1. Math

    Let A1,A2...A12 be twelve equally spaced points on a circle with radius 1. Find (A1 A2)^2 + (A1 A3)^2 + ... + A11 A12)^2. (The sum includes the square of the distance between any pair of points, so the sum includes 12 choose 2 = 66 terms.)
  2. maths

    The total number of people in a survey is T. The number of males in the survey is x and the number of doctors is y. The number of doctors that are male is z. Write algebraic expressions for the following using any of the variables x, y, z and T. a. The
  3. geometry

    show that the sum of the squares of the lengths of the medians of triangle equals three-fourths the sum of the squares of the lengths of the sides.(hint:place the triangle so that its vertices are at points(-a,0),(b0)and (0,c))
  4. math

    I would let #1 = x. Then #2 = x+1 #3 = x+2 #4 = x+3 The problem says we want the sum of the first three. That will be x + (x + 1) + (x + 2) and that should be 60 more than the fourth. The fourth is x + 3; therefore, set them equal and add 60 to the fourth.
  5. math

    Craig is creating gift baskets for the food pantry to give away. He has 91 canned food items and 52 boxed food items, giving him a total of 143 items. The sum is shown below. He wants to make sure that every gift basket has an equal amount of canned food
  6. math

    Craig is creating gift baskets for the food pantry to give away. He has 91 canned food items and 52 boxed food items, giving him a total of 143 items. The sum is shown below. He wants to make sure that every gift basket has an equal amount of canned food
  7. algebra

    Take any number (except for 1). Square that number and then subtract one. Divide by one less than your original number. Now subtract your original number. You reached 1 for an answer, didn’t you? How does this number game work? (Hint: Redo the number
  8. Algebra

    Take any number (except for 1). Square that number and then subtract one. Divide by one less than your original number. Now subtract your original number. You reached 1 for an answer, didn’t you? How does this number game work? (Hint: Redo the number
  9. Mathematics

    When you are translating a number from scientific notation to standard form, what does the exponent tell you? The number of zeros to add to the end of the original number the number of places to move the decimal point to the left the number of places to
  10. Math

    When you are translating a number from scientific notation to standard form, what does the exponent tell you? The number of zeros to add to the end of the original number the number of places to move the decimal point to the left the number of places to
  11. ALGEBRA

    i NEED MORE THAN JUST THE EXAMPLE i ALSO NEED TO EXPLANATION Take any number (except for 1). Square that number and then subtract one. Divide by one less than your original number. Now subtract your original number. You reached 1 for an answer, didn’t
  12. maths

    Auston,Ben and carl spent all their mone on a dinner which cost $60. Auston paid thrice amount of money paid by Ben and Carl. Ben paid $1.60 more than Carl. If they were to share the cost of the dinner equally, how much must Ben and Carl each return to
  13. Chemistry

    A quick question. When we use the bond energies to find delta H, should we use the sum of the bond energies of the reactants minus the sum of the bond energies of the products, or vice versa? For example, H2 + Br2 --> 2HBr Given that H-H bond is 436
  14. Maths

    The following sum [(sqrt(36-((6/n)^2))).(6/n)] + [(sqrt(36-((12/n)^2))).(6/n)]+ ... + [(sqrt(36-((6n/n)^2))).(6/n)] is a right Riemann sum for the definite integral F(x) dx from x=0 to 6 Find F(x) and the limit of these Riemann sums as n tends to infinity.
  15. Math

    The following sum [(sqrt(36-((6/n)^2))).(6/n)] + [(sqrt(36-((12/n)^2))).(6/n)]+ ... + [(sqrt(36-((6n/n)^2))).(6/n)] is a right Riemann sum for the definite integral F(x) dx from x=0 to 6 Find F(x) and the limit of these Riemann sums as n tends to infinity.
  16. Calculus

    The following sum [(sqrt(36-((6/n)^2))).(6/n)] + [(sqrt(36-((12/n)^2))).(6/n)]+ ... + [(sqrt(36-((6n/n)^2))).(6/n)] is a right Riemann sum for the definite integral F(x) dx from x=0 to 6 Find F(x) and the limit of these Riemann sums as n tends to infinity.
  17. Arithmetic

    A geometric series has a positive common ratio of r. The series has a sum to infinity of 9 and the sum of the first two terms is 5. Find the first four terms of the series.
  18. Calculus

