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Q.

Find the sum of 3x + 9 and 4x + 11.

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a

14x + 11

b

7x + 20

c

21x + 20

d

x + 2

answer is B.

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Detailed Solution

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Given: 3x + 9 and 4x +11

The sum = 3x + 9 + 4x +11

Collecting the like terms together, we get

The sum = 3x + 4x + 9 +11

                 = 7x + 20

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