Where does the formula )) come from? 2a, 20 from standard form of a quadratic function from the labeling process of a quadratic function from the discriminant of a quadratic function from the quadratic formula

In the 30-60-90 triangle below side s has a length of and side r has a length

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

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)