Ajutați mă vă rog la asta La o sărbătoare , fiecare copil dintr-o grădiniță a primit o carte de 32 lei și o ciocolată de 8 lei. Costul total al cadourilor a fost de 2000 lei. Câți copii au primit cadouri?

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)