Question

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Answer 1

Answer:

x1 = 5 + 7 = 12

x2 = 18 - 12 = 6

x3 = 18 + 5 = 23

x4 = 30 - 23 = 7.

Step-by-step explanation:

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Answer 2

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x1 = 5 + 7 = 12

x2 = 18 - 12 = 6

x3 = 18 + 5 = 23

x4 = 30 - 23 = 7