What is the surface area

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

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

I'm marking the brainliest and it's 15 points