ANSWER ASAP PLZ determine which of the following formula(s) are needed to prove that a quadrilateral is an isosceles trapezoid. select all that apply.
- midpoint formula
- slope formula
- distance formula
- the area formula
- the perimeter formula

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)