Angelique had 20 tokens to use for games at the arcade. she lost some of them. her dad tripled the tokens she had left.

angelique wrote the expression 3(20−t) to find the number of tokens she has now, where t is the number of tokens she lost.

dante correctly wrote another expression, 60−3t, to find the number of tokens angelique has now.

use the drop-down menus to explain what each part of angelique's and dante's expressions mean.

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)