How long will it take $10,000 to grow to $200,000 if it is invested at 7.5% compounded continuously?

Which of the following situations represents a linear relationship? a. theresa increases the distance she runs by 0.1 miles every week. b. the volume of a box depends on the length of box. c. the amount of money in a bank account increases by 1 percent each year. d. the population of a town doubles every 5 years.

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a