1. Simultaneous equation

    Ann is older than Betty. Their ages in years are such that twice the square of Betty's age subtracted from the square of Ann's age gives a number equal to 6 times the difference of their ages. Given also that the sum of their ages is equal to 5 times the
  2. Chemistry

    Check answers? 1) Why did J.J. Thomson reason that electrons must be a part of the atoms of all elements? A) Cathode rays are negatively charged particles**** B) Cathode rays can be deflected by magnets C) An electron is 2000 times lighter than a hydrogen
  3. Math Help ASAP!!!

    1. a standard number cube is rolled 180 times. Predict how many times a 3 or 5 will be the result. 31 times 60 times*** 57 times 30 times 2. A number cube is rolled 360 times, and the results are recorded as follows: 61 ones, 26 twos, 36 threes, 76 fours,
  4. Algebra

    A rectangular auditorium seats 1960 people. The number of seats in each row exceeds the number of rows by 9. Find the number of seats in each row. Thanks!
  5. Algebra II

    A rectangular auditorium seats 900 people. The number of seats in each row exceeds the number of rows by 11. Find the number of seats in each row.
  6. math{HELP HELP}

    i don't understand these mmath equations. 1) 6y = 24 2)y / 7 = 2 y=_________ On number one i know that if there is a letter next to a number it means multiplication.and i still don't know how to solve it. On number two i don't understand anything at all:(
  7. Math

    If the absolute value of a negative number is 2.78, what is the distance on the number line between the number and its absolute value? Explain your answer. **I think it would be 2.78 because isn't the absolute value the distance from zero? So wouldn't it
  8. Chemistry

    An electron is in the 5f orbital. What are the values or sets of values for… a. The principle quantum number (n)? b. The angular momentum quantum number (l)? c. The magnetic quantum number (ml)?
  9. math(elmntry euclidean geometry)

    The sum of the angles of a quadrilateral is 360°. Find the conditional, draw a diagram, and state the given and conclusion. CONDITIONAL FORM: If it is the sum of the angles of a quadrilateral, then it measures 360°. DIAGRAM: Not shown, but pictures a
  10. math(elmntry euclidean geometry)help needed ASAP!

    The sum of the angles of a quadrilateral is 360°. Find the conditional, draw a diagram, and state the given and conclusion. CONDITIONAL FORM: If it is the sum of the angles of a quadrilateral, then it measures 360°. DIAGRAM: Not shown, but pictures a
  11. math

    the ratio of the number of students in class A, B and C is 3:7:8. if 10 students leave c and join b , the ratio of the number of students in b and c would be reversed. find the total number of students in classes a,b and c Can I from a equation and solve?
  12. Pre-cal

    What is the probability of getting an even number on a single roll of a number cube if you roll a 3 or greater. My answer: is 1/3 because there are only two numbers that are even and greater than 3 on the number cube. Teacher marked this as wrong. How did
  13. math

    1( which number is the solution for m + 90 = 150 A( 50 B( 60 C( 140 D( 240 2(which number is the solution of n/3 = -12 A( -36 B( -4 C( 4 D( 36 3( use mental math to find the solution of 19b = 190 A(10 B(11 C(171 D(280 4(estimate the solution of y + 1.8 =
  14. Pre-Calc/ Trig

    Find the sum of the three smallest positive values of theta such that 4(cos^2)(2theta-pi) =3. (Give your answer in radians.) LaTEX: Find the sum of the three smallest positive values of $\theta$ such that $4\cos^2(2\theta-\pi) =3$. (Give your answer in
  15. MS. SUE HELP- Chemistry

    Check answers? 1) Why did J.J. Thomson reason that electrons must be a part of the atoms of all elements? A) Cathode rays are negatively charged particles**** B) Cathode rays can be deflected by magnets C) An electron is 2000 times lighter than a hydrogen
  16. Math

    Eighteen students in a class play baseball. Seventeen students in the class play basketball. Thirty students in the class plau either or both sports. Select the Venn diagram that shows the number of students who play basketball and baseball. A.The first
  17. Math

    Make alast of possible out comes... my hundreds place number is greater than 7 and my tenths place number is 1 greater than my hundreds number and my ones place number is less than 2
  18. maths

    Please help me on these problem solving sums. Also show the rough work and answer. First question: If 15% of the children walk to school, 7% cycle to school and 30% come by bus, what percentage come by car ? 2. How much for forty steel nails at €2.50 per
  19. Pre-Algebra

    Write a number sentence for the product shown on the number line ___________________ -10 -8 -6 -4 -2 0 2 The answer i came up with is 10 Because 5 times -2 equals ten. Please and thank-you I'm not sure what's meant by a 'number sentence' here Bowier4.
  20. algebra 1A

    help please! the deepest point of the gulf of mexico lies approximately 12,4000 feet below sea level what is the integer that best expresses the given number. type a negative number with a negative sign, or type a positive number with no sign. is either
  21. Algebra

