What is the center and radius of the circle with equation x2 + y2 - 4x + 22y + 61 = 0?

Choose the point slope form of the equation below that represents the like that passes through the points (-6,4) and (2, 0)

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)

What is r i 4.5+10r=-6.5 with work pls