# 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?

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

-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

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

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

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