1. arithmetic

    if sum of 20th term in an AP is equal to sum of 30th term,what is the sum of 50th term of the AP?

    asked by amit on December 23, 2010
  2. Math

    A takes twice as much time as b and thrice as much time as c to finish a piece of work. Working together they can finish it in 2 days. A can do the work alone in. ??

    asked by Medlin on August 29, 2017
  3. Statistics

    Find the probability that the sum is as stated when a pair of dice is rolled. A.4 or 11 or doubles B. 8,given that the sum is greater than 4. C.Even,given that the sum is greater than 4. A. 4 can be obtained by 1&3, 3&1 or 2&2. 11 can only be obtained by

    asked by Mary on April 2, 2007
  4. math

    How would I do this? A sum of money is divided among three persons, X,Y,Z, kn the ratio 10:7:5. If Y gets $14 more than Z, how much will X get and what is the total sum of money? There is no total sum so how do I find it?

    asked by Alex on October 24, 2009
  5. MATH

    Explain how to find the sum positive three plus negative eight using chips, a number line, or the rules for adding integers. Give the answer with your explanation.

    asked by le on May 23, 2012
  6. 7th grade

    If a man says he has three children who's ages are the product 36,the sum is the house number across the street and his oldest son loves chocolate cake,how old are the kids?

    asked by Reid on October 14, 2008
  7. MATH

    The 2 digits in the mystery number have a sum of 6. you say this mystery number if you count by 3`s or count by 4`s. What is the mystery number?

    asked by Kaidyn on November 10, 2014
  8. Statistics

    How would you do this problem The following is a list of ten measurements: 35,36,-38,-18,73,9,0.-67,-64,-59 10 over Sum under that is i=1 then sum-33xi how do I find the answer

    asked by Mary Ann K on June 30, 2015
  9. math

    how long will it take of a sum of money invested at 80% simple interest the original sum. then solve it.

    asked by williams on March 2, 2017
  10. math

    The second and sixth terms of an arithmetic sequence is 2:5 and their sum is 28. Find the sum of the first 10th term.

    asked by Hitome Muramasa on August 4, 2016
  11. Pre-Calc

    Find the sum of the series 1 + 2 + 4 + 5 + 7 + 8 + 10 + 11 + ... + 299, which is the sum of the integers from 0 to 300, omitting the multiples of 3.

    asked by Anonymous on May 13, 2016
  12. math

    Finding three geometrically numbers knowing that their sum is greater than 78 and 30 units exceeds the sum of the other two.

    asked by Victor on June 10, 2014
  13. Maths

    The sum of the first and second terms of an geometry series is 9.the sum to infinit is 12.calculate the possible values of r.

    asked by Andile on April 25, 2016
  14. Algebra

    How should two nonnegative numbers be chosen so that their sum is 1 and the sum of their squares is as large as possible? As small as possible?

    asked by Adolfo/Kristi on November 4, 2010
  15. Calculus

    Two positive numbers have the property that their product is 2 and their sum is as small as possible. Find their sum.

    asked by Dylan on June 10, 2016
  16. College Algebra

    Find a pair of positive integers such that the sum of the numbers is 20 and the sum of their reciprocals is 4/15.

    asked by Fiona on September 20, 2016
  17. Maths

    A sum when reckoned at 15/2% per annum amount to RS 3920 in 3 years . Find the sum

    asked by Haider on September 6, 2017
  18. Calculus

    Determine convergence of divergence. If convergent, find the sum. Sum (infinity, n = 0) (e/pi)^n

    asked by Jade on March 4, 2013
  19. Maths

    The sum of the first and third terms of a G.P.is 7/3 and the sum of the second and fourth term is 7/4.Fin the first and the common difference

    asked by Efa on July 23, 2016
  20. Math 12th grade

    Find the sum of each infinite series, or state that the sum doesn'nt exist 1/7+5/14+25/28+

    asked by Todd on December 16, 2012
  21. Arithmetic Progression

    the sum of the first and second terms of ap is 4 and the tenth term is 19. find the sum of the 5th and 6th

    asked by Josiah on November 12, 2014
  22. Math help quickly

    Use the expressions for left and right sums and the table below. right-hand sum = summation (n above and i =1 on the bottom) f(ti) * change in t = f(t1) * change in t + f(t2) * change in t + .... + f (tn) * change in t left-hand sum = summation (n above

    asked by Zoe on March 13, 2012
  23. Maths

    Sum of 4 terms in GP is 312 . Sum of 1st and 4th term is 252. Find the numbers.

