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Alexandra [31]
3 years ago
13

Help me with this please

Mathematics
1 answer:
meriva3 years ago
6 0

Answer:

1) E

2) D

3) G

4) I

Step-by-step explanation:

1)

P = 2(l + w)

P = 2(3a + 3 + 8a - 12)

P = 2(11a - 9)

P = 22a - 18

2)

P = 22a - 18

P = 22(3) - 18

P = 66 - 18

P = 48

3)

P = a + b + c

P = 3b + 7 + 7b - 2 + 7b - 2

P = 17b + 3

4)

P = 17b + 3

P = 17(6) + 3

P = 102 + 3

P = 105

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AURORKA [14]
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====================================================

Explanation:

Set A = {4,5,6,7,8,9} since these values are larger than 3 and smaller than 10. We only consider whole numbers in this range.

Set B = {1,2,3,4,5,6,7} represents positive whole numbers less than 8

To find the set A \cap B we need to see which values are in both A and B at the same time. Those values are {4,5,6,7}

So A \cap B = \{4,5,6,7\}

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side note: the notation A \cap B means "A intersect B", so we're looking at where the two sets intersect or overlap (ie what they have in common).

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Answer B

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