Marilyn L. answered 03/30/16
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2X - 2
10 is 2 times 5; 8 is 2 less; 16 is again 2 times the number followed by a -2 times 2 again
So the second number is 2x, the third is -2, the next number is 2x followed by -2 for the one after. So, the number after 28 would be 26 or 2 less. The next number would be 2X or 2 X 26=52