    asked by Max on February 23, 2017
  24. Calculus

    Evaluate using the sum of a finite geometric series: The sum of 2^i on the range from i = 1 to n. Please Help! I don't know how to make the exponent in 2^i = to i-1!

    asked by Marie on January 10, 2015
  25. Math (Number Theory)

    the following two lines indicate another way to derive the formula for the sum of the first n integers by rearranging the terms in the sum. Fill in the details. 1+2+3+...+n=(1+n)+(2+(n-1))+(3+(n-2))+... =(1+n)+(1+n)+(1+n)+...

    asked by Tiff on April 21, 2014
  26. Combinatorics

    If we roll 19 identical dices together at the same time and calculate the sum of the numbers rolled, how many different possible values of the sum can we get?

    asked by Anonymous on May 24, 2015
  27. MATHS

    The compound interest on a certain sum for 5/2year at 5%per annum compounded annually is rs416.20.find the sum

    asked by Vasif ansari on June 18, 2017
  28. help maths partail sum

    find the partial sum and the limiting sum of the following infinite series 1/4+1/10+4/18.... show step got no ideal at all

    asked by dam on May 5, 2016
  29. Arithemetic progression

    the sum of 18term of an A.P is549 given the common difference is 3 find the 56th term and the sum of its 32term

    asked by Anonymous on February 14, 2014
  30. trig

    8 sin 9x cos3x Rewrite the xpression as a sum or differnce using one of the product sum formulas Simplify if possible

    asked by Rick on February 28, 2008
  31. Math!

    Find the sum of the seix even multiples of 18 starting from 36 six* Sum= 18 (2 + 4 + 6 + 8 + 10 + 12)= =18*2(1 +2 + 3 + 4 + 5 + 6) =36(21)= 36*20 + 36 = 720 + 36= 756 check my math.

    asked by jake p on April 7, 2007
  32. guess and check

    there are 42 question on lindas test. sum of the questions are 2 point and sum were 3 points. she got a perfect score

    asked by lisa on October 19, 2009
  33. math

    1. =SUM(A14,A8) 2. =C8+ 15 3. PMT function {PMT(D4D12,E4,-C4)} What will each of the above formulas do please see if I have the correct answer using excel or another spreadsheet document. 1. Is the sum between the two blocks listed the more blocks the more

    asked by Anonymous on June 5, 2008
  34. Math please check answer

    1. =SUM(A14,A8) 2. =C8+ 15 3. PMT function {PMT(D4D12,E4,-C4)} What will each of the above formulas do please see if I have the correct answer using excel or another spreadsheet document. 1. Is the sum between the two blocks listed the more blocks the more

    asked by Shila on June 4, 2008
  35. algebra

    The total age of Friday and Fred is 68 years. Fred is thrice as old is Friday. How old is Fred?

    asked by Mas on January 2, 2013
  36. Math Help!

    Write an expression in algebra for each of the following: 1. the number of cents in x dimes 2. the difference if four is subtracted from x 3. the sum of three consecutive integers 4. the product of three consecutive integers plz help i don't get these

    asked by Ella on November 24, 2006
  37. 8th grade math - system of equations

    I'm not sure how to solve these. Solve using any method (substitution or elimination) 23. The sum of two numbers is 27. The larger number is three more than the smaller number. What are the two numbers? Ans: l = large; s = small l + s =27 and l = 3S 3s + s

    asked by Alexis on April 27, 2016
  38. Algebra

    Classrooms on one side of the drama building are all numbered with consecutive even integers. If the first room, the room with the smallest classroom number, on this side of the building is numbered x, write an expression in x for the sum of the first five

    asked by Jane on September 1, 2017
  39. physics

    A uniform pole 7m long and weighing 10kg is supported by a boy 2m from one end and a man 3m from the other end.At what point must a 20kg weight be attached so that the man would support thrice as much weight as the boy?

    asked by dave on June 21, 2018
  40. Math

    A census taker came back to a house where a man lived with his three children. The census taker asked, "What is your house number?" The man replied, "The product of my children's ages is 72 and the sum of their ages is my house number." "But that's not

    asked by Anonymous on December 2, 2007
  41. CALC II

    Determine the convergence of the following series using the nth-partial sum or geometric series formula. The sum of n=1 to inifitiy 1/(9n^2+3n-2) How do I start? I'm guessing I should factor out the denominator but whats after that? It is close to a

