Kuai
This page lists questions and answers that were posted by visitors named Kuai.
Questions
The following questions were asked by visitors named Kuai.
Answers
The following answers were posted by visitors named Kuai.
First, LCD = x x(x)+ x(8/x) = x(-9) x^2+8 = -9x Now add 9x both x^2+9x+8 = 0 Factor: (x+8)(x+1) = 0 x+ 8 = 0. x+1= 0 x+8-8 = 0-8. x+1-1 = 0-1 x= -8. x= -1 x= -8, -1
13 years ago
I = prt I = 460 * 3 * 0.035 I = $ 48.30
13 years ago
Net loss
13 years ago
Let's new = x, old = y x+y = 45 x= y+17 y+17+y = 45 2y+17 = 45 2y+17-17=45- 17 2y = 28 2y/2 = 28/2 y = 14 x = y+17 x = 14+17 x = 31 So new tire cost $ 31 and used tire cost $ 14
13 years ago
y = (-9e^7x)/(5x+3) y' = -9(35x^2+21x+3)*e^7x / (5x+3)^20
13 years ago
I think the mode is going to change
13 years ago
typo There is typo I do not know where I got power 20 -9( 35x+ 16 ) * e^7x /(5x+3)^2
13 years ago
Bobby = x+14 Tina = x Seda = 2(x+14) x+14+x+2x +28 = 208 4x + 42= 208 4x + 42-42= 208 -42 4x = 166 4x/4 = 166/4 x = 41.50 Tina = $ 41.50 Bobby =$ 55.50 Seda = $ 111
13 years ago
4.2x + 3.8y =1.9 -4.2x+ 4.2x +3.8y = -4.2x + 1.9 3.8y = -4.2x+ 1.9 y = -21x/19 + 1/2 Slope is -21/19 y-intercept (0, 1/2) x-intercept (-21/19, 0)
13 years ago
2 - x = 11(x - 1) 2 - x = 11x - 11 2 - x + x = x + 11x -11 2 = 12x - 11 2 + 11 = 12x -11 + 11 13 = 12x x = 13/12
13 years ago
5(10)(10) * (5.6)(10)(10)(10)(10) = 28000000 2.8 * 10^7
13 years ago
2pies *15% +4pies * 27% + 6 pies *58 2(.15)+4(.27)+ 6(.58) = 4.86 pies Profit = $4(4.86) - $2(6) Profit = $19.44 - $12 = $ 7.44
13 years ago
4/5 > 30%
12 years ago
1. u = ln(t) du = 1/t dt u du u^2/2 + c (ln(2))^2/2 + c 2. 1/t^2 (1- 2t^2)dt Then multiply 1/t^2 (1/t^2 -2)dt -1/t -2t + c
12 years ago
Typo (ln(t))^2/2 + c
12 years ago
X^2(3x-2)^-2/3/(2x-3)^3 - 2x(x+3)(3x+2)^1/3/(2x-3)^4
12 years ago
4a^6 b^8 * a^5 / 8a^6 b^3 = 4a^11 b^8 /8a^6 b^3 = a^5 b^5 /2
12 years ago
6e^5x = 23 e^5x = 23/6 lne^5x =ln(23/6) 5x = ln(23/6) x = ln(23/6)/5
12 years ago
Total = 7+43 = 50 Blue = 7 Blue/total 7/50 * 100 = 14%
12 years ago
yhat = 64.68 + 4.79x
12 years ago
a) 1-1/k^2 1- 1/(2.3)^2 1- 1/5.29 (5.29-1)/5.29 = 4.29/5.29 = 81.1% b) a) 1-1/k^2 1- 1/(3.3)^2 1- 1/10.89 (10.89-1)/10.89 = 9.89/10.89 = 90.8%
12 years ago
y = mx + b 3x + y = 5 3x - 3x + y = -3x + 5 y = -3x + 5 m = -3 y - y1 = m(x -x1) y - 4 = -3(x - (-1)) y -4 =-3(x+1) y - 4 = -3x -3 y -4 + 4 = -3x -3 + 4 y = -3x + 1
12 years ago
f(x) = g(x) g(x) tangent at x = -2.25, .25, 3.75
12 years ago
mean = x*p(x) a) 10(.37) + 11(.09) + 12(.05) + 13(.14) + 14(.35) 3.7 + 0.99 + 0.6 + 1.82 + 4.9 = 12.01 x^2*p(x) variance = 10^2 (.37) + 11^2 (0.99) + 12^2 (0.05) +13 ^2 (0.14) +14^2 (0.35) 37 + 119.79 + 7.2 + 23.66 + 68.6 = 256.25 Standard deviation = sqr...
