Respuesta :

Answer:

3x+15

Step-by-step explanation:

If your width is 3 and your length is x+5, you need to combine those and do 3(5+x) carry your three and multiply it by 5 and x. This will give you 3x+15. You did not give a value for x but if you know x then plug it in and multiply it to 3 then add 15.

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