hi i startted the problem below by writing a sigma notation of sigma[(2^(n+1))/((n+1)!)] QUESTION: how do i find the sum of 2+(4/2!)+(8/3!)+(16/4!)+... was my attempt wrong, or how do i go from here? thank you!
54,912 results
Math
Write 5+7+9+11+13+15+17 in sigma notation.

math
rewrite the series in sigma notation 4+16+64+...+256+1024

Math
How do I use the sigma notation to express the series : 1+5+25+125+625+3125?

Calculus
Express the following in Sigma notation 2+8+18+32+50+72

Calculus  Alternating Series Test
Determine whether the infinite series, sigma(((1)^(n+1))/n)^2 converges or diverges. My professor gave these in a problem set after he taught the alternating series test. Simplying the series we get, sigma(((1)^(n+1))/n)^2 =sigma(((1)^(2n+2))/(n^2) =

Algebra 2
Evaluate 20(0.5)^(n1) when n= 3 to 12. Use sigma notation .

further mathematics
The roots of the eqn, x^4 + px^3 + qx^2 + rx + s = 0 where p, q, r, s are constants and s does not equal to 0, are a, b, c, d. (i) a^2 + b^2 + c^2 + d^2 = p^2 2q (in terms of p & q) (ii) 1/a + 1/b + 1/c + 1/d = r/s (in terms of r & s) (iii) using the

math
Express the infinite series below using sigma notation and then find the sum. 64 + 40 + 25 + 15.625... Any explanation would be excellent. Thank you so much.

Maths
Express the sum using summation notation: 1  1/2 + 1/3  1/4 + 1/5  ... (to 3n terms) If I'm doing this right so far, with k=1 (the number on bottom of the sigma), the equation after the sigma would be ((1)^(k+1)) / k I'd be able to figure out the term

statistic
Which is the correct form of the relative frequency formula? I could find the answer on google so may a jiskha math expert might know. a) RF=1/(sigma root(2pi))e^(1/2 (xu)^2 /sigma^2) or b) RF=1/(sigma root(2pi))e(1/2 ((xu)^2 )/sigma^2)

Statistics
Suppose X is a normally distributed random variable with the mean u(Mu) and variance sigma^2. Suppose P(X

algebra
rewrite each series using sigma notation 9) 1+4+9+16+25+36 and 10) 4+8+12+16+20

Calculus
Express the sum using sigma notation 1+ 5/6+ 6/8+ 7/10 + 8/12

calculus
rewrite each summation using the sigma notation. Do not evaluate the sums (a)3 + 4 + 5 + . . . + 93 + 94 (b)9 + 16 + 25 + 36 + . . . + 14

Chemistry
How many pi bonds and sigma bonds are in ritalin. I counted 4 pi bonds(double bonds), and 18 sigma bonds(single bonds> I want to make sure I didn't miss count anything.

Maths
Express the sum using summation notation: 1  1/2 + 1/3  1/4 + 1/5  ... (to 3n terms) If I'm doing this right so far, with k=1 (the number on bottom of the sigma), the equation after the sigma would be ((1)^(k+1)) / k I'd be able to figure out the term

chemistry
The structure of graphite is shown below. What kind of hybridization exists for each carbon in the lattice? sp sp2 sp3 sp3d1 sp3d2 What kinds of bonds are present in this structure? hydrogen bonds hydrophobic interactions sigma sp sigma sp2 sigma sp3 sigma

Math
Write 10+6+2+(2)+(6)+(10)+(14) in sigma notation.

Calculus
Express the following in Sigma notation 2+8+18+32+50+72

Calculus
Express the um using sigma notation: 1 +3/4 +5/9+ 7/16+ 9/25

Advanced Algebra
Express the infinite series below using sigma notation and then find the sum. 64 + 40 + 25 + 15.625... Any explanation would be excellent. Thank you so much.

Chemistry
How many pi bonds and sigma bonds are in ritalin. I counted 4 pi bonds(double bonds), and 18 sigma bonds(single bonds> I want to make sure I didn't miss count anything.

