Kuai
Most popular questions and responses by Kuai
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

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 
algebra
3x4y =20 x10y= 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 
Math
16(t^24t12) =0 (t6)(t+2) =0 t  6 = 0 t = 6
posted on October 30, 2016 
Math
x^2 25 =0 (x 5)(x+5) =0
posted on October 16, 2015 
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 
statistics
alpha = a= 0.05 Z0.025 = 1.96 p = 0.5 q = 1p = 0.5 E = 0.05 Effect size = 384.16 n = 385
posted on June 9, 2014 
statistics
P(x < 113) mean = 125 Standard deviation = sqrt(variance) Standard deviation = 5 z = (113125)/5 z = 12/5 z = 2.4 P ( z < 2.4) = 0.0082
posted on June 3, 2014 
math pls help!!!!!
1. C 2. D 3. B 4. A
posted on May 31, 2014 
Statistics 1
z = (score mean)/sd z = (2500 2500)/500 z = 0 is 50%
posted on May 31, 2014 
Math
(x + 79 + 84 + 68)/4 = 80 (x + 231)/4 =80 x +231 = 320 x + 231 231 = 320231 x = 89 Fourth test 89
posted on May 24, 2014 
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 
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= 2775018000 30a = 9750 30a/30 = 9750/30 a = 325 c = 450 a c = 450325 c = 125
posted on May 21, 2014 
Math Help!
1. 2x(10x) = 20x^2 2. You can check because if 3m(m + 8) 3m(m8) = 3m^2 + 24m 3. 4d(2d  9) = 8d^2  36d
posted on May 21, 2014 
Algebra
13a + 9b 2a 4b 13a 2a + 9b  4b = 11a + 5b
posted on May 21, 2014 
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 
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 
Maths (Integration)
(1+x/x^3)dx = x 1/x + c
posted on May 21, 2014 
math 8th grade
15 (37) + 6 *(2) +(8) 9 = 15(4) +(12)  8 9 =15 + 4 12 8 9 = 11 12 8 9 = 40
posted on May 21, 2014 
Math 8th Grade!!!!
27 18/3 * (4)033(39) 276* (4)  0  33 (39) =27 + 24 0 33 + 39 =5133 + 39 = 5$
posted on May 21, 2014 
statistics
80 * .2 16
posted on May 20, 2014 
mathcheck my answer
37, 38, 39, 41, 43, 47, 52, 54 Yes
posted on May 20, 2014 
Stats Psychology
6 * 10 = 60 (60y)/9 = 5 60y = 45 6045 = y 15 = y The value of the score that was removed 15
posted on May 20, 2014 
Algebra
Z = (scoremean)/SD 1.7 = (1318.1)/SD 1.7 = 5.1/SD 1.7SD = 5.1 SD = 5.1/1.7 SD = 3.0
posted on May 19, 2014 
algebra
Oj: x Apple juice: (8x) .25x + .75(8x) = .4(8) .25x + 6 .75x = 3.2 6 0.5x = 3.2 .5x = 3.26 .5x = 2.8 x = 5.6
posted on May 19, 2014 
Statictics
Mean = np = 25(.2) = 5 Standard deviation = sqrt((25 * .2*.8)) = 2
posted on May 19, 2014 
MATH HELP ASAP
B
posted on May 19, 2014 
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 
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 
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 
statistics
20/36
posted on May 18, 2014 
statistics
(1 .98)/2 = .01 = 2.33
posted on May 18, 2014 
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 
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 
Algebra
A = p(1 + r)^t 60000 =p(1.03)^30 60000 = 2.427262471p P = $24719.21
posted on May 17, 2014 
Statistics
Range = max min Range =102 77 Range = 25 Standard deviation = 8.56
posted on May 16, 2014 
ALGEBRA
mean = 9.3, median = 10, mode = 13
posted on May 15, 2014 
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 
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 
Math
m = (20(11))/(52) 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 
Geometry
Yes
posted on May 13, 2014 
Algebra 1 Answer Evaluation
(x  3)^2 = 22 x  3 =+√(22) 3√(22), 3+√(22)
posted on May 13, 2014 
algebra
P(1+ r/n)^tn 8000(1+.12/2)^2*2 8000(1.06)^4 =?
