Posts by scott

Total # Posts: 4,247

  1. Physics

    the formula is for distance traveled over time (t) ... starting from rest ... with uniform acceleration you're using g , so it must be a falling object the answer looks okay ... BUT (there's always one) ... have you learned about significant figures?
  2. Physics

    free fall equation is ... h = -1/2 g t^2 + ho h = 0 (ground level) , ho = drop height plug in values and solve for t ... the positive value
  3. physics

    (m * g * h) / efficiency convert cm to m ... answer is in Joules
  4. Math

    six quarter miles beyond the $1.70 for 1 1/2 to 1 3/4 1.70 + (6 * .45) = 4.40 4.40 * 1.1 = ?
  5. science

    find the circumference ... 2 ? r it goes around 3.5 times in one sec ... in one second, the outer edge travels ... 3.5 circumferences
  6. Physics

    velocity = acceleration * time
  7. Math

    the general slope-intercept form is ... y = m x + b ... the coefficient of the x term is the slope (m) ... the constant term is the y-intercept (b)
  8. Math

    the general slope-intercept form is ... y = m x + b ... the coefficient of the x term is the slope ... the constant term is the y-intercept
  9. math

    the 10t/3 that bob talks about is in c
  10. Geometry

    draw lines through the points in the x and y directions find the right triangle whose hypotenuse is the distance you want ... the lengths of the sides are the distances between the two points in the x ... and y directions you can also find the x and y distances by subtracting ...
  11. physics

    there is a "range equation" wikipedia is a good source
  12. Math

    (now / then) * 100%
  13. Math

    -13 = 5 + 20m - 2m
  14. Physics

    h1 = -1/2 g t^2 + 67.0 h2 = -1/2 g t^2 + 20.0 t set the heights equal and solve for t ... substitute back to find the collision height b. v1 = g t ... downward v2 = 20.0 - gt ... downward the 2nd ball reaches its max height and begins to fall back down before the 1st ball ...
  15. Physics

    momentum is conserved , vertically and horizontally the larger piece carries all of the vertical momentum , and horizontal momentum equal and opposite to the smaller piece find the vertical and horizontal momentum vectors and add them
  16. Physics

    the force on the system is the weight (m*g) of the hanging mass ... a = f / m the tension in the string is the force necessary to give the block the calculated acceleration ... t = m a
  17. physics

    grams are ... what do they measure?
  18. physics

    yes centi is the prefix for one hundredth
  19. Science- Chemistry

    bob ... could you please check your calculations (and units)
  20. Science- Chemistry

    1.1E3 mg/mL * 0.18 = ?
  21. math

    74468 = a * [1 + (.03 / 12)]^(12 * 13) log(74468) = log(a) + 156 log(1.0025)
  22. Algebraic Expressions

    the title of the question is "algebraic expressions" (54 - a) / 6
  23. Math

    there are 36 inches in a yard there are 12 inches in a foot convert the measurements to inches and subtract
  24. math

    2 * 8 (15.5 + 12.25) = 444 (450 - 444) / 444 = .01351 ? 1.4% there appear to be several arithmetic errors in your calculations ... but your method is correct
  25. algebra

    yes
  26. algebra

    it looks like ... g(x) = f(x) + 1 adding 1 to a function results in what kind of translation?
  27. Math

    yes
  28. Math

    7 / 28 = ? / 4 = ? / 100 = ? %
  29. Math

    yes
  30. Math

    ABO is an isosceles triangle ... AO and BO are radii of the circle ... so angles A and B are equal ... A = B central angle O equals the arc AB ... O = 100º A + B + O = 180º
  31. Math

    25 / 15 = 30 / 18 = ? / ?
  32. math

    tire circumference * rpm * minutes per hour / meters per km 2 * ? * 0.30 * 779 * 60 / 1000
  33. physics

    power = m * g * h / t = 63 * 9.8 * 5.2 / 3.5 (watts)
  34. math

    how many texts do you send in a month?
  35. Math

    yes
  36. Math

    how many edges does a cube have?
  37. Math

    good
  38. Maximum area.

