Adam and Barbara each toss a Frisbee. Adam's Frisbee has initial position rA(0)=⟨0,0,−1⟩ and velocity vA(t)=⟨1,8t,3t2⟩, and Barbara's Frisbee has initial position rB(0)=⟨0,3,−4⟩ and velocity vB(t)=⟨2t,1,4⟩. At which time(s) t do the Frisbees collide? (Select all that apply.)

Afriend of mine is giving a dinner party. his current wine supply includes 10 bottles of zinfandel, 8 of merlot, and 11 of cabernet (he only drinks red wine), all from different wineries. (a) if he wants to serve 3 bottles of zinfandel and serving order is important, how many ways are there to do this? ways (b) if 6 bottles of wine are to be randomly selected from the 29 for serving, how many ways are there to do this? ways (c) if 6 bottles are randomly selected, how many ways are there to obtain two bottles of each variety? ways (d) if 6 bottles are randomly selected, what is the probability that this results in two bottles of each variety being chosen? (round your answer to three decimal places.) (e) if 6 bottles are randomly selected, what is the probability that all of them are the same variety? (round your answer to three decimal places.)