Atissue can be 0.75 in scientific notation.

a. 7.5 x 10 to the 5th power

b. 7.5 x 10 to the negative fifth power(i chose this one)

c. 75 x 10 to the sixth power

d. 75 x 10 to the negative sixth power

i really need to learn this. why would it be b instead of d, they both work. or the other way around.
will give brainliest

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.)