    one long side is already there 5x + y = 120 ... y = 120 - 5x area = x (120 - 5x^2) = 120x - 5x^2 the max is on the axis of symmetry ... x = -120 / (2 * -5) = 12 y = 60 ... area = 720
  39. Dimensions of wall

    let w = width , length = w + 4 ... cross section area = w (w + 4) width with border = w + (2 * 2) = w + 4 length with border = w + 4 + (2 * 2) = w + 8 area with border = (w + 4) (w + 8) area of border = [(w + 4) (w + 8)] - [w (w + 4)] = 240 solve for w , then substitute back ...
  40. Math

    missing some units and exponents?
  41. MATH

    the common difference is -11 , so there appear to be 10 terms "missing" between -20 and -141
  42. Math

    yes
  43. Math

    yes
  44. Math

    yes
  45. PHYSICS

    you can have 0.1 s OR 2 m...not both (unless it is two different scenarios) stopping in 0.1 s means traveling 0.2 m ... as bob said , 80 N stopping in 2 m takes 1.0 s ... 8 n
  46. Physics

    is the 200 m distance across the round about part of the 2 km?
  47. physics

    the free-fall equation is ... h = -1/2 g t^2 - 15 t + 55 ... g = 9.8 solve for t ... the positive solution
  48. math

    the free-fall equation is ... h = -1/2 g t^2 - 15 t + 55 ... g = 9.8 solve for t ... the positive solution
  49. MATH

    using a z-score table 16% above the mean of a population is approximately .7 s.d.
  50. math

    sin^2 + cos^2 = 1 ... cos = ?(1 - sin^2) = ?[1 - (-2/5)^2] find the cosine ... remember, it's positive in Quad IV sec = 1 / cos ... tan = sin / cos
  51. Maths

    4 (the short side) is multiplied by 7/4 (the enlarging factor) n times to equal 20 (the short side of the large sheet) 4 * 7/4 * 7/4 ... = 20 n is probably not an integer , so just round it down to the next whole number ... no fractional enlargements you can start with 4 and ...
  52. Maths

    4 * [(7/4)^n] = 20
  53. Math

    circumference = 2 * ? * radius if the radius is increased by 6 ft , how much does the circumference increase?
  54. Math - integers

    ? is 3.14159... [?] = 3 [-?] = -4
  55. Science

    if you labeled this a math question, it might have been answered sooner
  56. Science

    18 to 26 is 4 terms with a difference of 8 ... so the common difference is ... 8 / 4 = ? the 20th term is 8 terms beyond 26 (the 12th term) ... 26 + 8 differences = ?
  57. maths

    there are 36 ways for two dice to end up 6 of those ways have both dice showing the same number of points
  58. Science

    is there a question for any of the three entries?
  59. geometry

    the dilated points will be 3 times the distance from F as the original points ... the direction is along the line from F to the point being dilated A' is 3 times farther from F than A , along the FA line D is 1/3 the distance from F to D' , along the FD' line F to ...
  60. Sat Math

    this is kind of a solve by inspection (and thought) problem the "magic" value is 10 ... 2x + 6 must be GREATER than 10 (not equal to) how small can x (a positive integer) be , if 2x must be greater than 4?
  61. Sat Math

    y = m^4 ... m = y^(1/4) y = n^3 ... n = y^(1/3) m n = y^[(1/4) + (1/3)]
  62. 6th grade math

    5 t + 7 c = 1210 t = 3 c substituting ... 5 (3 c) + 7 c = 1210 ... 22 c = 1210 solve for c , then substitute back to find t ann needs ... 8 t + 4 c
  63. math

    an assumption is made that they each drive at some constant speed Mickey ... 40 mi in 4/5 hr ... 40 / (4/5) = 50 mph Dylan reached the city when Mickey had driven 200 mi ... in 4 hr at 50 mph Dylan drove 240 mi in 4 hr ... speed = distance / time
  64. geometry

    1) there are mixed units ... inches and feet ... convert to one or the other and recalculate 2) yes 3) yes ... like a fraction , the answer can be reduced 4) close ... try again ... 4 / 13 = 2 / 6 ??
  65. math

