Really fast (and easy) maths help! PLEASE!?
Okay, I have a test tomorrow which is worth only like 5% of my overall maths grade, but I really don't want to fail (it's 2 credits, and I need 80 at the end of the year).
In my textbook (for an example) it says: a: 23, d: 6, n: ?
Tn= a + (n-1) d
Tn= 23 + (n-1) 6
Tn= 6n + 17
I don't understand how it jumps from 23 + (n-1)d to 6n + 17.
PLEASE PLEASE EXPLAIN! Oh no :(
- Ravi DhillonLv 59 years agoFavorite Answer
here a(23) is the first term of AP
d(6) is the common difference
Tn is the nth term of the AP
the AP thus =23,29,35,41,47.....
here 5th term is 47, ie n=5. To find the 5th term , write the formula
Tn=a+(n-1)d and put the values of a,d and n.
that is ie 5th term of AP=47
similarly if you want to find the 100th term of AP ie n=100, then
T100=617. Hope it helps .Good luck .
- 9 years ago
what they did is opened the bracket
ie. 23+6n -6
all the best 4 ur exam