# 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
1. ## Math

Write 5+7+9+11+13+15+17 in sigma notation.

2. ## math

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

3. ## Math

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

4. ## Calculus

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

5. ## 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) =

6. ## Algebra 2

Evaluate 20(0.5)^(n-1) when n= 3 to 12. Use sigma notation .

7. ## 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

8. ## 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.

9. ## 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

10. ## 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 (x-u)^2 /sigma^2) or b) RF=1/(sigma root(2pi))e-(1/2 ((x-u)^2 )/sigma^2)

11. ## Statistics

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

12. ## algebra

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

13. ## Calculus

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

14. ## 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

15. ## 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.

16. ## 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

17. ## 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

18. ## Math

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

19. ## Calculus

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

20. ## Calculus

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

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.

22. ## 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.

23. ## 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

24. ## 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

25. ## Math

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

26. ## 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 (y-bar - 0.96 * sigma/sqrt(n), y-bar + 1.06 *sigma/sqrt(n)) will be constructed. What is the probability that at least

27. ## math

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

28. ## 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.

29. ## 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 z-axis (z=0 at the origin). Seen from

30. ## Precalculus

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

31. ## Algebra

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

32. ## 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

33. ## math

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

34. ## 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 =

35. ## 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!

36. ## 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!

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 (k-1)(k-2) I solved: k=1 (1-1)(1-2)=0(-1)=0 K=2 (2-1)(2-2) = 1(0)=0 k=3(3-1)(3-2)=2(1)=2 k=4 (4-1)(4-)=3(2)=6 answer: 0+0+2+6 2.

38. ## 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

39. ## 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

40. ## Reiny or Damon or Bobpursley

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

41. ## 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

42. ## 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

43. ## 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...

44. ## Engineering Materials

Using mechanics of materials principles (ie. equations of mechanical equilibrium applied to a free-body 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)

45. ## 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 +

46. ## Algebra II

Please help-I 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

47. ## 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 (3i-2)

48. ## 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.

50. ## 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

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^(10-1) =-1/5*(1/4)^9 = -1/5*1/2621444

52. ## 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 (10-3i)=-28 Can someone please show me how to do this problem?

53. ## 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?

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) =

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) =

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

57. ## Math probability

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

58. ## calculus

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

59. ## 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.

60. ## Geometry

The vertices of a regular 10-gon 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

61. ## 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

62. ## Calculus

The problem with these two questions is that I cannot determine the a and r. The 3rd question-I 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

63. ## 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

64. ## 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!

65. ## 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

66. ## 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

67. ## 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

68. ## 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

69. ## 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?

70. ## 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

71. ## algebra

does anyone know anything about sigma notation?

72. ## 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

73. ## 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^3-3n)/[(n^2)(n+2)(n^2+5)] n=1

74. ## maths

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

75. ## 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

76. ## 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.

77. ## 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

78. ## calc

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

79. ## Algebra

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

80. ## math

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

81. ## Math

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

82. ## Algebra

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

83. ## precalc

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

84. ## Math

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

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

86. ## 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

87. ## Algebra

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

88. ## Math

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

89. ## Algebra

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

90. ## PRE CALC

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

91. ## math

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

92. ## 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 8-packs

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

94. ## math

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

95. ## Math

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

96. ## 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

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?

98. ## 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.

99. ## 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) (x-M)^2 p(x) dx i got (r^2 - 2r)^(1/2) for sigma, but

100. ## 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