kuai

Most popular questions and responses by kuai
  1. Algebra

    Hank and Rashad are walking the Appalachian Trail from Maine southward through Maryland for a distance of 1164 miles. They have walked three times as many miles as they have remaining. How many miles are there remaining for them to walk?

    asked on May 24, 2014
  1. Math

    Cos = sin(90 - 2x) Sin(x + 60) = sin(90 - 2x) x + 60 = 90 - 2 x 3x + 60 = 90 3x = 30 x = 10 Tan(x + 60) tan(10 + 60) tan(70) = 2.747

    posted on February 5, 2019
  2. algebra

    -3x-4y =20 x-10y= 16 -3x -4y = 20 3x -30y = 48 -34y = 68 y = -2 x - 10(-2) = 16 x + 20 = 16 x = -4

    posted on October 6, 2018
  3. Math

    -16(t^2-4t-12) =0 (t-6)(t+2) =0 t - 6 = 0 t = 6

    posted on October 30, 2016
  4. Math

    x^2 -25 =0 (x -5)(x+5) =0

    posted on October 16, 2015
  5. Intermediate Algebra for College

    y = 0 0= .25x + 15 -15 = .25x x = -60 x =0 y= .25(0) + 15 y = 15 Slope is .25 (-60,0),(0,15)

    posted on October 16, 2015
  6. statistics

    alpha = a= 0.05 Z0.025 = 1.96 p = 0.5 q = 1-p = 0.5 E = 0.05 Effect size = 384.16 n = 385

    posted on June 9, 2014
  7. statistics

    P(x < 113) mean = 125 Standard deviation = sqrt(variance) Standard deviation = 5 z = (113-125)/5 z = -12/5 z = -2.4 P ( z < -2.4) = 0.0082

    posted on June 3, 2014
  8. math pls help!!!!!

    1. C 2. D 3. B 4. A

    posted on May 31, 2014
  9. Statistics 1

    z = (score -mean)/sd z = (2500 -2500)/500 z = 0 is 50%

    posted on May 31, 2014
  10. Math

    (x + 79 + 84 + 68)/4 = 80 (x + 231)/4 =80 x +231 = 320 x + 231- 231 = 320-231 x = 89 Fourth test 89

    posted on May 24, 2014
  11. algebra

    x = liters of 37% acid solution Other = (50 - x) = liters of 27% solution 37x + 27*(50 - x) = 50*36 37x + 1350 - 27x = 1800 10x = 450 x = 45 liters 45 liters of 37% acid and 5 liters of 27% acid.

    posted on May 23, 2014
  12. math

    Adult: a Children: c a + c = 450 70a + 40c = 27750 Substitute c = 450 -a 70a + 40(450 - a) = 27750 70a + 18000 -40a = 27750 30a + 18000 = 27750 30a + 18000- 18000= 27750-18000 30a = 9750 30a/30 = 9750/30 a = 325 c = 450 -a c = 450-325 c = 125

    posted on May 21, 2014
  13. Math Help!

    1. 2x(10x) = 20x^2 2. You can check because if -3m(m + 8) -3m(m-8) = -3m^2 + 24m 3. 4d(2d - 9) = -8d^2 - 36d

    posted on May 21, 2014
  14. Algebra

    13a + 9b -2a -4b 13a -2a + 9b - 4b = 11a + 5b

    posted on May 21, 2014
  15. Statistics/Probability

    Exp = 1(.35) + 2(.4) + 3(.1) + 4(.15) = .35 + .8 + .3 + .6 = 2.05 Variance = 1^2 (.35) + 2^2(.4) + 3^2(.1) + 4^2(.15) = .35 + 1.6 + .9 + 2.4 = 5.25 Sd = sqrt(5.25-(2.05)^2) = 1.02

    posted on May 21, 2014
  16. statistic

    Phat = 500/1200 phat =0.4167 E = 1.96 * sqrt(.4167*.5833/1200) E = 0.0279 0.4167 -+ 0.0279 [0.3888, 0.4446]

    posted on May 21, 2014
  17. Maths (Integration)

    (1+x/x^3)dx = x -1/x + c

    posted on May 21, 2014
  18. math 8th grade

    -15- (3-7) + 6 *(-2) +(-8) -9 = -15-(-4) +(-12) - 8 -9 =-15 + 4 -12 -8 -9 = -11 -12 -8 -9 =- -40

    posted on May 21, 2014
  19. Math 8th Grade!!!!