    The following sum [(sqrt(36-((6/n)^2))).(6/n)] + [(sqrt(36-((12/n)^2))).(6/n)]+ ... + [(sqrt(36-((6n/n)^2))).(6/n)] is a right Riemann sum for the definite integral F(x) dx from x=0 to 6 Find F(x) and the limit of these Riemann sums as n tends to infinity.
  19. MATHS(sum of series)

    1).Find the sum of the n terms of the series Sn=1^2 + 3^2 +5^2+...+(2n-1)^2 2).Find the sum to n terms of 1/(1.2.3) + 3/(2.3.4) + 5/(3.4.5) + 7/(4.5.6) +.... 3) Sum to n terms,the series 1.3.5 + 2.4.6 + 3.5.7 +..
  20. math

    •Post a response to the following: Take any number (except for 1). Square that number and then subtract one. Divide by one less than your original number. Now subtract your original number. Did you reached 1 for an answer? You should have. How
  21. Algebra

    Take any number (except for 1). Square that number and then subtract one. Divide by one less than your original number. Now subtract your original number. You reached 1 for an answer, didn’t you? How does this number game work? (Hint: Redo the number
  22. math

    If dennis rolls 2 number cubes with sides labeled 1 to 6, what is the probability that the sum of the numbers is greater than or equal to 10? daniela flipped a coin and spun a spinner that is divided into four equal- size sectors colored red, yellow,
  23. arithmetic

    the 20th sum of an arithmetic progression is -7 and the sum of the first 20 terms is 620. find the 1st and 30th terms i am looking at using S20 = a(1-rn)/l-r = 620. but i am reallys tuck and think i am very wrong. please help.
  24. Math alg2!

    1.)Mike is 5 years more than twice as old as Tom. The sum of their ages is 65. How old is Mike? 2.)Mrs. Computer is 3 times older than her daughter, Mousy. The sum of their ages is 52. How old is Mousy?
  25. chemistry

    how would you go about calculating the change in H' of the reaction 2N2O <-> 4NO2+O2 if you are given the H'of formation for N2O and NO2 but not the H' of formation for O2? is H' of O2 zero? if so why? and also how can you tell to use change in
  26. Math

    I'm thinking of a number if you multiply my number by 6 then subtracted from 5 you'll get a difference of 7 and 6 times my number what is my number
  27. math

    The difference of two number is 33. the larger number is one more tHan three time the smaller number .find the number.
  28. math

    Ronnie is thinking of a number. He says that he gets the same result when he multiplies his number by 2 as when he adds 5 to his number. What is the number?
  29. Math

    Are these correct? two more than a number and four = 2 + n + 4 ten more than a number plus 3 = n + 10 + 3 three increased by a number minus 5 = n + 3 - 5 six and a number decreased by 7 = n+6-7
  30. Math

    twice a number minus a second number is -1. twice the second number added to three times the first number is 9. find the two numbers.
  31. math

    I asked this question before and I was told my work was correct by my friend insists she is correct HELP I did translate and simplify"six less than twice the sum of a number and three" choices are A)-2x b)2x c)-2x+9 d)2x-3 I set it up 2(x+3)-6 2x+6-6
  32. algebra

    Fiona and Greg play a number guessing game. Greg gives Fiona this hint about his two secret numbers, "The product of the two consecutive positive integers that i am thinking of is 11 more than their sum." What are Greg's numbers?
  33. Math (Complex Numbers)

    Let N be the sum of all prime powers that can be written as 4^n+n^4 for some positive integer n. What are the last 3 digits of N? Details and assumptions: A prime power is a number of the form pk, where p is a prime and k is a positive integer. Examples:
  34. math

    use a flow map to help you figure out the missing number. be sure to use arrows to show the direction of your map, and make sure you have a title. clue 1 i am a multiple of 3 clue 2 i am between the numbers 15 and 36 clue 3 when you add my two numbers
  35. Math

    Independent Events Two dice are rolled. What is te probability of each event? 1. The numbers total 9. 2. The numbers total 2. 3. Both dice display the same number. 4. The sum of the numbers is not 8. Please help, I don't get this.
  36. Math

    Which statement is false? A: Every integer is a real number. B: the number zero is a rational number. C: every irrational number is a real number. D: every real number is a rational number****
  37. Math

    Find the smallest number N such that: The number of divisors of N is A. The number of divisors of A is B. The number of divisors of B is C. The number of divisors of C is 3. Details and assumptions The divisors include 1 and the number itself. For example,
  38. 5th grade

    use a flow map to help you figure out the missing number. be sure to use arrows to show the direction of your map, and make sure you have a title. clue 1 i am a multiple of 3 clue 2 i am between the numbers 15 and 36 clue 3 when you add my two numbers
  39. Math please help with these word problems i have

    1. The circumference of a circle is the product of the number π and twice the radius. 2. The area of a square is the square of the length of a side. 3. The perimeter of a square is four times the length of a side. 4. Force equals the product of mass
  40. PLEASE CHECK MATH TY!

