How long will it take to triple an initial investment earning 4.75% annual interest that is compounded continuously? what amount presently must be invested earning 5.25% compounded daily for the next 10 years so that it will grow up to be worth $25,000 10 years from now?

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.