    27 -18/3 * (-4)-0-33-(-39) 27-6* (-4) - 0 - 33 -(-39) =27 + 24 -0 -33 + 39 =51-33 + 39 = 5$

    posted on May 21, 2014
  20. statistics

    80 * .2 16

    posted on May 20, 2014
  21. math--check my answer

    37, 38, 39, 41, 43, 47, 52, 54 Yes

    posted on May 20, 2014
  22. Stats Psychology

    6 * 10 = 60 (60-y)/9 = 5 60-y = 45 60-45 = y 15 = y The value of the score that was removed 15

    posted on May 20, 2014
  23. Algebra

    Z = (score-mean)/SD -1.7 = (13-18.1)/SD -1.7 = -5.1/SD -1.7SD = -5.1 SD = -5.1/-1.7 SD = 3.0

    posted on May 19, 2014
  24. algebra

    Oj: x Apple juice: (8-x) .25x + .75(8-x) = .4(8) .25x + 6 -.75x = 3.2 6 -0.5x = 3.2 -.5x = 3.2-6 -.5x = -2.8 x = 5.6

    posted on May 19, 2014
  25. Statictics

    Mean = np = 25(.2) = 5 Standard deviation = sqrt((25 * .2*.8)) = 2

    posted on May 19, 2014
  26. MATH HELP ASAP

    B

    posted on May 19, 2014
  27. Algebra

    A = p( 1 + r/n)^t*n t = 3.5*2 = 7 r = 0.08/2 = 0.04 A = 25000( 1+ 0.04)^7 A = 25000( 1.04)^7 A = $32,898.29

    posted on May 19, 2014
  28. math

    y = mx + b f(x) = 2m + b = 1 f(x) = 4m + b = 0 f(x) = 6m + b = -1 -1(2m + b = 1) 4m + b = 0 -2m -b = -1 4m + b = 0 2m = -1 m = -1/2 2(-1/2) + b = 1 -1 + b = 1 -1+ 1 + b = 1 + 1 b = 2 y = mx +b y = -1/2x + 2

    posted on May 19, 2014
  29. math

    c = 10n + 26 n = 27 n = 39 n = 43 c = 10 ( 27) + 26 c = 270 + 26 c = 296 so you can finish the rest.

    posted on May 19, 2014
  30. statistics

    20/36

    posted on May 18, 2014
  31. statistics

    (1- .98)/2 = .01 = 2.33

    posted on May 18, 2014
  32. algebra/stressed

    There is typo for simple interest Simple interest. =Prt = 32500(.069)(3) =$6,727.50 Amount. = p + interest A = $ 32500 + $6727.50 A = 39,227.50

    posted on May 17, 2014
  33. algebra/stressed

    a) annually A = p(1+ r)^t A = 32500(1+ 0.069)^3 A = 32500(1 .069)^3 A = $39,702.37 b) semiannually A = p(1+ r/n)^tn A = 32500(1 + 0.069/2)^(3*2) A = 32500(1.0345)^6 A = $39,835.14 c) quarterly A = p(1+ r/n)^tn A = 32500( 1+ 0.069/4)^(3*4) A =

    posted on May 17, 2014
  34. Algebra

    A = p(1 + r)^t 60000 =p(1.03)^30 60000 = 2.427262471p P = $24719.21

    posted on May 17, 2014
  35. Statistics

    Range = max -min Range =102 -77 Range = 25 Standard deviation = 8.56

    posted on May 16, 2014
  36. ALGEBRA

    mean = 9.3, median = 10, mode = 13

    posted on May 15, 2014
  37. Statistics

    n = (z/2 )^2 * pq/E^2 n = (1.96)^2 *0.82*0.18/0.04^2 n = ?