    Bob and Ray are describing the same number. bob says the number is a positive even integer less than or equal to 20. Ray says the number is divisible by 4. If bobs statement is true, and Rays statement is false what are all the possible numbers? PLEASE
  22. math

    How many times does the number "9" appear in the page numbers of a 100-page newspaper? Choose from the possible answers below. ( )9 ( )10 ( )15 ( )19 ( )20 ( )21 Unless this is a trick question that I have missed, there should be 11 times that the number
  23. Physics

    Two forces are applied to a block of mass MM=12.0 kg that sits on a horizontal, frictionless table. One force F⃗ 1F→1 has a magnitude of 10.0 N and is directed at an angle θ1 equal to 37.0° from the xx direction as labeled in the figure below. As a
  24. Math-college

    Combined, there are 178. ​Asians, Africans,​ Europeans, and Americans in a village. The number of Asians exceeds the number of Africans and Europeans by 69. The difference between the number of Europeans and Americans is 7. If the number of Africans
  25. chemistry

    how do you determine if the atom is a neutral atom or an ion and if the atom is an isotope or not? It is neutral if the number of protons in the nucleus = the number of electrons in the outside shells. More or fewer electrons means it is an ion. An isotope
  26. helllllllllllllllppppppppppppp

    need help math I have a big square of 9little squares in it on the first row going down I got 1 4 6 that makes 11 ok I have to make 11 using those number on the other squares and I can not double the same number in every way it has to come out 11 straght
  27. Math-Ratios

    In a college library, there are 4 times as many nonfiction books as fiction books. A.Find the ratio of the number of nonfiction books to the number of fiction books. B.How many times the number of nonfiction books is the number of fiction books? C.Suppose
  28. math

    Which answer describes the calculations that could be used to solve this problem? Bonita brought 3 bags of apples and 2 pounds of grapes to the picnic. Each bag of apples weighed 4 pounds. How many pounds of apples and grapes did Bonita bring to the
  29. Math

    The ratio of guppies to angelfish in the shop was 2:5. The number of angelfish was 2/3 the number of goldfish. The shopkeeper decides to replace 1/2 of the guppies with some angelfish. The number of angelfish she added was equal to the number of guppies
  30. Math help 1 question!!!!!!!!

    14. Which statement is true? A. Every rational number is a square root. B. Every irrational number is a fraction. C. Every rational number can be written as a fraction. D. Every square root can be written as a whole number.
  31. Math

    The number of calls received by a car towing service averages 14.4 per day (per 24 hour period). After finding the mean number of calls per hour, find the probability that in a randomly selected hour the number of calls is 0
  32. Math

    A number sentence is 50 1/2 ÷1/4 =202. Part A. Create a story or context for this number sentence. Part B. Rewrite this number sentence using multiplication. Part C. Give a verbal explanation that describes how these three numbers are related.
  33. phyical science

    Boyle’s law states that the volume of a gas is inversely proportional to its pressure if the A. temperature and number of particles are constant. B. temperature reaches absolute zero. C. number of particles decreases. D. temperature and number of
  34. college statistics

    In Chapter 5, Exercise 9, we studied the variability of crime rates and police expenditures in the eastern and Midwestern United States. We’ve now been asked to investigate the hypothesis that the number of crimes is related to police expenditures per
  35. geometry

    Hello, Can some one check my work. I just want to make sure I answered the questions correctly. Thanks, Nikki 1) Every rhombus is a parallelogram. True 2) Every parallelogram is a rectangle. False 3) Every rectangle is a square. False 4) Every square is a
  36. math 2ND PART (B)

    Part (b) 1.If next year the number of accounts increases by 20%, the number of technicians has to be increased by 20%, too. How many new technicians have to be hired next year? Please note: your result has to be rounded to the whole number. 2.What will be
  37. math

    the sum of 2+4+6...800
  38. Math

    Find the sum: 7/12 + 7/10 =
  39. Math

    What is the sum for 3/10 and 5/100
  40. Math

    One-third the sum of x, y, and z. How do I form this?
  41. pre cal

    what is the sum of e or 1n
  42. math

    what is the sum of 2/xand x/2?
  43. Math

    What must be added to 5 and 1/3 to get a sum of 9?
  44. Math

    Find the sum 1/4 + 1.5 + 2 3/4 + 2.4 + 1 1/2
  45. Math

    When might I need to estimate a sum?
  46. Algebra 1

    Hey could you help me? What is the sum? 7/4 + ( - 1/5 ) A:31/20 B:39/20 C:6/9 D:-7/20 Is it C?
  47. Math

