Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions


First term, a=(x+y)
Common difference, d=(-2y)
Sum up to 'n' terms, S_{n}=\frac{n}{2}(2a+(n-1)d)
Here n=22, then S_{22}=\frac{22}{2}(2(x+y)+(22-1)(-2y))=22x-440y.
0 0 0
Given term = x+y , x-y , x-3y
d= a₂-a₁
  = (x-y - x - y)
  = -2y

Sn = n/2[2a+(n-1)d]


0 0 0
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts