R_scott

Most popular questions and responses by R_scott
  1. Statistics

    the z-score of a sample is the number of standard deviations its thickness is from the mean thickness calculate the z-scores , then use a z-score table to find the probabilities

    posted on April 21, 2019
  2. Physics

    r1 = [(r1 + r2) * r3] / (r1 + r2 + r3) plug in values and solve for r3

    posted on April 21, 2019
  3. Physics

    2Ω in series with 3Ω is equivalent to 5Ω so the two parallel branches have the same resistance and current current = voltage / resistance

    posted on April 21, 2019
  4. science

    2/3 * Dw = 1/2 * D?

    posted on April 20, 2019
  5. algebra

    h = -1/2 g t^2 Vo t + Ho g is gravitational acceleration ... 32 ft/s^2 Vo is initial velocity .. 4 ft/s Ho is initial height ... 0

    posted on April 20, 2019
  6. Chemistry

    heat lost by silver = heat gained by water heat change = mass * specific heat * temperature change

    posted on April 19, 2019
  7. Science

    mass = weight / g

    posted on April 18, 2019
  8. math

    looks good

    posted on April 18, 2019
  9. Physics

    A) k = m g / x = 5.0 * 9.8 / .20 N/m B) find the work done (energy) in stretching the spring from .20 m to .80 m ... 1/2 k x^2 ... for each position the work is energy stored in the spring ... when the mass is released, the stored energy accelerates it

    posted on April 18, 2019
  10. Math

    85 kph * sin (45º) = 550 kph * sin(Θ) Θ is the angle west of north

    posted on April 18, 2019
  11. Stats

    so close to zero that you couldn't tell the difference ... unless, of course, you mean seconds instead of minutes 110 seconds is one second above one standard deviation from the mean find the z-score (number of standard deviations from the mean) ... and

    posted on April 17, 2019
  12. chemistry

    P1 * V1 / T1 = P2 * V2 / T2 change ºC to ºK and plug in the values

    posted on April 17, 2019
  13. physics

    force (weight) is the product (multiplication) of the pressure and the area

    posted on April 17, 2019
  14. Biology

    "b" indicates an "x" chromosome carrying the recessive the father is ... xY , and the mother is ... xX the Punnett square gives ... xx , xY , Xx , XY ... all with equal probability xx - color blind female xY - color blind male Xx - female "carrier" - has

    posted on April 17, 2019
  15. math

    s * (single game price) < (box season game price) dividing ... s < (box season game price) / (single game price)

    posted on April 17, 2019
  16. math

    4 w + 3 b = $10.94 ... 8 w + 6 b = $21.88 3 w + 6 b = $11.28 solve the system ... elimination looks good

    posted on April 16, 2019
  17. math

    henry2 20*10^18 ≠ 20^18

    posted on April 15, 2019
  18. Calculus

    4 s + L = 112 ... L = 112 - 4 s v = s^2 * L = s^2 (112 - 4 s) = - 4 s^3 + 112 s find the local max v

    posted on April 15, 2019
  19. math

    2^18 * 10^18 ... 2^8 * 2^10 * 10^18 ... 256 * 1024 * 10^18

    posted on April 15, 2019
  20. Science

    Kaitlyn (and you) are both in error that's one down and three to go

    posted on April 15, 2019
  21. Math

    π * r^2 = 188

    posted on April 15, 2019
  22. Technology

    people's ideas ... things that are patented or copyrighted devices, software, music, movies, etc

    posted on April 15, 2019
  23. Science

    wavelength and frequency are inversely related frequency and energy are directly related (Planck equation) gamma rays are high energy ... nuclear explosions are a source

    posted on April 15, 2019
  24. Physics

    120 * (2850 / 95)

    posted on April 15, 2019
  25. Physics

    momentum is conserved ... Mw * Vw = Ms * Vs the squid expels water equal to half of its own mass so the squid's velocity will be half of the water's velocity

    posted on April 15, 2019
  26. Physics

    wavelength = speed / frequency

    posted on April 14, 2019
  27. physics

    forces in opposite directions subtract from each other so the "effective forces here are ... 6N north and 2N east magnitude ... √(6^2 + 2^2) direction ... [arctan(2 / 6)] east of north

    posted on April 14, 2019
  28. BASIC TECHNOLOGY

    in the gear system ... teeth * rotation speed = constant

    posted on April 14, 2019
  29. physics

    remember to deduct the work done by the wind 63 m * 200 N * cos(20º)

    posted on April 14, 2019
  30. math

    each year, the amount remaining is 76% of the previous year ... 100% - 24%

    posted on April 14, 2019
  31. Science

    read the 1st sentence ... then try again

    posted on April 12, 2019
  32. Math

    1st one needs work p v = k ... as volume goes up , pressure goes ?