    1. Which of these numbers can be classified as both real and rational? A. 1/2 *** B. -1.016879413894 C. √5 D. 0.89089908999 2.Which is both a real number and an integer? A. √7 B. 0.15 C. -15 *** D. 1/3 3. What is an example of an irrational number? A.
  41. math-calculus

    which of following statements is false 1. The absolute value of a real number is the principal square root of the square of the number. 2. The absolute value of a real number is the distance of the number from zero on a number line. 3. The absolute value
  42. Calculus

    Can someone tell me how to do these? Estimate INT from 0 to 1 2/(1+x^2)dx by subdividing the interval into 8 parts, using (i) the left Riemann sum: INT from 0 to 1 2/(1+x^2)dx (ii) the right Riemann sum: INT from 0 to 1 2/(1+x^2)dx (iii) the trapezoid rule
  43. Calculus

    Can someone tell me how to do these? Estimate INT from 0 to 1 2/(1+x^2)dx by subdividing the interval into 8 parts, using (i) the left Riemann sum: INT from 0 to 1 2/(1+x^2)dx (ii) the right Riemann sum: INT from 0 to 1 2/(1+x^2)dx (iii) the trapezoid rule
  44. Calculus

    Can someone tell me how to do these? Estimate INT from 0 to 1 2/(1+x^2)dx by subdividing the interval into 8 parts, using (i) the left Riemann sum: INT from 0 to 1 2/(1+x^2)dx (ii) the right Riemann sum: INT from 0 to 1 2/(1+x^2)dx (iii) the trapezoid rule
  45. Calculus

    Can someone tell me how to do these? Estimate INT from 0 to 1 2/(1+x^2)dx by subdividing the interval into 8 parts, using (i) the left Riemann sum: INT from 0 to 1 2/(1+x^2)dx (ii) the right Riemann sum: INT from 0 to 1 2/(1+x^2)dx (iii) the trapezoid rule
  46. algebra

    Find two functions, f and g, to express the given function (y = [4/(x-3)] + 1) in each way shown below. Sum Product Quotient Composition I got the sum and the composition, but I can't figure out the product and the quotient. Any help is appreciated,
  47. math

    consider the sum 3/5+3/4. round each fraction and estimate the sum. add the two fraction using a common denominator and then round the result. which estimate is closer to the actual answer.
  48. math probability question

    If a player rolls 2 dice and gets a sum of 3 or 11 he collects $15. if he gets a sum of 12 he gets $3. the cost to play the game is $2. let x be the net money gained by the player. a. construct the prob distribution of the random variable x b. find the
  49. Math - Exponential Notion

    Can someone explain this to me please, I cannot help my son with his homework Do you mean exponential notation? y ^ x = "y raised to the x power" Yep - sorry what do u need help with? Yes - I am not remembering how to do powers - etc. can their be a number
  50. math

    Twice the sum of two numbers exceed three times their difference by 8, while half the sum is one more than the difference. What are the numbers?
  51. Algebra

    What is the difference between the sum of the first 200 positive multiples of three and the sum of the first 200 positive even integers?
  52. Probability, Math

    Two fair dice are thrown. What is the probability: * at least one shows a 3, given the sum is a 7 *the sum is a 7, given at least one shows a 3
  53. arithmetic

    the sum of the first 8 term of an arithmetic progresion is 220,if the third term is 17.Find the sum of the first 6 items
  54. maths

    The sum of the co-efficients in the expansion of (1 - 2x +5x^2)^n is a and the sum of the co-efficients in the expansion of (1 +x)^2n is b.Then (A) a=b (B) (x-a)^2 + (x-b)^2 =0 (C) (sin a)^2 + (cos b)^2 =1 (D) ab=1 Ans. A,B,C But How???
  55. a.p.

    the sum of four terms of an a.p. is 4 and the sum of product of first and last term and product of middle terms in -38, then find the numbes.
  56. Algebra 1

    Tell whether each number in the list is a real number, a rational number, an irrational number, an integer, or a whole number. Then order the numbers from least to greatest. Square root of 64, -5, square root of 9, and 2
  57. msth 117

