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Since the order of the books chosen doesn't matter, we use the combination formula to find the number of possible selections. Recall that a combination of k items from a set of n items is given by

.
In this problem, n = 8 and k = 3. So the number of possible selections is

. Thus the answer is 56.
Answer:
5
Step-by-step explanation:
distribute: 2x+6 = 4x-4
subtract 2x from both sides: 6 = 2x-4
add 4 to both sides: 10 = 2x
divide both sides by 2: 5 = x
x = 5
Answer:
15
Step-by-step explanation
There are 4 children. They each get 2 pieces. 2*4=8 Joe had 7 candies for himself. 8+7=15.
Answer:
1/2
Step-by-step explanation:
u will need to use desmos but i beleive u evaluate