Draco recently purchased a new surface book for $2300 the surface book will use 17.28 per year to run in electricity. Write an average cost function. What is the average yearly cost 20 they operate and operate this computer if he intends to use it for the next four years

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)