80
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40 and 22.
To show how to get the answer: x + y = 62; x - y = 18. Two equations and two variables. Add the two equations together and get 2x = 80 --> x = 40, then substitute back into either of the original equations, and y = 22. Check your answer: 40 + 22 = 62 and 40 - 22 = 18.
18
20
20
11 and 7 Add them and you get 18, subtract them and you get 4.
subtract the biggest # from the lowest. If you the numbers 10, 18, 2, and 20, to find the range you would do this: 20-2=18. So the range would be 18.