Write 10 3/4 as a improper fraction

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)

If the discriminant if a quadratic equation is 4 which statement describes the roots?

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?