What are the zeros of f(x)=x^2-12x+36

How can you decide witch operations to use to slice a two step equation

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

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)