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

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

undeadknight26 · Answer

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

***[isuru]*** · Answer

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

***[isuru]*** · Answer

l is the last term

***[isuru]*** · Answer

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

anonymous · Answer

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