    posted on April 12, 2019
  33. math

    h + t + u = 9 2 t = h + u solve for t

    posted on April 12, 2019
  34. Math

    1470 = [s - (s / 8) - (7s / 24)] / 4 solve for s (salary)

    posted on April 12, 2019
  35. Physics

    a) f * d = 1500 N * 3 m = 4500 J b) 4500 J - m g h = 4500 J - (350 kg * 9.8 m/s^2 * .81 m)

    posted on April 12, 2019
  36. Calculus

    n = .abcabcabc… multiplying ... 1000 n = abc.abcabcabc… subtracting ... 999 n = abc dividing ... n = abc / 999 curious as to which answer your teacher thought was correct

    posted on April 11, 2019
  37. math

    there are 58 total pieces (20 + 38) ... what fraction are pins?

    posted on April 11, 2019
  38. Math

    let n equal ones digit and t equal tens digit t + n = 10 10 t + n + 54 = 10 n + t solve the system of equations ... substitution looks like a good method

    posted on April 11, 2019
  39. algebra

    1500 * (1 + .12)^7

    posted on April 11, 2019
  40. Chemistry

    p v = n r t convert ºC to ºK ... dm³ = L use the value of r with the correct units solve for n ... moles of chlorine ... remember , chlorine gas is diatomic

    posted on April 10, 2019
  41. Math

    looks good

    posted on April 10, 2019
  42. physics

    try googling Hooke's law

    posted on April 10, 2019
  43. Physics

    momentum is conserved ... but you need the mass of the truck to give an exact answer

    posted on April 10, 2019
  44. chemistry

    6.2 mol / 1.35 mol/L

    posted on April 10, 2019
  45. Physics

    v * 9.0 = 27.0 + (v * 1.2)

    posted on April 9, 2019
  46. Algebra

    find the slopes of the lines parallel lines have the same slope perpendicular lines have slopes that multiply to -1

    posted on April 8, 2019
  47. math

    move the decimal point to the right, until it is on the right of a non-zero digit the number of places the decimal point is moved, ... is the negative exponent of ten in the scientific notation

    posted on April 8, 2019
  48. Math

    [5 + 5 + 2(t - 1)] * t/2 = 480 (4 + t) * t = 480 t^2 + 4t - 480 = 0

    posted on April 8, 2019
  49. math

    try it ... y can be any value

    posted on April 7, 2019
  50. pre-calculus

    center of wheel is 36m high ... (70 / 2) + 1 how much time >8m above center? draw a sketch ... diameter is horizontal at 36m ... 8m perpendicular from diameter to edge of wheel ... sine of central angle is ... 8 / 35 180º plus twice central angle is

    posted on April 7, 2019
  51. physics

    find the volume of water per second ... a cylinder with a 7 cm diameter and a 33 m length ... convert to mass of water find energy (work) ... work = m g h work / time = power ... Joules / sec = watts

    posted on April 7, 2019
  52. Math - Plz help!!!

    perimeter is two lengths plus two widths ... P = 2 L + 2 W The length is 2.3 meters longer than the width ... L = W + 2.3 ...substitute for the length 53 = 2 (W + 2.3) + 2 W = 4 W + 4.6 solve for W , then substitute back to find L

    posted on April 7, 2019
  53. Math

    divide the 1st order terms' coefficients by 2, and square the results x^2 - 4 x + (-4/2)^2 + y^2 + 6 y + (6/2)^2 = (-2)^2 + 3^2 (x - 2)^2 + (y + 3)^2 = 13

    posted on April 6, 2019
  54. Math

    1/2 * 1/2 * 1/2 * 1/2 = ?