Maths
Express the sum using summation notation: 1  1/2 + 1/3  1/4 + 1/5  ... (to 3n terms) If I'm doing this right so far, with k=1 (the number on bottom of the sigma), the equation after the sigma would be ((1)^(k+1)) / k I'd be able to figure out the term

Algebra 2
What's the easiest way to solve this problem 1.28 = Sigma^1 (25  Mu) 1.28 = Sigma^1 (475  Mu) were Sigma and Mu are each different varialbes that are constant... Thanks

Math
Write the sum (in sigma notation) 1 + 3/2 + 2 + 5/2 + 3 + 7/2 + 4 Sigma notation?

statistics
Five independent samples, each of size n, are to be drawn from a normal distribution where sigma is known. For each sample, the interval (ybar  0.96 * sigma/sqrt(n), ybar + 1.06 *sigma/sqrt(n)) will be constructed. What is the probability that at least

math
Prove that (n(top)sigma r=1(bottom))^2(n1(top)sigma r=1(bottom))^2 =n^3 general formula for both notation is r

Chemistry
For each of the bonds listed below use hybridized orbitals to classify the type of sigma bond that is formed between the two atoms. a) The sigma bond between boron and hydrogen in BH3 answer: sp^2  p b) the sigma bond between S and fluoride in SF4.

Physics
A spherical shell of radius R carries a uniform surface charge density (charge per unit area) \sigma. The center of the sphere is at the origin and the shell rotates with angular velocity \omega (in rad/sec) around the zaxis (z=0 at the origin). Seen from

Precalculus
Write the sum using sigma notation. 3/8 + 4/7  5/6 + 6/5  7/4+ 8/3

Algebra
Write each series as a summation in sigma notation. (−1)^2+0^2+1^2+2^2+3^2

math
write the following in a sigma notation 3/32+3/16+3/8+...+12288 so far ive gotten that a=3/32 and r=2/1 can you please help me further

math
use sigma notation to write the maclaurin series for the function 1/(1+x)

statistics
I have a simple set of 10 data points My ten Data Points 2 3 3 4 5 8 9 11 11 13 (mean = 6.9) My prediction nodel predicts the following values for the ten data points (listed in same order) 2 3 4 5 6 7 9 10 11 12 I calculate SST = SIGMA (VALUE  MEAN)^2 =

math
hi i startted the problem below by writing a sigma notation of sigma[(2^(n+1))/((n+1)!)] QUESTION: how do i find the sum of 2+(4/2!)+(8/3!)+(16/4!)+... was my attempt wrong, or how do i go from here? thank you!

math
hi i startted the problem below by writing a sigma notation of sigma[(2^(n+1))/((n+1)!)] QUESTION: how do i find the sum of 2+(4/2!)+(8/3!)+(16/4!)+... was my attempt wrong, or how do i go from here? thank you!

PreCalcPlease check
Please check: 1.Write in expanded form: this is a sigma notation 4 on top signma in middle k=1 on bottom to right of sigma is (k1)(k2) I solved: k=1 (11)(12)=0(1)=0 K=2 (21)(22) = 1(0)=0 k=3(31)(32)=2(1)=2 k=4 (41)(4)=3(2)=6 answer: 0+0+2+6 2.

math
I just need help with this. Write the series in sigma notation. 1/4 + 1/2+ 3/4 + 1 + 5/4 + 3/2 5 A.) 1/4 sigma N n=1 6 B.) 1/4 sigma n n=1 5 C.)sigma n/n+3 n=1 6 D.)sigma n/n+3 n=1

math
I just need help with this. Write the series in sigma notation. 1/4 + 1/2+ 3/4 + 1 + 5/4 + 3/2 5 A.) 1/4 sigma N n=1 6 B.) 1/4 sigma n n=1 5 C.)sigma n/n+3 n=1 6 D.)sigma n/n+3 n=1

