have:

We want to know when it will double the principal; therefore we substitute 2P for A and solve for t:

Divide both sides by P:

Take the natural log, ln, of each side to "undo" e:

Divide both sides by 0.065:
<span>4c-6+3c=-34
Add 3c to 4c
7c-6=-34
Add 6 to both sides
7c=-28
Divide 7 on both sides
Final Answer: c=-4</span>