    asked by Ace on June 18, 2007
  42. operating system

    Top part is a chart job 1 (10k) 20K 30k 50k jOB 2 (15k) 65k 75k jOB 3 (45K) 120K 200K jOB 4 ARRIVES REQUESTING A BLOCK OF 100k? A. CAN JOB 4 BE ACCOMMODATED WHY OR WHY NOT B. IF RELOCATION IS USED WHAT ARE THE CONTENTS OF THE RELOCATION REQISTERS FOR JOB 1

    asked by Ryan on October 27, 2009
  43. Math

    K: 1) simplify: 1 - 1/2 + 1/4 - 1/8 + 1/16 - 1/32 2) Simplify: (1/2 - 1) - (1/3 - 1) + (1/4 -1) 3) In the proportion x^2 : 27 = 9 : x^3, what is x? 4) Between what two consecutive integers does cube root of -100 lie? 5) What is the area of a rectangle

    asked by K on February 5, 2017
  44. math

    I would need help with example: The three numbers are consecutive terms of arithmetic progression and the sum of their second powers is 126. The first number 3 times smaller, the second number with no change and the third number 4 times greater, are the 3

    asked by Viktoria on January 11, 2015
  45. Maths

    If the sum of two natural numbers is 77 and its gusa 7, then all the pairs of searches will be done How to write the sum?Steps send plz

    asked by Dev on December 18, 2017
  46. math

    The sum of the first 12terms of an arithmetic progression is 135 while the sum of the next 8 terms is 210. Find the common difference

    asked by Jay on August 25, 2015
  47. Algebra

    Write each repeating decimal as the sum-of two fractions. Find the sum and simplify. Verify . 0.75483 = 0.127 =

    asked by Carmen on October 17, 2012
  48. math

    a sum of money invested at a simple interest rate R increases to 5/3 times the original sum after 5 years. The value for R is?

    asked by Jay on August 24, 2015
  49. Algebra 2

    Find the sum of the first 12 terms of this sequence: 9,4.5,2.25,... I believe that the pattern is dividing the term by 2,and I keep getting 7.9956 for the sum, but that is incorrect. Anyone understand this?

    asked by Nan on August 7, 2014
  50. Maths

    John, Amos and Peter shared the sum of #126 in the proportiom 1: 2: 4, find the sum of money each received.

    asked by Salvtion c on July 30, 2014
  51. math

    To find three numbers in geometric progression, knowing that their sum is 78 and the highest 30 units exceeds the sum of the first and second term.

    asked by Victor on June 10, 2014
  52. maths

    Five years ago father was thrice son's age. 10 years hence father will be twice sons age, find present age ( use two variables)

    asked by manavi on July 16, 2015
  53. Algebra

    find the sum of the infinite geometric series 1/3+1/9+1/27 sum=a_1/1-r

    asked by Keonn'a on September 28, 2018
  54. math

    Find the sum of the infinite geometric series below, or indicate that the sum does not exist. 15+6+12/5+24/25+...

    asked by Elise on February 26, 2017
  55. math

    the sum of the first 8 terms of an Approval ia 12 and the the sum of the first 16 term is 56.find the first 3 terms3 of the Ap

    asked by cliff on August 17, 2018
  56. stast

    a populstion of n=6 score has sum=12 and sum square= 54 what isthe value of ss for this population?

    asked by mary on September 26, 2011
  57. math

    Find two positive numbers whose sum is 50 such that the sum of their squares is minimum?

    asked by Anonymous on November 11, 2010
  58. MATH

    Look at the following expression, then factor the sum of terms as a product of the GCF and a sum. 42 + 24

    asked by ZECH on November 17, 2017
  59. Math

    What is the sum when the upper bound of summation is infinite and n=1: (1-2)^n -10 *This is sigma by the way* so it's: ∞ Sum((1-2)^n - 10 n=1

    asked by Steve on August 19, 2008
  60. math

    two dice are rolled. their sum is recorded. what is the probability that their sum is between five and ten?

    asked by Donald on April 18, 2011
  61. probability

    two dice are tossed. find the probability that the sum is odd given that the sum is 5 or less

    asked by Anonymous on June 12, 2012
  62. math

    If 28% of a sum is $100.80, what is the sum? A. $129.02 B. $277.78 C. $282.24 D. $360.00 how can i do this

    asked by k on May 28, 2009
  63. Further Mathematics

    The sum of the first three terms of a G.P is 7/8 of the sum to infinity .Find the common ratio.

    asked by Akintunde on May 1, 2013
  64. Maths

    The sum of two numbers is 40.we need to find the no. ,If the sum of their reciprocal is 2/5 ( Quadratic equation)

    asked by Tresa kurian on October 12, 2016
  65. stast

    a populstion of n=6 score has sum=12 and sum square= 54 what isthe value of ss for this population?