    Take any number (except for 1). Square that number and then subtract one. Divide by one less than your original number. Now subtract your original number. You reached 1 for an answer, didn’t you? How does this number game work?
  58. help

    a number machine takes any number put into it, multiplies it by 3 and then subtracts 2. reuben put a number into the machine. he took the new number that came out and put that number back into the machine. He took the new number that came out and put that
  59. math

    The sum of three consecutive whole numbers is 96.If the lowest number is y then: a)write down an expression for the other two numbers in terms of y. b)write down an equation involving y. c)find y and hence find the other two numbers.
  60. Unknown

    Carl is asked to draw a triangle with the following specifications: -all sides have whole number lengths in centimeters -the sum of the lengths of the two shortest sides equals 9 centimeters -when the side lengths are placed in order from least to
  61. arithmetic

    Assume you roll a fair dice twice. Two rolls are independent and identically distributed, with probability of rolling a particular number being 1/6. So, for instance, the probability of rolling 5 and then 2 is P(5,2) = P(5) ⋅ P(2) = 1/6 ⋅ 1/6 =
  62. math

    Find a shortcut for computing the sum: 1+3+5+7++11+13+15+17=?? Explain your shortcut and how you could use this same shortcut to find the sum of all the odd numbers form 45 to 99.
  63. maths

    if the sum of the three angle of quadrilateral is equal to 1.5 times the sum of the three angle of a traingle ,what is the measure of the fourth angle of the quadrilateral?
  64. math

    In a Geometric progression the sum of its first 4 term is equal 15, and the sum of the next term is equal to 15/16. find its first term and its common ratio
  65. mathematics

    1} the first term of an AP is 2 and the common difference is 3.Find the sum of the first 11 terms. 2}The 2nd and 5th terms of a GP are -6 and 48 respectively.Find the sum of the first four terms
  66. mathematics

    If 20%of a sum of money is $60.what is50% of the same sum of money
  67. math

    The sum of two numbers is 12. The sum of their reciprocal is 3/8? what are the numbers?
  68. Math

    The sum of two numbers subtracted from twice the sum of those numbers. Please help?
  69. math

    The sum of the first 9 terms of an A.P is 72 and the sum of the next 9 terms is 71, find the A.P
  70. math

    Mary's birthday is between June 13 and June 23. The date of her birthday is not an even number. The sum of the digits is 3. When is Mary's birthday? explain how you figure the problem
  71. math

    Let X1,X2,…,X25 be random sample ~ normal(0,16) and Y1, Y2,…,Y25 be random sample ~ normal(1,9), assume the two samples are independent ,comput P(X>Y) where X=Sum(Xi)/25 and Y=Sum(Yi)/25
  72. Math

    A man and his wife share a sum of money in the ratio 3:2. If the sum of money is doubled, in what ratio should they divide it so that the man still rceives the same amount?
  73. Mathematics

    A sum of money invested at compound interest amounts to rupees for 4624 in 2 years and 2 Rupees 4913 in 3 years the sum of money is
  74. math

    If the sum of the first and the second terms of an infinite Geometric progression is equal to 3/8, and the sum of its term is equal to 1/2. find the common ratio of the first term of the progression
  75. Math

    A man and his wife share a sum of money in the ratio 3:2. If the sum of money is doubled, then in what ratio should they divide it so that the man still receives the same amount?
  76. Calculus

    Evaluate the Riemann sum for (x) = x3 − 6x, for 0 ≤ x ≤ 3 with six subintervals, taking the sample points, xi, to be the right endpoint of each interval and please explain, using a graph of f(x), what the Riemann sum represents. My cousin
  77. Grade 6, percentage

    Last month,sam spent 12% of a sum of money on transport and 25% of the remainder on food.of the rest,he gave $1320 to his parents and then bought a bicycle at a sale.if the usual price of the bicycle was $825 and the discount was 20%,what was the sum of
  78. Grade 6, percentage

    Last month,sam spent 12% of a sum of money on transport and 25% of the remainder on food.of the rest,he gave 1320% to his parents and then bought a bicycle at a sale.if the usual price of the bicycle was 825$ and the discount was 20%,what was the sum of
  79. Math

    What are irrational, rational, and natural numbers? A rational number is a number that can be written as a ratio. That means it can be written as a fraction, in which both the numerator (the number on top) and the denominator (the number on the bottom) are
  80. MATh

