**Question: **Determine the number of units \[x\] that produce a maximum profit for the profit function, \[P\left( x \right)=-\frac{{{x}^{2}}}{14,000}+1.68x-4000\]. Also, determine the maximum profit.

## 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.