    posted on April 4, 2019
  55. Math

    each flip is an independent event ... with the probability of heads being 1/2 the probability of multiple independent events is ... the product of their individual probabilities

    posted on April 4, 2019
  56. Science Help

    all the planets have elliptical orbits ... with varying amounts of eccentricity (elliptical-ness) the eccentricity of the Earth's orbit is very low ... the orbit is very close to circular

    posted on April 4, 2019
  57. Chem

    {2.32 / [molar mass Al(OH)3(s)]} * 3 = moles (OH⎺) each mole of OH⎺ needs one mole of HCl to neutralize it

    posted on April 4, 2019
  58. Calculus

    i refer you, again, to ... x^2 + y^2 = r^2 1^2 + (-√3)^2 = 1 + 3 = 4 = r^2 only one answer fits

    posted on April 4, 2019
  59. physics

    umm ... the level started at 12 cm volume = (14 - 12) * 10 * 10

    posted on April 4, 2019
  60. Calculus

    x^2 + y^2 = r^2

    posted on April 4, 2019
  61. Physics

    angular momentum is conserved angular momentum = moment of inertia * rotational speed

    posted on April 4, 2019
  62. math

    by inspection , 15 is the average of 20 and 10 ... so, equal amounts of the two with algebra ... .20 x + .10(1200 - x) = .15 * 1200

    posted on April 4, 2019
  63. Science

    find the flight time ... 0.62 = 1/2 g t^2 use the time (t) to find the horizontal distance ... d = 0.61 t

    posted on April 3, 2019
  64. science

    the force is inversely proportional to the square of the distance

    posted on April 3, 2019
  65. physics

    frequency is proportional to the √ of the tension

    posted on April 3, 2019
  66. Probability

    let a = k3 , b = k5 , c = k7.50 b = 3 a c = b + 500 3 a + 5 b + 7.5 c = 42225 substituting ... 3(b / 3) + 5 b + 7.5(b + 500) = 42225 solve for b , then substitute back to find a and c

    posted on April 2, 2019
  67. math

    r^(5 - 2) = 48 / 6 ... r^3 = 8 ... r = 2 An = 3 * 2^(n-1)

    posted on April 2, 2019
  68. chemistry

    500mL of 3M HCl contains 1.5 moles of HCl so 129.31 mL of the 11.6 M acid is needed acid is added to water (NOT vice versa) using a volumetric cylinder, add the necessary acid to 350 ml of water ... then add more water to make the 500 mL of solution

    posted on April 1, 2019
  69. math

    14^2 = ? ? / 90 = !

    posted on April 1, 2019
  70. Science

    more work needed are you clear on homozygous vs heterozygous?

    posted on April 1, 2019
  71. physics

    the hot water looses heat , and the bath water gains heat [80.0ºC - (final temp)] * 2.00 kg = [(final temp) - 27.0ºC] * 20.0 kg

    posted on April 1, 2019
  72. Physics: Newton's Second Law

    use ... f = m a ... on the 3 kg car ... the f is the tension

    posted on March 30, 2019
  73. math

    his weight is not a factor the free fall equation is ... h = -1/2 g t^2 + Vo t + Ho ... h is height , g is gravitational acceleration ... Vo is initial velocity , Ho is initial height h = 0 at the bottom , g = 32 ft/s^2 0 = -16 t^2 + 0 t + 5996 solve the

    posted on March 29, 2019
  74. science

    energy = mass * (specific heat) * (temperature change) 800 J = 1 kg * (specific heat) * (30 ºC - T) there are many types of glass , each with is own specific heat ... find a workable value and use it ... make sure the units include Joules and ºC

    posted on March 29, 2019
  75. Accounting

    (final amount) = (initial amount) * [1 + (interest rate)]^(years) ... = 800 * (1 + .08)^3 gain = final - initial

    posted on March 28, 2019
  76. Physics

    1/9 of the copper's mass is "supported" by the water tension = 8/9 * g * 0.5 kg ... Newtons