    -5g - 6 for g= -2 4 16 10 -13 write an algebraic expression for the sum of 3 coins and c coins c+3 c/3 3c c-3 what value of x is a solution to the equation x-2=16 14 18 21 12 z/-12=-5 7 -60 -17 60 estimate the solition of the equation x-8.1=5.3 to the
  81. please help!!!!! someone

    Each exterior angle of a regular polygon is 15 degrees. 1.Determine the number of sides of the polygon. 2.What is the sum of the interior angles? if the exterior angle is 15, then the interor angle is 165. 165n=(n-2)180 solve for n. I need help to study
  82. matH

    -5g - 6 for g= -2 4 16 10 -13 write an algebraic expression for the sum of 3 coins and c coins c+3 c/3 3c c-3 what value of x is a solution to the equation x-2=16 14 18 21 12 z/-12=-5 7 -60 -17 60 estimate the solition of the equation x-8.1=5.3 to the
  83. MATH

    I NEED HELP -5g - 6 for g= -2 4 16 10 -13 write an algebraic expression for the sum of 3 coins and c coins c+3 c/3 3c c-3 what value of x is a solution to the equation x-2=16 14 18 21 12 z/-12=-5 7 -60 -17 60 estimate the solition of the equation x-8.1=5.3
  84. maths

    For an A.P. sum of 2n terms = 3* sum of n terms then sum of 3n terms : sum of n terms = ?
  85. maths

    For an A.P. sum of 2n terms = 3* sum of n terms then sum of 3n terms : sum of n terms = ?
  86. MATH

    A set of numbers has “the triple-sum property” (or TSP) if there exist three numbers in the set whose sum is also in the set. [Repetitions are allowed.] For example, the set U = {2, 3, 7} has TSP since 2 + 2 + 3 = 7, while V = {2, 3, 10} fails to have
  87. math

    You roll a number cube twice. Find the probability of the event. Rolling a number less than 2 and then a number more than 6 Rolling an odd number then an even number Rolling a 7 then a 5
  88. statistics

    A die has 2 red faces, 2 blue faces, and 2 green faces. It is rolled 240 times. Let R be the number of times red faces appear, and B the number of times blue faces appear. The random variable R is the sum of 240 draws at random with replacement from [pick
  89. math

    A certain computer program lets the user pick a positive number, decreases the number by 60%, and displays the square of the result. If the number displayed is 140% larger than the number that the user picked, what number did the user pick?
  90. discrete math

    Q 8: Count the number of 01-strings with following constraints. (b) The length is 8. Number of 1s is 3 more than number of 0s. (c) The length is 9. Number of 1s is 3 more than number of 0s.
  91. Grade 5 Maths

    A coin box contained some twenty-cent and fifty-cent coins in the ratio 4:3. After 20 twenty-cent coins were taken out to exchange for fifty-cents coins of the same value and put back in the box, the ratio of the number of twenty-cent coins to the number
  92. Math

    3. If a number is not a rational number, then it is _____. (1 point) an integer an irrational number**** A whole number a radical 4.Mrs. Clarkson designed a rectangular garden with a length of 15 meters and a width of 8 meters. She plans to build a walkway
  93. 7th grade math ms.sue

    4. Which statement is true? (1 point) Every real number is an integer. Every rational number is a real number. Every rational number is a perfect square. Every integer is an irrational number. Is this correct? Thanks. 1. Every real number is an integer.
  94. arithmetic

    Assume you roll a fair dice twice. Two rolls are independent and identically distributed, with probability of rolling a particular number being 1/6. So, for instance, the probability of rolling 5 and then 2 is P(5,2) = P(5) ⋅ P(2) = 1/6 ⋅ 1/6 =
  95. math

    One-half of a number plus three-fourths of the number is 2 more than four-thirds of the number. find the number .
  96. algebra

    A number is double of another number.If the difference of the number is twenty, find the number.
  97. Math algebra

    One number is 10 more than the other number. Twice the smaller number is 13 more than the larger number. What are the numbers?
  98. 5th grade

    How do you write a mixed number as a decimal such as 1/2 and the whole number 3? Also 3/4 and the whole number 4. Also 1/5 and the whole number 7. Thank you who will may help me!:)
  99. Math

    A pair of fair dice is rolled. Let E denote the event that the number landing uppermost on the first die is a 3, and let F denote the event that the sum of the numbers landing uppermost is 6. Determine whether E and F are independent events
  100. Please help--algebra!

    Here's the question I'm having trouble with. Please walk me completely through the question and give me the answer so I can thoroughly understand it, so I can solve similar problems in the future. #1: Mary uses a secret code to write messages. First, she