Reiny or Damon or Bobpursley
Express the series 11 + 18 + 27 +...+ 171 using sigma notation. Usually you would take 2718 and that's the step between numbers, right? (I think its the kvalue?) But 2718=9 and 1811=7. Are we stepping by k+2 here? Like k, k+2 k+4, k+6...? Please help

Physics
If I wanted to right SIGMA F = ma in the proper notation what would I put above and below SIGMA Would I put a lower case "n" above SIGMA and "i = 0" below it and then put a subscript "i" under the "F" thank you I have been woundering about this as it makes

Physics
If I wanted to right SIGMA F = ma in the proper notation what would I put above and below SIGMA Would I put a lower case "n" above SIGMA and "i = 0" below it and then put a subscript "i" under the "F" thank you I have been woundering about this as it makes

Algebra 2
What's the easiest way to solve this problem 1.28 = Sigma^1 (25  Mu) 1.28 = Sigma^1 (475  Mu) were Sigma and Mu are each different varialbes that are constant...

Engineering Materials
Using mechanics of materials principles (ie. equations of mechanical equilibrium applied to a freebody diagram), derive the following equations. sigma' = sigma cos^2 θ = sigma(1+cos 2θ / 2) and tau = sigma sin θ cos θ = sigma( sin2θ / 2)

Math.
I need help with factoring polynomials using pi and sigma. I understand it, but what is the best way to find the sigma when the terms are, in my opinion, really large? It takes me forever to find it, guessing. Let's say the problem is this: 56x²  53xy +

Algebra II
Please helpI need to write 4+6+8+10 in sigma notation would it be sigma sign in middle (3) on top of sign, n=0 on bottom of signma notation and to the right it would be (4+2n) so it would look like (3) (sigma in middle) (4+2n) n=0

Algebra
find the indicated sum not sure how to type the sigma sign, but here is the problem 6 on top of the sigma sign. under the sigma sign is i=3 and on the right side of the sigma sign (3i2)

Calculus
So this one is confusing me: limit of n as it approaches infinity of (n{SIGMA}i=1) (1/(2^i) *the n is on top of the sigma notation and i=1 is at the bottom. I understand that 'i' would equal (n(n+1))/2 however the algebra from there confuses me.

calculus
write the sigma notation. 5^2+6^2+7^2+...+14^2 You could use capatil E as a sigma. Please help!!

how would I....
how would I express the repeating decimal representaion of 1/9 as an infinite series using sigma notaion? Limit of (as n> infinity) (Sigma) 0.1 + (0.1)^2 + (0.1)^3 +... (0.1)^n = 0.11111.... = 1/9 I think drwis did this right, It looks like lim n>infty

PreCalcPlease check
1.Write 4+6+8+10 in sigma notation: I came up with sigma in the middle 3 on top j=0 on the bottom 2. Find the 10th term of the sequence 1/5,1/20,1/80 this was a geometric sequence so I said a(subscript10) = 1/5*1/4^(101) =1/5*(1/4)^9 = 1/5*1/2621444

Algebra 2
I can't figure out how to find the n on top of the sigma. I have the rest of the equation but I just don't know what to do. I'll use "E" for sigma. nEi=1 (103i)=28 Can someone please show me how to do this problem?

Algebra 2
I can't figure out how to find the n on top of the sigma. I have the rest of the equation but I just don't know what to do. I'll use "E" for sigma. nEi=1 (5+7i)=486 Can someone please show me how to do this problem?

PreCalcPlease check answer
1.Write 4+6+8+10 in sigma notation: I came up with sigma in the middle 3 on top j=0 on the bottom 2n+4 to the right of the signma sign 2. Find the 10th term of the sequence 1/5,1/20,1/80 this was a geometric sequence so I said a(subscript10) =

PreCalcPlease check answer
1.Write 4+6+8+10 in sigma notation: I came up with sigma in the middle 3 on top j=0 on the bottom 2n+4 to the right of the signma sign 2. Find the 10th term of the sequence 1/5,1/20,1/80 this was a geometric sequence so I said a(subscript10) =

help please
calculate A, B in this equation: 1000 A B sigma ai =( sigma ai)  (sigma ai) i=60 i=60 i=2