    asked by mary on September 26, 2011
  66. maths

    Sum of first 30terms of an a.P. are equal to first 20 terms.show that the sum of first 50terms of the same ap is zero

    asked by Anonymous on February 13, 2016
  67. math word problems

    lydi sold 4/5 of her candles to raise money for the band. she has 8 candles left. how many candles did lydia start with? a coin purse contains quarters, dimes, and nickes. there are the same number of dimes as nickesl and half as many quarters as dimes.

    asked by marko on March 12, 2012
  68. math

    When two die are tossed,throwing a sum of 7 is three times more likely than throwing a sum of 11.if the probability of throwing a sum of 11 is 1:18,what is the probability of throwing a sum of 7?

    asked by Cherie on May 2, 2012
  69. statistics

    An ordinary (fair) die is a cube with the numbers 1 through 6 on the sides (represented by painted spots). Imagine that such a die is rolled twice in succession and that the face values of the two rolls are added together. This sum is recorded as the

    asked by LJ on October 4, 2017
  70. math

    Explain how to find the sum positive five plus negative nineusing chips, a number line, or the rules for adding integers. Give the answer with your explanation

    asked by drae on February 1, 2012
  71. Finite Math

    A pair of dice is rolled and the resulting sum is odd. The complement of this event would be the sum of that is a multiple of 3? True or false

    asked by DeeDee on June 2, 2018
  72. Algebra

    Two questions I need help with. Find the indicated partial sum using the information given. 1. a3=4/9, a7=9/64, S6 Determine wheater the infinite geometric series has a finite sum 2. 6+ 3+ 3/2 + 3/4 +.... 3. -49 + (-7) + (- 1/7) +...

    asked by Becca on April 8, 2013
  73. Math

    Calculate the sum from k=1 to infinity (or n) of (k^4)- (k-1)^4 It says that the solution is n^4, but I do not know why, I tried separating it in a telescoping sum, and expanding it, but I obtain at the end more values than expected. Please help

    asked by Amy on November 13, 2018
  74. Excel

    Like obtaining the sum of squares in an area in Excel =sumsq(a1:g1) I would like an algorithm/module that will give me the sum of cubes. Can anyone help me? thankyouuuuuuuuuuu!

    asked by John on February 24, 2011
  75. math

    a sum of money at certain rate of interest of amount to 8320 in 2years and 9685 in 3 and half years.find the sum ?

    asked by mahe on October 16, 2018
  76. Maths

    If the sum of circumferences of two circles wirh radii r1 & r2 is equal to the circumference of a circle of radius r, then what is true 1 r1+ r2 = r or sum of their squares= r2

    asked by Sanjay on December 26, 2017
  77. college math

    a pair of dice are rolled and the sum is recorded. What is the probability that the sum shown is 8 given that one die is showing 5? Is this done correctly? P(8|5)=1/6 x 1/6= 1/36 I really just want to make sure I have done this the right way!

    asked by Lauren on November 18, 2009
  78. Physics

    The intensity due to a number of indipendent sound sources is the sum of the individual intensities. A) When four quadruplets cry simultaneously, how many decibels greater is the sound intensity level than when a single one cries? B) To increase the sound

    asked by Amanda on March 29, 2008
  79. Math

    The sum to infinity of a G.P. is 16 and the sum of the first 4terms is 15. Find the first 4 terms. Find the sum to infinity of the following (if they converge). ?(a)4+4/3+4/3²+... (b)9+7+5+3+...(can't do, its an AP ?) (c)20-10+5-2.5+...a=20,r=-0.5

    asked by Anonymous on April 21, 2008
  80. physics

    Which one of the following statements describes the condition(s) for which a rigid body is in equilibrium? Only internal forces can be present. The sum of the externally applied forces must be zero, and the sum of the externally applied torques must be

    asked by shamma on April 26, 2014
  81. Math

    question 1: A series is: 1. any list of numbers 2. a summation of quantities whose positions are based upon the natural numbers 3. an arrangement of quantities whose positions are based upon the natural numbers. Which number is it? question 2: For the rule

    asked by Nikki on January 26, 2010
  82. mathematics

    Question # 1: A series is: 1. any list of numbers 2. a summation of quantities whose positions are based upon the natural numbers 3. an arrangement of quantities whose positions are based upon the natural numbers. Which number is it? Question # 2: For the

    asked by Nikki on January 27, 2010
  83. Calc 2

    Can you give me the step by step instructions on how to do this problem? I'm having difficulty understanding Riemann Sum. Let f(x) = 2/x a. Compute the Riemann sum for R4 using 4 subintervals and right endpoints for the function on the interval [1,5]. b.