    Find the sum: -4/7 + (-9/14) = and: -4/5 + 11/12 =
  48. Math

    Divide the sum of x^2+4x-1 & 2x-2 by -3x^4
  49. Math

    find the sum of 2 1/2 and 2/5
  50. math

    what is the sum from 1 to infinity of ( 3n^3 - 4n^2 + 5)/(6n^5-2n+7)
  51. Algebra

    How do you express the sum of 5y-3/9 and 2y-1/2
  52. math

    find the sum of 9.98 and $15.00
  53. geometry

    what is value of z if the sum of 9z+9=180
  54. Math

    How many terms are in this sum? 5x - 6a + 8
  55. calculus

    Evaluate the following sum: 10 E (–1)^n–1(1n^2–9n–3) n=4
  56. Math

    is the sum of (3+3)^2 and 2^3 equal to 26?
  57. Math

    What is the sum of all values of x which |x-3|+|3-x|-1=?
  58. Math

    Find twice the sum of 18 and 56
  59. math

    is each sum greater than or less than 4? 1.7 +0.6 +2.0 = 1.3 +0.86+1.6=
  60. Math

    Find the sum. 5 9/13 + 5 9/13 = ?
  61. Math

    what is the sum of fractions 1/4,3/8, and 5/14?
  62. math

    prove sum(x^2)=n(n+1)(2n+1)/6 from x=1 to x=n
  63. M

    How I can write 35%as the sum of two benchmark
  64. math

    prove sum(x^2)=n(n+1)(2n+1)/2 from x=1 to x=n
  65. Algebra

    Find the following sum: 9 + 10 + 11 + ... + 87
  66. Math

    What is the sum of 14 and the opposite of 12? A) -26 B) -2 C) 2 D) 26 14+-12=2? Am I right?
  67. algebra

    What is the sum of all multiples of 4 between 10 and 30?
  68. Math

    Estimate the sum of 3 1/5 + 2 1/2 A.6 B.5 C.7 D.4
  69. math

    prove sum(x)=n(n+1)/2 from x=1 to x=n
  70. math

    how can find sum (x) from x=1 to x=n
  71. math

    What is the sum of all integers x,such -36 <x<38?
  72. Mathematics

    Divide 40 by the sum of 3 and 5
  73. math

    Sum[(-1)^(n - 1) (7/9^(n - 1)), {n, 1, Infinity}]
  74. math

    Calculate the sum of 1/4 and 1/3.
  75. math

    Calculate the sum of 1/4 and 1/3.
  76. algebra

    the sum of 12 and twice my age
  77. math

    between 41 and 47 the sum of the digits is 10
  78. Algebra

    Given f(x) = (x-1)(x-2) + (x-2)(x-5) + (x - 3)(x-8), what are the sum of the roots of f(x)?
  79. Math

    Find the sum. 3 3/15 + 4 2/5 = ?
  80. Math

    Find the sum. 1 3/5 + 8 1/2 = ?
  81. cj

    what is the sum of 756 and 249?
  82. Math

    How do you write "3 more than the sum of x and y"
  83. math

    How do two fractions have a sum of exactly 1
  84. math

    The sum of 8 and y is less than or equal to −22 .
  85. Math

    A goes from (0, 2) to (4, 2) B from (1, −2) to (2, 1) C from (−1, 0) to (0, 0) D from (−3, −5) to (2, −2) E from (−3, −2) to (−4, −5) F from (−1, 3) to (−3, 0) (a) A + B? (b) E − F? (c) −(B + C)? (d) Which two vectors sum to zero?
  86. Math

    Let f(x) = x^3 + 3x ^2 + 4x - 7 and g(x) = -7x^4 + 5x^3 +x^2 - 7. What is the coefficient of x^3 in the sum f(x) + g(x)? Thanks.
  87. math

    what is the sum of 3a + b + a + b? 1)3a+2b 2)4a+2b 3)a3+b2 4)4a + b 5)6ab
  88. math

    What is the sum of 667 and 23?
  89. Math

    What is the best estimate for the sum of 5/12+2/5
  90. Algebra

    How many terms are in this sum? 5x-6a+8
  91. math

    what is the sum of radical x- 1 and (x-1)^2 when x= 5?
  92. math

    what is the sum of (x^2-3x+2) and (5x^2-3x-8)? how would you solve this???? please help
  93. MATH

    Sum? from n=3 to infinity ((2)/(n+1)-(2)/(n+3))
  94. AP Calculus AB

    The sum of x and y is 8. What is the maximum value of xy-x^2? Please help!
  95. math

    4 times the sum of a and b
  96. math

    To what value does the sum 20+12+36/5---tend as n.
  97. math

    find each sum 2/9 + 1/3
  98. math

    find each sum 1/7+ 3/21
  99. math

    find each sum 2/3+ 1/5
  100. math

    find each sum 1/2 + 2/5