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Mathematics 17 Online
OpenStudy (anonymous):

What is the missing number in this sequence? 19 , 9 , -1 , ___ , -21

OpenStudy (anonymous):

It seems like there's a pattern... could you spot it? :) Here's a hint... you seem to be taking away a certain number, at every step...

OpenStudy (johnweldon1993):

to get from 19 to 9...you do what? to get from 9 to -1...you do what again? (same thing as before) after you see that pattern...apply it to -1

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