Find the time it takes for $7,900 to double when invested at an annual interest rate of $9, compounded continuously.
years
Find the time it takes for $ 790,000 to double when invested at an annual interest rate of $9 , compounded continuously.
years
Give your answers accurate to 4 decimal places.
An unknown radioactive element decays into non-radioactive substances. In 560 days the radioactivity of a sample decreases by 28 percent.
(a) What is the half-life of the element?
half-life:
(days)
(b) How long will it take for a sample of $100 to decay to $41 ?
time needed: