SOLUTION: Given the sequence 10, -5, 25, -35, 85, -155 what is the next number?

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Question 1083322: Given the sequence 10, -5, 25, -35, 85, -155 what is the next number?
Answer by Boreal(15235) About Me  (Show Source):
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The differences between the adjacent ones are (-1)^(n+1) 15,30,60,120,240, and the next is 480, since they are all doubling, and it will be positive. 480-155=325. ANSWER