Find the critical value zc necessary to form a confidence interval at the level of confidence shown below. C = 0.91

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)

Which number line correctly shows 0.8 + 0.3?

What rotation was applied to triangle def to create d’e’f’?