Math probability
Suppose x is random variable with normal distribution (u,sigma^2) distribution and p(x

calculus
I'm having trouble with a geometric series problem. Determine if the infinite summation of (3)^(n1)/4^n converges or diverges. If it converges, find the sum. So the answer says that sigma 3^(n1)/4^n = 1/4 * sigma (3/4)^(n1) How did they factor out

Precalculus
1.) Use sigma notation to describe the sum of the first ten terms of the arithmetic sequence. 20+18.5+17+15.5+14+12.5+11+9.5+8+6.5 2.)Use sigma notation to describe the sum of the first ten terms of the geometric sequence.

Geometry
The vertices of a regular 10gon are labeled V_1, V_2, \ldots V_n, which is a permutation of \{ 1, 2, \ldots, 10\}. Define a neighboring sum to be the sum of 3 consecutive vertices V_i, V_{i+1} and V_{i+2} [where V_{11}=V_1, V_{12}=V_2]. For each

Calculus
I am trying to solve a sigma/summation notation problem: n = 99, i = 4 and each term in the sequence is determined by (1/i)  (1/(i+1)). Since n = 99, I think it's safe to assume my professor does not want me to actually go through the process of subbing

Calculus
The problem with these two questions is that I cannot determine the a and r. The 3rd questionI don't know what I did wrong. Thanks for the help! Tell whether the series converges or diverges. If it converges, give its sum. infinity (sigma) sin^n (pi/4 + n

Statistics
Let X1,...,Xn be a sample from the N(0, sigma^2). 1) Find the method of moment estimator of sigma^2 2) Find the MLE estimator of sigma^2

Math
which of the following sums is larger and by how much? round your answer to 4 decimal places if necessary 1. 7 over Sigma 15/4(pi/10)^n 2. 11 over Sigma 17/4(4/13)^n please help!

physics
If sigma(t)^2 denotes the standard deviation in the quantity t^2, show that sigma(t)^2=2tsigma(t) I don't even know where to begin... help plzz

math
which of the following sums is larger and by how much? 1. 7 over Sigma 15/4(pi/10)^n 2. 11 over Sigma 17/4(4/13)^n please help me with the steps on how to figure this out! thanks

Math
which of the following sums is larger and by how much? 1. 7 over Sigma 15/4(pi/10)^n 2. 11 over Sigma 17/4(4/13)^n please help me with the steps on how to figure this out! thanks

math
Hi I need someone to check my answers I'll show whatever work I have but for time purposes I'll just post my answers because I think I have most of them correct. Thanks! 1)Find the 20th term of the arithmetic sequence in which a1=3 and d=7. A)143 B)136

chemistry
what does this mean: is (a molecule) sigma or pi in symmetry? the molecule in question is c triple bond c. ....it has 2 pi bonds and 1 sigma bond....which is symmetrical?

Statistics
Suppose that the fit to the simple linear regression of Y on X from 6 observations produces the following residuals: 3.3, 2.1, 4.0, 1.5, 5.1, 1.6. a) What is the estimate of sigma squared? b) What is the estimate of sigma? c) What are the degrees of

algebra
does anyone know anything about sigma notation?

Physics
Two larged size charged plate have a charged density of positive sigma and negative sigma. The resultant force on the proton located midway between them will be

Calculus
determine whether the series converges or diverges. I am stuck on these two problems. Any help is appreciated. infinity sigma (ln n)/n n=2 infinity sigma (5n^33n)/[(n^2)(n+2)(n^2+5)] n=1

maths
If mewi=xi25/10 and sigma fiui=20 and sigma fi=25 what is the mean?

