Patrick is constructing the circumscribed circle for △rst.

which construction could be his first step?

construct the perpendicular bisector of st .

construct a copy of ∠s that is adjacent to ∠r .

construct the angle bisector of ∠t .

construct the angle bisector of ∠r .
a scalene triangle r s t. side t s is base.

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)