Arithmetic problem

H

HNO

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Sep 9, 2012
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1. The first term of the arithmetic sequence is 5y and the common difference is -3y. Write the equations for Tn and T15.

I have no idea why all of a sudden there are y in the question as I have not done questions like these yet in class. My teacher handed out a list of question to do from the text book and I have no Idea how to do this question whats so ever. I have class tomorrow and I want to have some sort of a general understanding of this type and we tomorrow we go to the next section of the unit and wont be going back to these types of questions.

Sorry I was not able to post and work… I honestly don't know where to start other then putting those numbers into terms?

5y= T1
2y= T2
-1y= T3
 
HNO said:
I have no idea why and I have no Idea how I honestly don't know where to start
5y= T1
2y= T2
-1y= T3
Click to expand...

You started just fine.

If you have an initial term of 5 and a common difference of 3, write a few terms...

5, 5+3, 5+2*3, 5+3*3,

Right?

If you have an initial term of CAT and a common difference of DOG, write a few terms...

CAT, CAT+DOG, CAT+2*DOG, CAT+3*DOG,

Right?

If you have an initial term of 5y and a common difference of -3y, write a few terms...

5y, 5y-3y, 5y-2*3y, 5y-3*3y,

Right?

The symbols don't matter. It is EXACTLY the same thing. Don't let 'y' or anything else scare you.
 
HNO said:
1. The first term of the arithmetic sequence is 5y and the common difference is -3y. Write the equations for Tn and T15.

I have no idea why all of a sudden there are y in the question as I have not done questions like these yet in class. My teacher handed out a list of question to do from the text book and I have no Idea how to do this question whats so ever. I have class tomorrow and I want to have some sort of a general understanding of this type and we tomorrow we go to the next section of the unit and wont be going back to these types of questions.

Sorry I was not able to post and work… I honestly don't know where to start other then putting those numbers into terms?

5y= T1
2y= T2
-1y= T3
Click to expand...

or simply use the formula for arithmetic progression. .An = A + ( n -1 ) D where An is the nth term, A is the first term and D is the common difference.
Tn = 5y +(n-1)(-3y)
 
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