If A=(3,9] and B= [6,9) then find A u B

U means "Union" or all the numbers from one set and all the numbers from the other set combined.  So your answer is any of the numbers included in one set or the other or both.

step-by-step explanation:

through just a quick inspection, one can see that the graph of this cubing function starts in quadrant iii and ends in quadrant i.   when x = 0, y = 3, so the y-intercept is (0, 3).

if graphs are part of the problem statement, share them.   .

you probably already have the answer but anyways it's b. 15.0

step-by-step explanation: