D. Use the properties of addition to solve the following. 1.1+2+3+ ..+ 9 + 10 - 2. (49 + 63) + 51 = 3. 15 + 38 + 47 + 62 + 53 = 4. 999 +999 + 999 + 999 + 999 = 5. 809 + 803 + 806 + 801 + 807 + 804

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