anonymous
  • anonymous
what is a back ward 3/E mean in math?
Mathematics
  • Stacey Warren - Expert brainly.com
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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.
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Do you know what topic this is specifically?
anonymous
  • anonymous
Statistics? Calculus?
anonymous
  • anonymous
A simple google doesn't get you anywhere

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anonymous
  • anonymous
Algebra 2b
Directrix
  • Directrix
"There exists"
Directrix
  • Directrix
∃ means "there exist" or "There are"
anonymous
  • anonymous
what do they do in a equation?
anonymous
  • anonymous
Oh that's what you meant by backwards E, no?
Directrix
  • Directrix
"∃ n ∈ N: n is even" is an example. Read as "There exists an n in the set of Natural Numbers such that n is even."
anonymous
  • anonymous
|dw:1332579806325:dw|
anonymous
  • anonymous
No, that's a sigma. It means sum
anonymous
  • anonymous
i took out numbers wanted to solve by myself after i figure out what it means
anonymous
  • anonymous
So if you have \[\sum_{x=1}^{6}x\] it means 1+2+3+4+5+6
anonymous
  • anonymous
top of it how many numbers it would have when expanded?
anonymous
  • anonymous
The bottom is what the first value of the pronumeral (in this case x). The top is the final value for x. Sum for x = 1 to x = 6 above
anonymous
  • anonymous
so if x=1 and on the side of it like had (2x-1) do i plug the 1 in the x? Then expand it using whats in the "( )"?
anonymous
  • anonymous
Can you put the question into the "equation" thing at the bottom of the reply box
anonymous
  • anonymous
ok ill do that
anonymous
  • anonymous
\[\sum_{k=1}^{4} (2k-1)\]
Directrix
  • Directrix
"There exists" comes up in Number Theory. Some teachers use "there exists" in Honors Algebra II classes.
anonymous
  • anonymous
do i use that (2k-1) as a rule when i expanding it? so like 1+3+5+7=16?
anonymous
  • anonymous
Start from k = 1 to k = 4 so thats: 2(1)-1 + 2(2)-1 + 2(3)-1 + 2(4)-1 We can express the sum of a arithmetic series as (n = total number of terms) total sum of n terms = (n/2)(first term+last term) So for this one... Total sum of 4 terms = (4/2)(2[1]-1+2[4]-1) =2*(1+7) =16
anonymous
  • anonymous
okay I think I get it thank you.

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