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The answer is -18. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
40
The answer is 40.
18+24+16+22 42+38 =80
69
22
-2p-18
-22
24 + 18 + 20 + 22 = 84
65
160
22-15=7 and 18+7=25 so 25
1.22222, or 22 over 18 (22/18), or 1 and 4 over 18 (1 4/18)
1/2 + 7/22 = 11/22 + 7/22 18/22 9/11.