SOLUTION: Find the common difference and the 8th term of the arithmetic progression 7, 11, 15, 9

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Question 851995: Find the common difference and the 8th term of the arithmetic progression 7, 11, 15, 9
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
Shouldn't the last term be 19?