anonymous
  • anonymous
Write the sum using summation notation, assuming the suggested pattern continues. -9 - 3 + 3 + 9 + ... + 81
Mathematics
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
@surjithayer
anonymous
  • anonymous
it is an A.P. a=-9 d=-3-(-9)=-3+9=6 find n by the the formula \[l=a+(n-1)d\] can you find n l=81
anonymous
  • anonymous
are you here?

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

anonymous
  • anonymous
anonymous
  • anonymous
these are answer options find n
anonymous
  • anonymous
i did A @surjithayer
anonymous
  • anonymous
i want to know how? can you show me ?
anonymous
  • anonymous
@surjithayer i guessed im sry i suck at math
anonymous
  • anonymous
ok.
anonymous
  • anonymous
81=-9+(n-1)*6 81+9=(n-1)6 \[\frac{ 90 }{ 6 }=n-1\] n-1=15 n=15+1=16
anonymous
  • anonymous
you got it.
anonymous
  • anonymous
but on all of them n=0
anonymous
  • anonymous
wait is it d?
anonymous
  • anonymous
that means there are 16 terms for n=0,1,2,...,15
anonymous
  • anonymous
here for A ,n=0 a1=-9 a2=-9+6*1=-3 a3=-9+6*2=3 ..... a16=-9+6*15=81
anonymous
  • anonymous
I said A in the first place @surjithayer
anonymous
  • anonymous
A is correct. as i have shown.
dan815
  • dan815
would you like to see how sum of arithmetic series formula comes
anonymous
  • anonymous
could u show me on this one? Write the sum using summation notation, assuming the suggested pattern continues. 5 - 15 + 45 - 135 + ...
anonymous
  • anonymous
it is a G.P. can you find r?
anonymous
  • anonymous
what is gp, i need it in summation notation
anonymous
  • anonymous
gp means geometric progression
anonymous
  • anonymous
for that you have to find r(common ratio)
anonymous
  • anonymous
\[r=\frac{ t _{n} }{ t _{n-1} }\] to be precise 2nd term/1st term
anonymous
  • anonymous
@surjithayer what one did u get as the answer
anonymous
  • anonymous
\[r=\frac{ 45 }{ -15 }=?\]
anonymous
  • anonymous
\[r=\frac{ -15 }{ 5 }=\frac{ 45 }{ -15 }=?\]
anonymous
  • anonymous
@surjithayer its b right?
anonymous
  • anonymous
r=-3 B is correct.

Looking for something else?

Not the answer you are looking for? Search for more explanations.