NO LINKS!! Please help fill in the blanks. Part 9a

Example:

Carbon-14 has a radioactive half-life of 5,730 years. Use the radioactive decay equation to find the age of a fossil that contains 20% of its original carbon-14.

The fossil is approximately 13 thousand years old.

Side note: carbon-14 decays into nitrogen-14 and a beta particle.

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Question: How long will it take $2,000 to double if it is deposited in an account with an interest rate of 5% compounded continuously?

When interest is compounded continuously, the equation represents the balance, A, after t years, where r is the rate of   interest   and P is the beginning balance or   principal   .

Twice $2,000 is $4,000. Substitute these variables into the compound interest formula, isolate the exponential expression and solve for t.

In about   13.86   years, the amount doubles.