SOLUTION: Consider the series: 68, 81, x, 113, 132, find the value of x?

Question 359548: Consider the series: 68, 81, x, 113, 132, find the value of x?
Found 2 solutions by vleith, Fombitz:
Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
Look at the first difference between each pair of terms
81-68 = 13
x-81 = ?
113-x = ??
132-113 = 19
Do you see a pattern in the second list of numbers?
13, 15, 17, 19 ?? Each one is 2 greater than the one before.
You take it from there

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Look at the first differences,

Looks like the second differences vary from each other by 2.
So the missing values should be 15 and 17.

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