El angulo central de un poligono mide 40 grados cuatos lados tiene ?

Use set builder notation to represent the following set: { -3, -2, -1, 0}

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

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)