    posted on May 14, 2014
  38. Algebra ck to see if I did it correclty please

    6^x = 6^2 x = 2 2^x = 2^2 x = 2 3^x = 3^4 x = 4 ok

    posted on May 13, 2014
  39. Math

    m = (-20-(-11))/(5-2) m = -9/3 m = -3 y -(-11) = -3(x -2) y + 11 = -3x + 6 y + 11 -11 = -3x + 6 -11 y = -3x - 5

    posted on May 13, 2014
  40. Geometry

    Yes

    posted on May 13, 2014
  41. Algebra 1 Answer Evaluation

    (x - 3)^2 = 22 x - 3 =-+√(22) 3-√(22), 3+√(22)

    posted on May 13, 2014
  42. algebra

    P(1+ r/n)^tn 8000(1+.12/2)^2*2 8000(1.06)^4 =?

    posted on May 13, 2014
  43. Algebra

    6^x = (1/6)^2 6^x = 6^-2 x = -2 3^x = 8 Log3^x = log8 x log3 = log8 x = log8/log3

    posted on May 13, 2014
  44. Math

    bracelet = x Necklace = 5x x + 5x = 192 6x = 192 6x/6 = 192/6 x = 32 Necklace = 5x = 5(32) = 160

    posted on May 13, 2014
  45. Algebra

    y-1/x+3=-3/4 y-1/x+ 1/x + 3-3 = -3/4 + 1/x -3 y - 0 + 0 = -3/4 - 3 + 1/x y = (-3 - 12)/4 + 1/x y = -15/4 + 1/x

    posted on May 13, 2014
  46. Math Help

    A = l*w l = 2w -1 120 = (2w-1)w 120 = 2w^2 -w 2w^2 -w -120 = 0

    posted on May 13, 2014
  47. math

    Adult: x Student: y x + y = 90 12x+ 8y = 980 12x +8(90-x) = 980 12x + 720 -8x = 980 4x = 260 x = 65 y = 25

    posted on May 12, 2014
  48. Math

    0/2, 4/12, 2/3, 5/6, 9/9

    posted on May 12, 2014
  49. Economics (42)

    You're welcome.

    posted on May 12, 2014
  50. Algebra

    A = LW L = w-1 120 =(w-1)w 120 = w^2-w w^2-w-120 =0

    posted on May 12, 2014
  51. Pre-algebra

    P=2l+2w 70 = 2(17) + 2w 70 = 34 +2w 70-34 = 34-34 +2w 36 = 2w w = 18

    posted on May 12, 2014
  52. Economics (36)

    a. What is the probability that the debt for a randomly selected borrower with good credit is more than $18,000 (to 4 decimals)? p(x > 18000) z = ( x - μ ) / σ z = (18000 -15015)/3730 z =2985/3730 = 0.8 P( z > 0.8) = 1-.7881= 0.2119 b. What is the

    posted on May 12, 2014
  53. Economics (42)

    n=20, xbar= 126, s=63.94 a=0.05, |t(0.025, df=n-1=19)|= 2.09 So 95% CI is xbar ± t*s/√n 126 ± 2.09*63.94/√(20) (96.1, 155.9)

    posted on May 12, 2014
  54. Math

    A) $1629.53 x 0.195 x 21/365 = $18.28 B) $2639. 99 * .2295 * 30/365 = $49.80

    posted on May 12, 2014
  55. Math

    Ok

    posted on May 11, 2014
  56. Math

    y = mx + b f(x) = 2m + b = 1 f(x) = 4m + b = 0 f(x) = 6m + b = -1 -1(2m + b = 1) 4m + b = 0 -2m -b = -1 4m + b = 0 2m = -1 m = -1/2 2(-1/2) + b = 1 -1 + b = 1 -1+ 1 + b = 1 + 1 b = 2 y = mx +b y = -1/2x + 2

