Question

Match each arithmetic series with the correct sum
a1 = 3, d = -4, n= 8

Answer 1

here are the answer choices
800
735
-25/3
2646
-245/6
225
663
-88
182

Answer 2

@waterineyes why did you delete your comments? i was reading them lol

Answer 3

Firstly find the last term:

\[\large a_n = a+(n-1)d \implies 3 + (8-1)(-4)\]

Solve this first and find \(a_n\)..

Answer 4

ohk

Answer 5

is it -25?

Answer 6

Yes..

So first term is 3 and last term is -25

So find the sum using:

\[\large Sum = \frac{n}{2}( First + Last)\]

Here n = 8..

Answer 7

ohk

Answer 8

-88!

Answer 9

Yes you are right..