    8 b + 7 c + 10 m = 667000 b + c + m = 76000 b + c = m = 38000 8 b + 7 c = 667000 - 10 m = 667000 - 380000 = 287000 7 b + 7 c = 7 * 38000 = 266000 subtracting equations ... b = 287000 - 266000
  66. math

    p - w = 240 / 1.5 p + w = 240 / 1 adding equations ... 2 p = 400 solve for p , then substitute back to find w
  67. Algebra

    a = 10000 [1 + (.085 / 4)]^(3 * 4)
  68. math

    3 card combinations ... 52C3 black 3 card combinations ... 26C3 red 3 card combinations ... 26C3 probability not same color = 1 - (probability of same color) = 1 - [(2 * 26C3) / 52C3]
  69. stats

    the height range is from 7/18 s.d. below the mean to 3/18 above the mean a z-score table will show the portion of the population that lies in this range ... the portion is equivalent to the probability
  70. math

    how big is the shed?
  71. Math for 6th Grade

    w * 120% = 90 ... w * 1.2 = 90 ... w = 90 / 1.2
  72. MATH

    blatant cheating ... sounds serious ... just curious ... what course is this? ... what text? ... are the answers correct? is someone having a laugh at others' expense?
  73. MATH

    sure ... why not?
  74. Mathematics

    disregard my 1st response
  75. Mathematics

    11 differences ... 75 - 31 = 44 ... 44 / 11 = 4 difference between adjacent rows is 4 find first row and last row ... add them ... multiply by half the number of rows
  76. Mathematics

    11 differences ... 75 - 31 = 44 ... 44 / 11 = 4 difference between adjacent rows is 4 find first row and last row ... average them ... multiply by half the number of rows
  77. Algebra

    distribute over the value in parentheses then add like quantities
  78. math

    b + p + m = 734.4 m = b / 4 ... b = 4 m p = m / 3 ... m = 3 p ... b = 12 p substitute to find the solution
  79. Math

    half tank plus quarter tank equals three-quarters tank 3/4 t = 24 ... t = ?
  80. Math

    total momentum is constant in the system the sum of the initial momenta equals the sum of the final momenta find the total and subtract the larger mass after the collision
  81. math

    then your answer is correct
  82. math

    no ... none of the choices are correct check the transcription of the problem
  83. Math

    are you aware of PEMDAS? ... order of operations none of the offered solutions are correct ... maybe missing parentheses?
  84. science

    there is acceleration in the vertical direction due to the force of gravity ... so vertical velocity changes there is no horizontal acceleration ... so horizontal velocity remains constant
  85. Math

    yes
  86. Math

    left and right? i vote for B
  87. Math

    he passes when they are at the same distance ... 10 is correct
  88. Algebra II

    5850 = 4300 e^(8r) ... ln(5850/4300) = 8 r 5850 = d e^(17r)
  89. Algebra

    10^1.0414 = 11
  90. Algebra

    343 = 7^3 loga(343) = 3 loga(7)
  91. Algebra

    a = 480 [1 + (.09 / 4)]^(4 * 8)
  92. math

    158/3 * 4/3 = 632/9 = what mixed number?
  93. 6th grade math

    there are 5 choices for the 1st (leftmost) digit ... a "leading" zero is not standard form 5 choices for the 2nd digit ... zero is available 4 choices for the 3rd digit 5 * 5 * 4 = ?
  94. Math

    let x equal amount of milk chocolate (25 * 5.5) + (x * 2.9) + [(25 - x) * 4.4] = 50 * 4.5
  95. Math

    [(x-2) / x] + 3/2 = x / (x-2) 2(x-2)^2 + 3x^2 - 6x = 2x^2 2x^2 - 8x + 8 + 3x^2 - 6x = 2x^2 ... 3x^2 - 14x + 8 = 0 there is one positive solution ... 2/4 + 3/2 = 4/2
  96. Science

    angular velocity is in ... radians per second ... rad/s there are 2? radians in one revolution for angular velocity, the length of the radius is immaterial
  97. Math

    yes
  98. binomial probability

    probability of prime (1, 2, 3, 5) ... 4/6 = 2/3 ... not prime, composite (4, 6) ... 2/6 = 1/3 (p + n)^6 = p^6 + 6 p^5 n + 15 p^4 n^2 + 20 p^3 n^3 + ... probability 3 prime and 3 not ... 20 * (2/3 * 1/3)^3
  99. Logarithms

    squaring a value doubles the log
  100. Algebra 2

    r = (300 - 15 n) (5 + .50 n) = 1500 + 75 n - 7.5 n^2 the max is on the axis of symmetry ... n = -b / (2 a)