A lot of questions but I need help like.. NOW thank you! (100 Points!!)
Pic 1. Find the circumcenter of the triangle
Pic 2. If BK = 11, what is KQ?
Pic 3. For /\ABC, is BC a median, an altitude or neither?
Pic 4. List the angles of the triangle in order from smallest to largest

If you answer all 4 and they are all right, I'll mark you brainlest!

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)