Question: Please show work 4. (10 points) Is the following argument valid? If taxes are lowered, then income rises. Income rises. . Taxes are lowered. 5.

Please show work

4. (10 points) Is the following argument valid? If taxes are lowered, then income rises. Income rises. . Taxes are lowered. 5. (15 points) Let m and n be integers. Prove that m2 n2 if and only if n is m or n is -m

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