anonymous
  • anonymous
.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Maddy1251
  • Maddy1251
Do you know how to apply Sigma Notation?
Maddy1251
  • Maddy1251
I am in online schooling, I feel ya haha. One moment for me to explain
Maddy1251
  • Maddy1251
Anytime.

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Maddy1251
  • Maddy1251
Sn is often called an nth partial sum, since it can represent. the sum of a certain "part" of a sequence. A series can be represented in a compact form, called summation notation, or sigma notation
Maddy1251
  • Maddy1251
we have n=2 and 10 ontop of sigma. So its the terms 2, 3, 4, 5, 6, 7, 8, 9, 10. And yes.
anonymous
  • anonymous
compact form of the sum of the sequence**
Maddy1251
  • Maddy1251
What the equation is beside sigma tells us what we do with n=2 and 10.
Maddy1251
  • Maddy1251
@CShrix is correct.
Maddy1251
  • Maddy1251
\[25(0.3)^{n+1} \] tells us how to perform this equation.
Maddy1251
  • Maddy1251
for n=2, plug in.
Maddy1251
  • Maddy1251
\[25(0.3)^{2-1}\]
Maddy1251
  • Maddy1251
a1=7.5
Maddy1251
  • Maddy1251
Excellent.
Maddy1251
  • Maddy1251
No for n=3
Maddy1251
  • Maddy1251
\[25(0.3)^{2}\]
Maddy1251
  • Maddy1251
a2=2.25
Maddy1251
  • Maddy1251
a1=7.5, a2=2.25
Maddy1251
  • Maddy1251
Keep going until n=10, thats all the more sigma says to go.
Maddy1251
  • Maddy1251
Oh I was subtracting the exponent, not adding. MY BAD. 3.25 + 1.675 + 1.2025 + 1.06075 + 1.018225 + 1.0054675 + 1.00164025 + 1.000492075 + 1.0001476225
Maddy1251
  • Maddy1251
Silly me, glad I looked over. Here are your sums.
Maddy1251
  • Maddy1251
It equals 12.2142224475
Maddy1251
  • Maddy1251
Does it want you to evaluate the entire sigma or a certain n?
Maddy1251
  • Maddy1251
Lol okay. One minute
Maddy1251
  • Maddy1251
Oh okay.
Maddy1251
  • Maddy1251
http://www.mathsisfun.com/numbers/sigma-calculator.html
Maddy1251
  • Maddy1251
385 for what?
Maddy1251
  • Maddy1251
Oh no its okay. Our first term is 0.675, second term is 0.2025. I believe the third is 0.6075. That right there sums up to 1.485. So, I think we can infer what the answer may be.

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