Physics
[b]1. The problem statement, all variables and given/known data[/b] A 90 N sign hangs on the end of a 55 N beam supported by a wire as shown. The beam is attached to the wall by a hinge. What are the horizontal and vertical componetns of the force on the

Algebra 2 / Trig
Here is the problem that I'm having trouble with: Rewrite each series in a sigma notation and find its sum. 1+.09+.81+... I have no idea how I find the common difference or ratio in that one.

algebra
find the indicated sum 4 on top of sigma symbol i=1 on the bottom of sigma symbol 3^i on the right side please help me figure this out

calc
evaluate exactly it's a sigma notation where n=20 k=1 and (1+(1)^k)

Algebra
what does the sigma notation look like for the sequence 1/4,1/9,1/16,1/25

math
what exactly is summation notation? is that like the same thing as sigma notation?

Math
By using the expansion (1 + x)^2. Prove 8[sigma notation]k=0 2^(3K)(N K) = 3^(2n). Thanks

Algebra
Help please! Write the series in sigma notation. 1/4+1/2+3/4+1+5/4+3/2

precalc
Use Sigma Notation to write the sum [10(1/10)^2]+[10(2/10)^2]+[10(3/10)^2]+[10(4/10)^2]

Math
Exprees each series using sigma notation. 3+6+9+12+15

Physics Urgent please help
A disc has charge distribution sigma and radius R . What is the Electric Field in N/C at a point P , located a distance x directly above the center of the disc?Write your answer in terms of sigma, R ,x , k, and pi (type "pi"). Indicate multiplication with

Physics
A disc has charge distribution sigma and radius R . What is the Electric Field in N/C at a point P , located a distance x directly above the center of the disc?Write your answer in terms of sigma, R ,x , k, and pi (type "pi"). Indicate multiplication with

Algebra
Write in sigma notation 1/3,2/9,7/27,14/81,23/243,34/729...

Math
Express the given sums using sigma notation. 1/2+1/2×3+1/3×4+...1/99×100?

Algebra
Write each series as a summation in sigma notation. 5+8+11+14 i=1

PRE CALC
Evaluate: sigma notation of (3cos k(pi) +1) start value: k=0 end value: k=3

math
use sigma notation to write the maclaurin series for the function ln(1+x)

Statistics
Did you ever buy an incandescent light bulb that failed (either burned out or did not work) the first time you turned the switch on? When you put a new light bulb into a light fixture, you expect it to light and most of the time it does. Consider 8packs

PreCalcplease check
Please check this for me expand (3z2b)^5 using Binomial Theorem (a+b)^n = n on top sigma in middle k=0 to right (n/k)a^(nk)b^k (3a2b)^5 = 5 on top sigma in middle k=0 on bottom(5/k)(3a)^5k(2b)^k (5/0)(3a)^5(2b)^0+(5/1)(3a)^4(2b)^1

math
Write the following series using sigma notation: (x/3)((4x^2)/9)+(x^3/3)((16x^4)/81)+((25x^5)/243)...

Math
Write the geometric series 9+3+1..... to 130 term in sigma notation

Statistics
Is a sampling distribution always the same as the curve for a null hypothesis? How does the power of a z test change when sigma increases? Assuming that they are caused solely by chance, sampling distributions will approximate a normal distribution more

Business statistics
1(a)Let Y have a binomial distribution with parameters n and p. We reject Ho: p=1/2 and accept H1: p>1/2 if Y>=c. Find n and c such that the probability of a Type I error is .10, and P(reject Ho/p=2/3)=.95. (b)What is the probability of a Type II error?

trig
It's in sigma notation, so I'm not sure how to type it. I'll just use E lol. Find each sum. 6 E (n+1)/(n+2) n=1 Is this a geometric or arithmetic series? That is pretty much all I really need to know. I appreciate all the help you guys give.

Calculus Damon, Steve, Reiny
I forgot to mention that I am trying to find sigma squared.. given that the mean is r and p(x)= (1/r)(e^(x/r)) on the interval [0,infinity), where r>0.. note: sigma squared= integral sign (inf, inf) (xM)^2 p(x) dx i got (r^2  2r)^(1/2) for sigma, but

Calculus
Use the Left and Right Riemann Sums with 80 rectangle to estimate the (signed) area under the curve of y=e^(3x)−5 on the interval of [10,20]. Write your answer using the sigma notation