Question

What is the sum of a 22-term arithmetic sequence where the first term is 54 and the last term is -30? (1 points)

264

288

312

336

Answer 1

use this direct formula
\(\Large S_n = \dfrac{n}{2}(a_1+a_n)\)

Answer 2

where n = number of terms = 22
a1 = 1st term = 54
an = last term = -30

just plug in!

Answer 3

Ok

Answer 4

calculate and tell me what you get, i'll verify the answer for you :)

Answer 5

So its \[ \frac{ 22 }{ 2 } \left( 54+ -30\right)\]

Answer 6

correct, go on!

Answer 7

54-30 = 24

Answer 8

264

Answer 9

\(\huge \checkmark \)

Answer 10

OMG YAY THANK YOU SO MUCH

Answer 11

welcome ^_^