Show that if x,y,z and w are the first four terms of an arithmetic sequence, then x+w-y=z
2 answers:
Possible Answer
Let d be the common difference. Then, y = x + d, z = x + 2d, and w = x + 3d. Substitute these values into the expression x + w - y and simplify. x + (x + 3d) - (x + d) = x + 2d or z.
It would be 29 because of the c and the w y equal to z
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