    posted on March 28, 2019
  77. pre algebra

    the function rule tells you how to get y from x x is increasing by 2, while y decreases by 1 ... this means the slope is -1/2 try some values to see if you can find the y-intercept

    posted on March 27, 2019
  78. physics

    mass1 * (distance1 from CG) = mass2 * (distance2 from CG) distance1 + distance2 = 0.20 m

    posted on March 27, 2019
  79. physics

    the black ball's initial momentum is now shared by both balls find the initial momentum (it is conserved) use the combined mass to find the new velocity

    posted on March 27, 2019
  80. math

    the 8 hours of overtime resulted in 12 hours pay normal rate = 650 / (40 + 12)

    posted on March 26, 2019
  81. Math

    given??

    posted on March 26, 2019
  82. Math

    plug in the x and y values for each pair , and see which one works ... makes the equation true

    posted on March 26, 2019
  83. Chemistry

    6M means 6 moles in one liter of solution 100ml is a tenth of a liter , so you use 6/10 of a mole of NaOH measure .6 moles of NaOH ... molar mass * .6 use a graduated container ... add about 60 or 70 ml of water ... add NaOH and dissolve completely ... add

    posted on March 25, 2019
  84. Chemistry

    find the number of moles ... mass / molar mass ... this is n p v = n r t ... choose the proper r value based on the units ... ºC, atm ... you will probably have to convert ºC to ºK

    posted on March 25, 2019
  85. math

    let x = smaller , y = larger y - x = 3 ... y - 3 = x y^2 + x = 417 solve the system

    posted on March 24, 2019
  86. Math

    look at the 1st one again

    posted on March 24, 2019
  87. Science

    assign the initial path of A as either the x or y direction find the initial momentum of A in the x and y directions ... then, find the final momentum of A in the x and y directions ... the difference, in x and in y, is the momentum imparted to B use B's x

    posted on March 24, 2019
  88. Physics

    find the initial momentum of A in the x and y directions ... then, find the final momentum of A in the x and y directions ... the difference, in x and in y, is the momentum imparted to B use B's x and y momenta to find its final velocity

    posted on March 24, 2019
  89. Science

    google ... how-do-you-calculate-freezing-point-depression

    posted on March 22, 2019
  90. math/pre-calc

    tmax lies on the axis of symmetry of the parabola ... -b / 2a ... -100 / (2 * -4.9)

    posted on March 22, 2019
  91. Science

    a few need rework ... gravity seems to be a theme here Tides are caused by A) gravity. B) heat. C) waves.

    posted on March 22, 2019
  92. Physics

    final energy = initial energy + energy from gravity 1/2 m Vf^2 = 1/2 m 16.0^2 + (m * 9.8 * 27.5) Vf^2 = 256 + (2 * 9.8 * 27.5)

    posted on March 21, 2019
  93. Math

    yd^3 = 27 ft^3 3 ft^3 / (4 * 27 ft^3) = ?

    posted on March 20, 2019
  94. Precalculus

    9/365 * 2 * π * 93 million

    posted on March 20, 2019
  95. math

    1 foot by 1 1/2 foot

    posted on March 20, 2019
  96. Math

    find the rate of fall ... (change in altitude) / (change in time) ... this is the slope of the line ... y = m x + b plug in one of the time/altitude points to find the y-intercept (b)

    posted on March 20, 2019
  97. Quadratics

    you have three equations and three unknowns ... the unknowns are ... a, Vo, and So 144 = 1/2 a (.5^2) + Vo .5 + So 152 = 1/2 a (1^2) + Vo 1 + So 128 = 1/2 a (2.5^2) + Vo 2.5 + So solve the system for a, Vo, and So ... use the resulting equation to find max

    posted on March 20, 2019
  98. Math- Algebra

    revenue = (500 - 20 x)(45000 + 5000 x) ... = 22500000 +1600000 x - 100000 x^2 xmax = -1600000 / (2 * -100000)

    posted on March 20, 2019
  99. Math

    L + 2 W = 120 ... L = 120 - 2W area = L * W = (120 - 2W) * W = 120 W - 2 W^2 the maximum is on the axis of symmetry ... -b / 2a Wmax = -120 / (2 * -2) substitute back to find Lmax

    posted on March 20, 2019