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Question

Identify the domain and the range of the function y=3x+62 for x as even integers between 4.5 to 10.5.

A
Domain ={5,6,7,8,9,10}
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B
Range ={12,15,18}
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C
Domain ={6,8,10}
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D
Range is all real values.
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Solution

The correct option is C Domain ={6,8,10}
Integer values between 4.5 to 10.5 are 5,6,7,8,9,10.
Even integer values between 4.5 to 10.5 are 6,8,10.

Here, the independent variable is x.
The domain is {6,8,10}.

The corresponding values of y is the range of the function. x y
6 8 10
3(6)+62=242=12 3(8)+62=302=15 3(10)+62=362=18

The range is {12,15,18}.

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