Sites: Global Q&A | Wits | MathsGee Club | Joburg Libraries | StartUps | Zimbabwe | OER

MathsGee is Zero-Rated (You do not need data to access) on: Telkom |Dimension Data | Rain | MWEB

0 like 0 dislike
258 views

The first and second terms of an arithmetic sequence are 10 and 16 respectively.​ ​

• Calculate the 11th term of the sequence
• The sum of the first n terms of this sequence is -560. Calculate n.

| 258 views

0 like 0 dislike
d=16-10=6

a=10

T11= 10+(11-1)6

= 70

-560=n(2(10)+(n-1)6)/2

- 1120=n(6n-14)

6n^2 -14n + 1120=0

n= undefined
by Diamond (44,680 points)

1 like 0 dislike
0 like 0 dislike
1 like 0 dislike
0 like 0 dislike
0 like 0 dislike
0 like 0 dislike
0 like 0 dislike
0 like 0 dislike
3 like 0 dislike
2 like 0 dislike
0 like 0 dislike
0 like 0 dislike
0 like 0 dislike
0 like 0 dislike
1 like 0 dislike
0 like 0 dislike
0 like 0 dislike
4 like 0 dislike
1 like 0 dislike
1 like 0 dislike
1 like 0 dislike
0 like 0 dislike
0 like 0 dislike
0 like 0 dislike
0 like 0 dislike
0 like 0 dislike
0 like 0 dislike
1 like 0 dislike
0 like 0 dislike
2 like 0 dislike
0 like 0 dislike
0 like 0 dislike
0 like 0 dislike
0 like 0 dislike