Acircular pond is modeled by the equation x^2 + y^2= 225. a bridge over the pond is modeled by a segment of the equation x – 7y = –75. what are the coordinates of the points where the bridge meets the edge of the pond?
a (9, 12) and (–12, 9)
b (9, 12) and (12, 9)
c (9, –12) and (–12, –9)
d (–9, 12) and (12, –9)

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)