Question

What is the sum of a 30–term arithmetic sequence where the first term is 71 and the last term is –103?

a –384
b –448
c –480
d –416

Answer 1

formula is (n/2)[a + l]

where a = first term n = number terms and l = last term

Answer 2

= 15(71 + -103)

Answer 3

= 15 * -32

Answer 4

So, C Thanks!

Answer 5

yep
yw