    posted on May 11, 2014
  57. math

    67=(3-6x)/4.13 67(4.13) = 4.13(3-6x)/4.13 276.71 = 3-6x 273.71 = -6x x = 273.71/-6 x = -45.618

    posted on May 11, 2014
  58. Math

    y = mx + b f(x) = 4m + b = 2 f(x) = m + b = -4 4m + b = 2 -m -b = 4 3 m = 6 m = 2 4(2) + b = 2 8 + b = 2 b = -6 y = 2x - 6

    posted on May 11, 2014
  59. Stats

    n = [(z-value * sd)/E]^2 n =[ (2.575 * 42)/3]^2

    posted on May 10, 2014
  60. MAth

    4. (1-5)/(3-6) = 4/3 5. (-6-(-5)/(-3-(-3) -1/0 Undefined

    posted on May 10, 2014
  61. algebra

    x = 7-(1/8)y x-7 = -1/8y -8x+56 =y

    posted on May 10, 2014
  62. Economics (41)

    A) z = 1.96 n = 60 x-bar = 96 S = 16 SE = σ/√n = 16/√60 xbar ± z*s/√n 96 ± 4.048 ( 92.0, 100.0) B) z = 1.96 SE = σ/√n = 16/√120 96 - 2.867, 96 + 2.867 (93.1, 98.9)

    posted on May 9, 2014
  63. Economics (41)

    I did not know how to do it.

    posted on May 9, 2014
  64. Economics (41)

    Only c is correct

    posted on May 9, 2014
  65. Economics (45)

    The 2003 Statistical Abstract of the United States reported the percentage of people 18 years of age and older who smoke. Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of

    posted on May 9, 2014
  66. Economics (39)

    39) Suppose a random sample of size 40 is selected from a population with σ = 9. Find the value of the standard error of the mean in each of the following cases (use the finite population correction factor if appropriate). a. The population size is

    posted on May 9, 2014
  67. Economics (40)

    A market research firm conducts telephone surveys with a 42% historical response rate. What is the probability that in a new sample of 400 telephone numbers, at least 150 individuals will cooperate and respond to the questions? In other words, what is the

    posted on May 9, 2014
  68. Economics (37)

    37) According to the Sleep Foundation, the average night's sleep is 6.8 hours (Fortune, March 20, 2006). Assume the standard deviation is .7 hours and that the probability distribution is normal. a. What is the probability that a randomly selected person

    posted on May 9, 2014
  69. Math

    .8/1.6 = .5 .4/.8 = .5 .2/.4 = .5 Constant Geometric

    posted on May 9, 2014
  70. Algebra

    Let t = time required by the larger pipe alone then 3t = time required by the smaller pipe alone Let the completed job = 1; (a full tank) Each pipe will fill a fraction of the tank, the two fractions add up to 1. 9/t + 9/3t = 1 27 + 9 = 3t 36 = 3t 12 = t

    posted on May 9, 2014
  71. math

    y = mx + b f(x) = 2m + b = 1 f(x) = 4m + b = 0 f(x) = 6m + b = -1 -1(2m + b = 1) 4m + b = 0 -2m -b = -1 4m + b = 0 2m = -1 m = -1/2 2(-1/2) + b = 1 -1 + b = 1 -1+ 1 + b = 1 + 1 b = 2 y = mx +b y = -1/2x + 2

    posted on May 9, 2014
  72. Calculus

    (1/3x^3)-x^2+x-1 when x=1 F'(x) = x^2 -2x + 1 F'(1) = 1-2+ 1 = 0 f(x) = 1/3-1+ 1 -1 f(x) =( 1-3+3-3)/3 f(x) = -2/3 y - (-2/3 ) = 0(x -1) y + 2/3 = 0 y = -2/3

    posted on May 9, 2014
  73. Algebra

    -1/3 > -3

    posted on May 8, 2014
  74. math

    Ho: u1-u2 = 0 Ha: u1-u2 is not 0 test-statistic = -3.8563 p-value = 0.00038 df = 43 Conclusion:Since p-value is less than alpha=5%, Reject Ho. There is at difference in the average cost of couches at these two stores.

