Help with Sequence homework.

[JRM]

What does nth term mean?

n=1 for the first term, 2 for the second term, etc. Hence, as JRM says, the rule is 19-4n (if you were writing it formally, it would be something like x subscript n = 19 - 4n).

An arithmetic sequence (those where the difference between successive terms is constant) will be of the form x sub n = a + bn. You can get b simply by looking at the difference between terms, and is here -4. Then you solve for a: you've got 15 = b - 4x1, so b is 19.

Thank you for that.

[yoyo123]

the nth term refers to any number
http://mathcentral.uregina.ca/QQ/databa ... alex1.html" onclick="window.open(this.href);return false;

The link you quote is correct. Your summary of it isn't.

yes as i said it was a quick answer and I have apologised

[Pumpkin Pie]

Thanks all for your help, now I understand.......hadn't come across this in my day many years ago.

This was year 6 homework!

[fatbananas]

Thanks for the warning, Pumpkinpie. I'd better start looking at this stuff now!