SOLUTION: So I have the sequence of numbers that goes 13,3,-7,-17... and keeps going. I need to write an equation, but I can't figure out what it could be. Please help?

Question 775113: So I have the sequence of numbers that goes 13,3,-7,-17... and keeps going. I need to write an equation, but I can't figure out what it could be. Please help?
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
You're subtracting 10 from each term. So this is an arithmetic sequence

First term: 13
Common Difference: -10

an = a1 + d(n-1)

an = 13 + (-10)(n-1)

an = 13 - 10n + 10

an = -10n + 23

The equation for the nth term is

$a_{n} = -10n + 23$

RELATED QUESTIONS
I need an explicit formula for the sequence : {2, 6, 12, 20} I have noticed that the... (answered by ad_alta)

Can somebody walk me through a step on this quadratic word problem? A small... (answered by ikleyn,Boreal,ankor@dixie-net.com,stanbon)

I have been trying to figure this problem out for an hour. Please help. Ok so I have a... (answered by stanbon)

I have one last question on my homework and I can�t seem to figure it out. I�ll send the (answered by greenestamps,Theo,apshu)

I need help. Algebra is not my fav subject. My son has homework and I have no idea how... (answered by jim_thompson5910,Alan3354,solver91311,Earlsdon)

Please can you help me with this equation, I have tried but can't figure it out. The... (answered by fners)

I need the math equation for this problem ... I have 18 member on my team I have $180... (answered by josgarithmetic,MathTherapy)

Hey I also have another question I am so sorry. But I don't understand what or how I... (answered by longjonsilver)

I have a parabola that I need to find an equation for. so far all i have is... (answered by venugopalramana)