The central angle of a circle is equal in measure to one radian when the corresponding arc length is equal to which of the following? a) the radius of the circle b) any chord of the circle c) the diameter of the circle d) one-half the circumference of the circle

Which expression is equivalent to (9x - 3 1/ + 1 3/8)

Can someone me i’m confused. will give brainliest and a whole bunch of points

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)