Ariana wants to buy sunglasses that cost $20 the regular sales tax is 5% how much money in dollars is the sales

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)

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18

Jeremy wants to determine the number of solutions for the equation below without actually solving the equation. which method should jeremy use?