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Please help with number 20.

Please help with number 20.-example-1
User Codistan
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Answer: 10y + 1

Explanation:

Since the perimeter is all sides added together, we can add all the sides, then simplify.

3y + 5 + 6y + y - 4 = 6y + 3y + y +5 - 4 = 10y + 1

User Today
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