April, betty, carmen, and donna are running in a race. april is winning. carmen is 12 meters behind april. betty is 2 meters ahead of carmen. donna is 14 meters behind april. how many meters ahead of donna is betty? (do not include units in your answer.)

Can someone me and plz do the problem

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)

Given: △acm, m∠c=90°, cp ⊥ am , ac: cm=3: 4, mp-ap=1. find am.