Answer to Question #56905 in Calculus for Allen

Question

1: If you deposit $1,000 into an account that pays 4% interest compounded continuously, how long will it take the account to grow to $2,000? Show work. answer 17.3 years.

2: If you pour a cup of coffee that is 200degrees F, and set it on a desk in a room that is 68Degrees F, and 10 minutes later it is 145degrees F, what temperature will it be 15 minutes after you originally poured it? Show work. answer 126.8 Degrees F

3: The radioactive substance krypton-91 has a very short half-life of about 10 seconds. What is the decay constant for this substance? Show work. answer 0.0693.