Which of the following are true?

fractions and ratios cannot have zero in the denominator.
fractions and ratios are different names for the same thing.
some fractions and ratios can be written as mixed numbers.
fractions and ratios can be simplified the same way

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)

What is the solution to the equation below? 3/x-2+6=square root x-2 +8

Are the corresponding angles congruent? explain why or why not.