SOLUTION: a12 = -45, a10 = -37; a1 = ?
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Question 1196364: a12 = -45, a10 = -37; a1 = ?
Answer by Solver92311(821) (Show Source): You can put this solution on YOUR website!
First things first: When you want to indicate a subscript in plain text, use an underscore, thus: a_3 means 
. If there is more than one character in the subscript, then enclose the subscript in curly braces, thus: a_{10} means 
. You don't say so (and you most certainly should have) but I will assume an arithmetic sequence.
From to 
is two terms of the sequence. The difference between the two terms given is \ =\ -8)
. Since that is the difference between terms 10 and 12, the common difference for the sequence must be half of that, or 
. The number of terms from to 
is 
. Then 
So: \ =\ -1)
John
My calculator said it, I believe it, that settles it
From
I > Ø
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