    asked by Bae on May 2, 2014
  84. Math urgent

    X,Y and Z can do a piece of work in 15 days. If X takes twice as much as Y and Z together and Y takes thrice as much as X and Z together, how long days will each take to finish a work.

    asked by Rabin on September 5, 2016
  85. Maths

    X,Y and Z can do a piece of work in 15 days. If X takes twice as much as Y and Z together and Y takes thrice as much as X and Z together, how long days will each take to finish a work.

    asked by Rabin on September 5, 2016
  86. Algebra 2

    Describe an infinite geometric series with a beginning value of 2 that converges to 10. What are the first four terms of the sequence? a{1} = first term of series                ∞    Infinite Sum = ∑  a{1} •

    asked by Ke$ha on March 31, 2016
  87. math

    secret riddle worksheet riddle: why did the teacher wear sunglasses? 1) different x's _ _ _ _ _ _ _ _ 2) monomialor sum of monomials P O L Y N O M I A L 3) set of data graphed as ordered pairs in a coordinate plane S C A T T E R P L O T 4) 2 solutions that

    asked by confused gurl on May 7, 2007
  88. math please help 9th grade

    Which sum will be irrational? (1 point) 3 + 2 start root 19 end root plus start fraction 7 over 2 end fraction Start Fraction 18 over 3 End Fraction plus Start Fraction 11 over ten thousand End Fraction. –6 + (–3.251) Which product will be rational? (1

    asked by XenaGonzalez on August 25, 2015
  89. ms sue math help please or anyone

    Which sum will be irrational? (1 point) a.3 + 2 b.start root 19 end root plus start fraction 7 over 2 end fraction c Start Fraction 18 over 3 End Fraction plus Start Fraction 11 over ten thousand End Fraction. d. –6 + (–3.251) Which product will be

    asked by Anonymous on September 2, 2015
  90. math help please

    Which sum will be irrational? (1 point) 3 + 2 start root 19 end root plus start fraction 7 over 2 end fraction Start Fraction 18 over 3 End Fraction plus Start Fraction 11 over ten thousand End Fraction. –6 + (–3.251) Which product will be rational? (1

    asked by Anonymous on September 2, 2015
  91. help please with math thanks

    Which sum will be irrational? (1 point) a.3 + 2 b.start root 19 end root plus start fraction 7 over 2 end fraction c Start Fraction 18 over 3 End Fraction plus Start Fraction 11 over ten thousand End Fraction. d. –6 + (–3.251) Which product will be

    asked by Anonymous on September 2, 2015
  92. math help ms sue please

    Which sum will be irrational? (1 point) 3 + 2 start root 19 end root plus start fraction 7 over 2 end fraction Start Fraction 18 over 3 End Fraction plus Start Fraction 11 over ten thousand End Fraction. –6 + (–3.251) Which product will be rational? (1

    asked by Anonymous on September 2, 2015
  93. MATH

    Expand f(x)=ln (1+x/1-x) in a Taylor Series about x=0. You must express your answer using summation notation. ---This is what I tried to do--- So I was thinking of taking the derivative of ln(1+x/1-x) and get 2/x^2-1 And then use the identity 1/1-x= sum

    asked by A. on December 4, 2012
  94. Maths

    The sum to infinity of a convergent is series is 243.The sum of the first five terms 242.Determine the values of the common ratio and the first term

    asked by Nonkululeko on February 25, 2017
  95. algebra

    geometric dot pattern. 1+2+...+80 I'm not sure what the question is, to add up the numbers from 1 to 80? If it is this is an extremely old problem. If you use the progression o 1 dot____ ..o ..oo 3 dots___ .....o .....oo .....ooo .....oooo 4dots____ the

    asked by jaznai on September 12, 2006
  96. Calculus

    Find two numbers whose sum is 10 for which the sum of their squares is a minimum.

    asked by bobby on December 16, 2008
  97. math

    two numbers rolled can be added to get a sum. Find P(sum is even) is it 1/4 ?

    asked by Anonymous on March 8, 2018
  98. math

    find two numbers whose sum is 25 and the sum of whose reciprocals is one sixth

    asked by keeauna on August 26, 2008
  99. math

    the product of two whole numbers is 48. find their greatest possible sum. what is the least sum.?

    asked by jem on July 30, 2015
  100. Geometric progression

    The sum of an infinite g.p. whose common ratio is numerically less the 1 is 32 and sum of the first two is 24.

    asked by Rahul on October 13, 2016