The speed of the current in a creek is 3mph. A person can kayak 3 mi upstream in the same time that it takes to kayak 9 mi downstream. What is the speed of the person’s kayak in still water?

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)

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

In the diagram of circle o, what is the measure of zabc?