Of the following numbers, which one is prime: 14, 13, 21, 33? a. 21 b. 13 c. 14 d. 33

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)

What is the ratio of the length of an object in yards to the length of the same object in miles?

How do the number line graphs of the solutions sets of -23 > x and x-23 differ?