How do you calculate surface area for trapezoidal prisms

The distributive property allows you to say that 3(x − 1) = 3x −

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)

The triangle rst, rs = 65 and st = 60. which equation could be used to find the value of angle s?