**Question: **Money is deposited in a bank offering interest at an annual rate of 6% compounded continuously. Find the percentage rate of change

## Calculus: General Differentiation – #29248

**Question: **A certain radioactive substance has a half-life of 23 years. For how long must the substance decay so that there is 18% of the original amount remaining? For full credit you must solve an appropriate equation.

**Question: **A certain radioactive substance has a half-life of 23 years. For how long must the substance decay so that there is 18% of the original amount remaining? For full credit you must solve an appropriate equation.