PLEASE HELP ME An account has a principal of ​$400 and a simple interest rate of ​%3.5. The table shows the simple interest earned and the new account balance for​ 1, 2, and 3 years. Complete the table for the fourth year.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 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)