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Lynna [10]
3 years ago
7

Simplify using perfect squares or factor trees. Show your work.

Mathematics
1 answer:
Elena L [17]3 years ago
3 0
6

 if u take √36 and put it in the calculator your answer will be 6 or if u take 6×6 and u will end up with 36 
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What is the number of subsets of S= {1, 2, 3…10} that contain five element include 3 or 4 but not both?
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140

Step-by-step explanation:

To construct a subset of S with said property, we have two choices, include 3 in the subset or include four in the subset. These events are mutually exclusive because 3 and 4 can not both be elements of the subset.

First, let's count the number of subsets that contain the element 3.

Any of such subsets has five elements, but since 3 is already an element, we only have to select four elements to complete it. The four elements must be different from 3 and 4 (3 cannot be selected twice and the condition does not allow to select 4), so there are eight elements to select from. The number of ways of doing this is {}_8C_4=70.

Now, let's count the number of subsets that contain the element 4.

4 is already an element thus we have to select other four elements . The four elements must be different from 3 and 4 (4 cannot be selected twice and the condition does not allow to select 3), so there are eight elements to select from, so this can be done in {}_8C_4=70 ways.

We conclude that there are 70+70=140 required subsets of S.

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A sports store received a shipment of 150 footballs and basketballs. 20% were basketballs. How many footballs were in the shipme
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