12 years ago
1.5^x = 70 x ln1.5 = ln70 x = ln(70)/ln(1.5)
12 years ago
9A + 2C = 252 C = A -6 9A + 2( A -6) = 252 9A + 2A - 12 = 252 11A = 264 11A/11 = 254/11 A = 24 C = 18
12 years ago
Typo 11A/11 = 264/11
12 years ago
A = lw 3600 = 5l 3600/5 = 5l/5 l = 720 cm w = 5 cm p = 2 l + 2w p = 2(720) + 2(5) p = 1450 cm
12 years ago
5-x-x = 17 5-2x = 17 -5 + 5 -2x = 17-5 -2x = 12 x = -6
12 years ago
I made mistake because 17 not positive -2x = -17-5 -2x = -22 x =11
12 years ago
7c + 4c = 11c
12 years ago
-7(3 +5x) = 399 -21 - 35x = 399 -21 + 21 -35x = 399+ 21 -35x = 420 -35x/-35 = 420/-35 x = -12 Proof: -7(3 + 5*(-12) = 399 -7( 3-60) = 399 -7(-57) = 399 399 = 399
12 years ago
(4x -2) (3x -4) = 12x^2 - 16x - 6x + 8 = 12x^2 - 22x + 8
12 years ago
V = 1/3 pi r^2 h 350 = 1/3(pi) (3.5)^2 h 1050 = 12.25pi *h 1050 = 12.25(3.14) h 1050 = 38.465h 38.465h/38.465 = 1050/38.465 h = 27.29754
12 years ago
3B = h (q+z) 3B/h = q +z 3B/h -z = q
12 years ago
4x + 24x^3 + 1
12 years ago
12x^2 + 3y^2 = 108
12 years ago
A = lw l = 2x-1 w = x 21 = x(2x -1) 21 = 2x^2 -x 2x^2-x -21 =0 (x +3)(2x -7) x = 7/2 = 3.5 2(7/2)-1 = 6 l = 6; w = 7/2 p = 2l + 2w p = 2(6) + 2(3.5) = 19
12 years ago
(3b+1) (3b +1) = 16 9b^2 + 3b +3b + 1 = 16 9b^2 + 6b + 1 = 16 9b^2 + 6b + 1 -16 = 16-16 9b^2 + 6b -15 = 0 3(3b^2 + 2b -5) = 0 3(b-1)(3b+5) = 0 b - 1 = 0 3b + 5 = 0 b -1+1 = 0 + 1 3b + 5 - 5 = 0-5 b = 1 3b = -5 3b/3 = -5/3 b = -5/3 b = 1, -5/3
12 years ago
5p^3/12p^4 = 5/12p
12 years ago
(X-1)(x-1)-4y^2 x^ 2 -x -x +1 -4y^2 x^2 -2x + 1 -4y^2 (x -2y-1)(x +2y -1)
12 years ago
3x -2y = 6 5x = 5 - 25y x = 1-5y Substituting 3(1-5y) -2 y = 6 3-15y -2y = 6 3- 17y = 6 3-3- 17y = 6- 3 -17y = 3 y = -3/17 x = 1-5(-3/17) x = 32/17 (32/17, -3/17)
12 years ago
-2(8t^2 -10t -6) = 0 -2(2t -3) (4t +1) = 0 2t -3 = 0 2t-3 + 3 = 0 + 3 2t = 3 t = 3/2 second
12 years ago
Mean is correct. Standard deviation = sqrt(npq)) sqrt(30* .85 *.15) = 1.96
12 years ago
P( at least one boy) = 1-p(all girls) 1-(1/2)^ 8 1-1/256 (256-1)/256 = 255/256 = 0.996
12 years ago
You can p(x ) because x values are given p( x ) = 5-x p(x) = 5-1 = 4 p(x) = 5-2 = 3 p(x) = 5-3 = 2 P(x) = 5-4 = 1 What about that 10 belong to
12 years ago
(5-x)/10 (5-1)/10 = 0.4 (5-2)/10 = 0.3 (5-3)/10 = 0.2 (5-4)/10 = 0.1 x 1 2 3 4 P(x) 0.4 0.3 0.2 0.1 It is unclear. What is the 10 doing there
12 years ago
You can check question first P(x) = (5-x)/10 or 5-x/10 it is easy to compute mean when you get p(x).
