SOLUTION: the end term of the sequence is 9x-z. the third term is 25 so what is the value of z? (the description is (a+n-1d) )

Question 1011296: the end term of the sequence is 9x-z. the third term is 25 so what is the value of z? (the description is (a+n-1d) )
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
n is for the index of a term.
First term is .
Term at n=3 is .
The index for your last term of the sequence is unknown n, so it is , and is given as the expression;
, and you do not know x, , n, d.

You want to find the value for z, yet the other needed quantities for x, , n, and d are still unknown.

The term for index of 3 is . You can use this to find a formula for either OR for d. You will still have three unknown, undetermined variables. Do you understand the difficulty here?

What is the entire problem description and question?
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