- #1

- Thread starter r-soy
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- #2

Mark44

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You have

T

In the next line you have T

Why do you have 15 on the right side?

In the 3rd line you have

25 = a + 14d

Where did the 25 come from?

If you want help, please post the complete problem statement, using the standard template, together with your work.

- #3

Mark44

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The problem statement, as I see it is this:

T

From the given information,

T(2) = a + (2 - 1)d = 6, and

T(15) = a + (15 - 1) d = 25

So the problem boils down to finding the solution of

a + d = 6

a + 14d = 25

The solution you have for d is incorrect.

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thanks D.Mark , I am sorry for annoying you

- #5

Mark44

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Have you figured out the solution to this system yet?

a + d = 6

a + 14d = 25

- #6

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a+d = 6

I Subtract the second equation from the first and solve for d.

thanks D.Mark for helping me

- #7

Mark44

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So what do you get? The value you got for d before (19/14) was incorrect.

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