Assume that y varies directly with x. If y= 1/4 when x= 1/8, find x when y= 3/16. Enter in any fraction using /

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)

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1

Charlie tosses five coins.what is the probability that all five coins will land tails up.