posted on May 13, 2014 
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 
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 
Algebra
y1/x+3=3/4 y1/x+ 1/x + 33 = 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 
Math Help
A = l*w l = 2w 1 120 = (2w1)w 120 = 2w^2 w 2w^2 w 120 = 0
posted on May 13, 2014 
math
Adult: x Student: y x + y = 90 12x+ 8y = 980 12x +8(90x) = 980 12x + 720 8x = 980 4x = 260 x = 65 y = 25
posted on May 12, 2014 
Math
0/2, 4/12, 2/3, 5/6, 9/9
posted on May 12, 2014 
Economics (42)
You're welcome.
posted on May 12, 2014 
Algebra
A = LW L = w1 120 =(w1)w 120 = w^2w w^2w120 =0
posted on May 12, 2014 
Prealgebra
P=2l+2w 70 = 2(17) + 2w 70 = 34 +2w 7034 = 3434 +2w 36 = 2w w = 18
posted on May 12, 2014 
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 
Economics (42)
n=20, xbar= 126, s=63.94 a=0.05, t(0.025, df=n1=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 
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 
Math
Ok
posted on May 11, 2014 
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 
math
67=(36x)/4.13 67(4.13) = 4.13(36x)/4.13 276.71 = 36x 273.71 = 6x x = 273.71/6 x = 45.618
posted on May 11, 2014 
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 
Stats
n = [(zvalue * sd)/E]^2 n =[ (2.575 * 42)/3]^2
posted on May 10, 2014 
MAth
4. (15)/(36) = 4/3 5. (6(5)/(3(3) 1/0 Undefined
posted on May 10, 2014 
algebra
x = 7(1/8)y x7 = 1/8y 8x+56 =y
posted on May 10, 2014 
Economics (41)
A) z = 1.96 n = 60 xbar = 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 
Economics (41)
I did not know how to do it.
posted on May 9, 2014 
Economics (41)
Only c is correct
posted on May 9, 2014 
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 
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 
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 
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 
Math
.8/1.6 = .5 .4/.8 = .5 .2/.4 = .5 Constant Geometric
posted on May 9, 2014 
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 
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 
Calculus
(1/3x^3)x^2+x1 when x=1 F'(x) = x^2 2x + 1 F'(1) = 12+ 1 = 0 f(x) = 1/31+ 1 1 f(x) =( 13+33)/3 f(x) = 2/3 y  (2/3 ) = 0(x 1) y + 2/3 = 0 y = 2/3
posted on May 9, 2014 
Algebra
1/3 > 3
posted on May 8, 2014 
math
Ho: u1u2 = 0 Ha: u1u2 is not 0 teststatistic = 3.8563 pvalue = 0.00038 df = 43 Conclusion:Since pvalue 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 
Math
Yes total bands: 185 P(pink) = 95/185 = 19/37 P(brown) = 90/185 =18/37
posted on May 8, 2014 
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 
math
(a^4b^6)^0 = 1
posted on May 8, 2014 
math
=1/(2x)^6 = 1/64x^6
posted on May 8, 2014 
Algebra
W=√1/LC W^2 = 1/LC LCW^2 = 1 L = 1/CW^2
posted on May 8, 2014 
algebra
Logb(a) = c Log1/5(25) = 2
posted on May 8, 2014 
math
Width of pool is x+3 Length of pool is 3x4 Width of deck is 3x2 Length of deck is 2x+6 area= (2x+6)(3x2)  (3x4)(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 
math
Wrong answer
posted on May 7, 2014 
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 
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 
Statistics
n = 30 x = 31.5 μ = 32 SEm = SD/√n SEm = 4/√30 SEm = 0.73 z = ( x  μ ) / SEm z = (31.532)/0.73 z = 0.68 P(z < 0.68) = 0.2483
posted on May 7, 2014 
ALGEBRA
• 13 in, 84 in, 85 in
posted on May 7, 2014 
Math
(2/5)(3/8) = 6/40
posted on May 7, 2014 
Algebra
(z + 3)(z +15)
posted on May 6, 2014 
stat
9C2(.17)^2(.83)^7
posted on May 6, 2014 
algebra
Let x: 5 bill let y: 10 bill x + y = 25 5x + 10y = 230 5x + 10(25x) = 230 5x + 250 10x = 230 5x = 20 x = 4 y =21
posted on May 6, 2014 
statistics 101 college
phat = 8/28 = 0.286
posted on May 6, 2014 
ALGEBRA
1 15 = 36x 72 14 +72 =36x 58 =36x 58/36 = x 29/18 = x
posted on May 5, 2014 
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 
math
850(1+.15/12)^48 = 1543.o516 Monthly payment 1543.0516/48 = $32..15
posted on May 2, 2014 
math
All correct except 5 #5 is d
posted on May 2, 2014 
Math
3x+6y=6 2x3y=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 
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