There are 3 possibilities when choosing 1 of 3 books. There are 8 possibilities when choosing 1 of 8 books. Events are independent of each other so "and" would be to multiply. 3 × 8 = 24 possible combinations
You can also see by writing out the possibilities.. Say names of books are {A,B,C} and names of CD's are {1,2,3,4,5,6,7,8} A1, A2, A3, A4, A5, A6, A7, A8 B1, B2, B3, B4, B5, B6, B7, B8 C1, C2, C3, C4, C5, C6, C7, C8
<span>9x-7=-7 You would add 7 to both sides because you want to get to the point were your variable is alone. 9x = 0 Then you would dicide each side by 9 because after doing this your variable would be alone. x = 0 would be your final answer.
For a function to have a derivative in a point has to be continuous at the point, that is, it has to be defined at that point, other wise the derivative would be meaningless.
