Right triangle abc is reflected over ac, then dilated by a scale factor of to form triangle dec. which statements about the two triangles must be true? check all that apply. △abc ~ △dec ∠b ≅ ∠e 3bc = 2ec 3de = 2ab 3m∠a = 2m∠d 2m∠a = 3m∠d

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)