Question

HELP PLEASE!

The first and last terms of a 10-term arithmetic series are listed in the table. What is the sum of the series?

Term Number Term
1 3
10 75

195
390
780
1125

Answer 1

Hmm can you supply me with maybe a screen shot of the graph? might help me a bit...

Answer 2

\[S _{n} = \frac{ n }{ 2} \times ( a + l )\]

Answer 3

l is the last term

Answer 4

\[S _{10} = \frac{ 10 }{ 2 } ( 3 + 75)\]
wt will u get then ?

Answer 5

390 :D thank you again @***[ISURU]***