    posted on May 8, 2014
  75. Math

    Yes total bands: 185 P(pink) = 95/185 = 19/37 P(brown) = 90/185 =18/37

    posted on May 8, 2014
  76. math

    9x - 7y =4 -7y = -9x + 4 y = 9x/7 - 4/7 Slope of line parallel: 9/7 Slope of line perpendicular: -7/9

    posted on May 8, 2014
  77. math

    (a^4b^6)^0 = 1

    posted on May 8, 2014
  78. math

    =1/(-2x)^6 = 1/64x^6

    posted on May 8, 2014
  79. Algebra

    W=√1/LC W^2 = 1/LC LCW^2 = 1 L = 1/CW^2

    posted on May 8, 2014
  80. algebra

    Logb(a) = c Log1/5(25) = 2

    posted on May 8, 2014
  81. math

    Width of pool is x+3 Length of pool is 3x-4 Width of deck is 3x-2 Length of deck is 2x+6 area= (2x+6)(3x-2) - (3x-4)(x+3) = 6 x^2 + 14 x -12 -[ 3x^2 +5 x -12 ] = 3 x^2 + 9 x 110.4375

    posted on May 7, 2014
  82. math

    Wrong answer

    posted on May 7, 2014
  83. math

    90 minutes = 1.5 hrs 45 minutes = 0.75 hrs 8*5 - (1.5 + 0.75 + 2.5 ) 40 - 4.75 35.25 = 35 1/4 hours = 35 hours and 15 minutes

    posted on May 7, 2014
  84. math

    90 minutes = 1.5 hrs 45 minutes = 0.75 hrs 8*5 - (1.5 + 0.75 + 2.5 ) 40 - 4.75 35.25 = 35 1/4 hours = 35 hours and 15 minutes

    posted on May 7, 2014
  85. Statistics

    n = 30 x = 31.5 μ = 32 SEm = SD/√n SEm = 4/√30 SEm = 0.73 z = ( x - μ ) / SEm z = (31.5-32)/0.73 z = -0.68 P(z < -0.68) = 0.2483

    posted on May 7, 2014
  86. ALGEBRA

    • 13 in, 84 in, 85 in

    posted on May 7, 2014
  87. Math

    (2/5)(3/8) = 6/40

    posted on May 7, 2014
  88. Algebra

    (z + 3)(z +15)

    posted on May 6, 2014
  89. stat

    9C2(.17)^2(.83)^7

    posted on May 6, 2014
  90. algebra

    Let x: 5 bill let y: 10 bill x + y = 25 5x + 10y = 230 5x + 10(25-x) = 230 5x + 250 -10x = 230 -5x = -20 x = 4 y =21

    posted on May 6, 2014
  91. statistics 101 college

    phat = 8/28 = 0.286

    posted on May 6, 2014
  92. ALGEBRA

    1 -15 = 36x -72 -14 +72 =36x 58 =36x 58/36 = x 29/18 = x

    posted on May 5, 2014
  93. Algebra Question~!

    A= P(1+r)^t 16099.44= 15000(1+r)^2 16099.44/15000 = (1+r)^2 sqrt((16099.44/15000) = 1+ r sqrt(166099.44/1500) -1 = r r = 3.6%

    posted on May 5, 2014
  94. math

    850(1+.15/12)^48 = 1543.o516 Monthly payment 1543.0516/48 = $32..15

    posted on May 2, 2014
  95. math

    All correct except 5 #5 is d

    posted on May 2, 2014
  96. Math

    3x+6y=6 2x-3y=9 3x + 6y = 6 2(2x -3y =9) 3x + 6y = 6 4x -6y = 18 7x = 24 x = 24/7 y =-30/7

    posted on May 2, 2014
  97. Math

    -1(5x+7y=77 ) -5x -7y = -77 5x+3y=53 -4y = -24 y = 6 5x + 3(6) = 53 5x + 18 = 53 5x = 35 x = 7

    posted on May 1, 2014