Wednesday
May 4, 2016

Posts by Kuai

Total # Posts: 993

Math
x^2 -25 =0 (x -5)(x+5) =0
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)
October 15, 2015

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
June 8, 2014

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
June 3, 2014

math pls help!!!!!
1. C 2. D 3. B 4. A
May 31, 2014

Statistics 1
z = (score -mean)/sd z = (2500 -2500)/500 z = 0 is 50%
May 30, 2014

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?
May 24, 2014

Math
(x + 79 + 84 + 68)/4 = 80 (x + 231)/4 =80 x +231 = 320 x + 231- 231 = 320-231 x = 89 Fourth test 89
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.
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= 27750-18000 30a = 9750 30a/30 = 9750/30 a = 325 c = 450 -a c = 450-325 c = 125
May 21, 2014

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
May 21, 2014

algebra 2
Standard error = sd/√n = 0.75/√35 = 0.12677 This is not algebra
May 21, 2014

Algebra
13a + 9b -2a -4b 13a -2a + 9b - 4b = 11a + 5b
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
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]
May 21, 2014

Maths (Integration)
(1+x/x^3)dx = x -1/x + c
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\$
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
May 21, 2014

37, 38, 39, 41, 43, 47, 52, 54 Yes
May 20, 2014

statistics
80 * .2 16
May 20, 2014

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
May 19, 2014

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
May 19, 2014

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
May 19, 2014

Statictics
Mean = np = 25(.2) = 5 Standard deviation = sqrt((25 * .2*.8)) = 2
May 19, 2014

Statistics
Phat = 44/50 = .88 mean of error Sqrt(.88* .12/50) = ?
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
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
May 18, 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.
May 18, 2014

statistics
(1- .98)/2 = .01 = 2.33
May 18, 2014

alegbra/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
May 17, 2014

alegbra/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 = 32500(1.01725)^12 A = \$39,903.94 d...
May 17, 2014

Alegbra
A = p(1 + r)^t 60000 =p(1.03)^30 60000 = 2.427262471p P = \$24719.21
May 17, 2014

Statistics
Range = max -min Range =102 -77 Range = 25 Standard deviation = 8.56
May 16, 2014

ALGEBRA
mean = 9.3, median = 10, mode = 13
May 15, 2014

Statistics
n = (z/2 )^2 * pq/E^2 n = (1.96)^2 *0.82*0.18/0.04^2 n = ?
May 14, 2014

Alegbra 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
May 13, 2014

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
May 13, 2014

(x - 3)^2 = 22 x - 3 =-+√(22) 3-√(22), 3+√(22)
May 13, 2014

Alegbra
6^x = (1/6)^2 6^x = 6^-2 x = -2 3^x = 8 Log3^x = log8 x log3 = log8 x = log8/log3
May 13, 2014

algebra
P(1+ r/n)^tn 8000(1+.12/2)^2*2 8000(1.06)^4 =?
May 13, 2014

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
May 13, 2014

Math
bracelet = x Necklace = 5x x + 5x = 192 6x = 192 6x/6 = 192/6 x = 32 Necklace = 5x = 5(32) = 160
May 13, 2014

Math Help
A = l*w l = 2w -1 120 = (2w-1)w 120 = 2w^2 -w 2w^2 -w -120 = 0
May 13, 2014

Math
0/2, 4/12, 2/3, 5/6, 9/9
May 12, 2014

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
May 12, 2014

Algebra
A = LW L = w-1 120 =(w-1)w 120 = w^2-w w^2-w-120 =0
May 12, 2014

Pre-algebra
P=2l+2w 70 = 2(17) + 2w 70 = 34 +2w 70-34 = 34-34 +2w 36 = 2w w = 18
May 12, 2014

Math
A) \$1629.53 x 0.195 x 21/365 = \$18.28 B) \$2639. 99 * .2295 * 30/365 = \$49.80
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 probability ...
May 11, 2014

Economics (42)
You're welcome.
May 11, 2014

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)
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
May 11, 2014

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
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
May 11, 2014

MAth
4. (1-5)/(3-6) = 4/3 5. (-6-(-5)/(-3-(-3) -1/0 Undefined
May 10, 2014

algebra
x = 7-(1/8)y x-7 = -1/8y -8x+56 =y
May 10, 2014

Stats
n = [(z-value * sd)/E]^2 n =[ (2.575 * 42)/3]^2
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 .30. a. How large a ...
May 9, 2014

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)
May 9, 2014

Economics (41)
I did not know how to do it.
May 9, 2014

Economics (41)
Only c is correct
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 probability that the ...
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 infinite (to 2 decimals...
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 sleeps more than 8...
May 9, 2014

Math
.8/1.6 = .5 .4/.8 = .5 .2/.4 = .5 Constant Geometric
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 Large pipe :12 hours ...
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
May 9, 2014

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
May 9, 2014

Algebra
-1/3 > -3
May 8, 2014

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.
May 8, 2014

Math
Yes total bands: 185 P(pink) = 95/185 = 19/37 P(brown) = 90/185 =18/37
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
May 8, 2014

math
=1/(-2x)^6 = 1/64x^6
May 8, 2014

math
(a^4b^6)^0 = 1
May 8, 2014

Algebra
W=√1/LC W^2 = 1/LC LCW^2 = 1 L = 1/CW^2
May 8, 2014

algebra
Logb(a) = c Log1/5(25) = 2
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
May 7, 2014

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
May 7, 2014

math
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
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 = (31.5-32)/0.73 z = -0.68 P(z < -0.68) = 0.2483
May 7, 2014

ALGEBRA
• 13 in, 84 in, 85 in
May 7, 2014

Math
(2/5)(3/8) = 6/40
May 7, 2014

Algebra
(z + 3)(z +15)
May 6, 2014

stat
9C2(.17)^2(.83)^7
May 6, 2014

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
May 6, 2014

statistics 101 college
phat = 8/28 = 0.286
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%
May 5, 2014

ALGEBRA
1 -15 = 36x -72 -14 +72 =36x 58 =36x 58/36 = x 29/18 = x
May 5, 2014

math
850(1+.15/12)^48 = 1543.o516 Monthly payment 1543.0516/48 = \$32..15
May 2, 2014

math
All correct except 5 #5 is d
May 2, 2014

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
May 1, 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
May 1, 2014

economics (4)
(1/.2)* 40 = \$200 billion
May 1, 2014

math (5)
a) dp/dx = -.032x + y + 28 = -.032(4000) + 150(1) + 28 = -128 + 150 + 28 = 50 dp/dy = -34y + x + 22 = -34(150) + 4000(1) + 22 = -5100 + 4000+ 22 = -1078 b) dp/dx = -.032x + y + 28 = -.032(5000) + 150(1) + 28 = -160 + 150 + 28 = 18 dp/dy = -34y + x + 22 = -34(150) + 5000(1) + ...
May 1, 2014

Math (6)
dS/dW = (.425)(.007184)W^.425-1 (H^.725) dS/dW =0.0030532W^-.575(H^.725) dS/dW = 0.0030532H^.725/W^.575 0.0030532(180)^.725/100^.575 dS/dH = (.725)(.007184)W^.425H^.725-1 dS/dH = .0052084 W^.425H^-.275 dS/dH = .0052084 W^.425/H^.275 dS/dH = 0.0052084(100)^.425/180^.275
May 1, 2014

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