Use this information to answer the next seven questions.
a student claims uvu students are older than byu students on average. to test this claim, a random sample of 15 students is taken from each university. the average age of the uvu sample is 25 and the average age of the byu students is 22.4.
what are the appropriate hypotheses? use "u" for uvu and "b" for byu.

Which graph represents the following piecewise defined function?

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 radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?