The sum of two number is 30 and the diffrence of two numbers is 10 what are the two numbers

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)