12 years ago
mean = 1(.4) + 2 (.3) + 3(.2) + 4(.1) Mean = .4 +.6 + .6 +.4 Mean = 2.0 variance = 1^2 (.4) 2^2(.3) + 3^2(.2) + 4^2(.1) variance = .4 + 1.2 + 1.8 + 1.6 variance = 5 Standard deviation = sqrt(variance - mean^2) Sqrt(5-2^2)) = 1
12 years ago
2x^2 +9x = -1 x^2 + 9x/2 +81/16 = -1/2 +81/16 (x +9/4)^2 = 73/16 x + 9/4 = -+sqrt(73/16) x = (-9 - sqrt(73))/4 x = (-9 + sqrt(73))/4
12 years ago
variance = 1^2 (.4) + 2^2(.3) + 3^2(.2) + 4^2(.1
12 years ago
n = 252 phat = 0.77 p = 0.71 q = 1-p = 0.29 standard deviation = sqrt((pq/n)) = sqrt(0.7)(0.29)/252) = 0.02858 z score = (phat -p)sd/sqrt(n) z = (0.77-0.71)/0.02858 z = 2.10 P(phat > 0.77) = p(z < 2.10) 1- 0.9821 = 0.0179
12 years ago
-10(x+h) + 16 -(-10x +16)/h (-10x -10h +16 + 10x -16)/h -10h/h lim(h->0) = -10
12 years ago
Incorrect p(s) =0.87 n = 5 P(x =4) P(x) = nCx p^x(1-p)^n-x (5C4)(0.87)^4(0.13)^1 = 0.372
12 years ago
No problem
12 years ago
(E) Yes it is correct but remembered that your answer should be three decimal places. 0.408 (F) = 0.000244
12 years ago
lim(h->0) f(x+h)-f(x))/h 2(x+h)^2 -3(x +h)- 4 - (2x^2 -3x -4))/h 2(x^2 + xh + xh + h^2 ) - 3x -3h -2x^2 + 3x + 4))/h ( 2x^2 + 4xh + 2h^2 -3x -3h -4-2x^2 +3x +4))/h (4xh +2h^2 -3h))/h h(4x + 2h -3)/h lim(h->0) (4x +2h -3) = 4x +2(0) -3 = 4x -3
12 years ago
C D A yes it is correct
12 years ago
450,000 + 90,000 + 190,000 - 10,000 730, 000 - 10,000 =$ 720,000
12 years ago
6. -2r(8r +5 -2r(8r) +5(-2r) = -16r^2 -10r 7. 4a(a^2 + 7a + 4) 4a(a^2) + 4a (7a) + 4a(4) = 4a^3 + 28a^2 +16a 8. (2y-3)(3y-2) 6y^2 -4y -9y +6 = 6y^2 - 13y + 6
12 years ago
Is that tabel two or one. You can make it clear.
12 years ago
Table two or one
12 years ago
Two table or one table
12 years ago
Some of the numbers are missing there.
12 years ago
Yes it is correct.
12 years ago
A = 1/2r^2 θ A = 1/2(6)^2(pi/2) A = 1/2(36)(pi/2) A = 9pi cm^2
12 years ago
(20(15) +28 -8)/20 (300+28-8)/20 320/20 = 16
12 years ago
2 between the fence would have an addition of 2 ft to each side of the garden 8ft. 32 +(32+8) = 72 ft 72(1.22) =$ 87.84
12 years ago
Almost right (3x+2) (x-7) 3x^2 -21x + 2x -14 3x^2 -19x -14
12 years ago
Yes it is correct. 0.093
12 years ago
r = -0.45
12 years ago
Mean = sum/n 5 = sum/7 5(7) = 7(sum/7) 35 = sum 35 to 42 42-35 = 7
12 years ago
1. (1.2z)(-4+2y) (1.2z)(-4) + (1.2z)(2y) = -4.8z + 2.4yz 2. (-2e - 3f +4)(-e) (-2e)(-e) -3f(-e) +4(-e) = 2e^2 + 3ef -4e 3. (7v)(-7v-7x) 7v(-7v) -7x(7v) = -49v^2 -49xv 4. (-4x)(-7+3y) (-4x)(-7) + 3y (-4x) = 28x - 12xy 5. (b) (-0.1a + 8b -0.7c) (b) (-0.1a)...
12 years ago
you close but z = (x- mu)/sigma z = (56-45)/5.3 = 2.08 z = 11/5.3 = 2.08 z = (x-mu)/sigma z = (245-223)/12.4 z = 22/12.4 = 1.77
12 years ago
P(Ā) = 1- P(A) P(Ā) = 1- 0.8 P(Ā) = 0.2
12 years ago
c + b =120 21c +1
12 years ago
c + b =120 21c +15b = 2244 c = 120-b 21(120-b ) + 15b = 2244 2520 -21b + 15b = 2244 2520 -6b = 2244 2520-2520 -6b = 2244-2520 -6b = -276 b = 46 c = 120 -46 c = 74 Cashew nuts = 74kg Brazil nuts = 46kg
12 years ago
Yes. your anwser is wrong.
12 years ago
za/2 = 1.645
12 years ago
x^2 + 9x +16 = x + 4 x^2 + 9x -x + 16 - 4 = -(x+4) x^2 + 8x + 12 = 0 (x +2)(x+6) = 0 solve for x x + 2-2 = 0 -2 x = -2 x - 6 -6 = 0-6 x = -6 (-2, 2), (-6 ,-2)
12 years ago
Typo x + 6 -6 = 0-6 x = -6
12 years ago
z= (79.7- 81)/(13.3/sqrt(51)) z= -1.3/1.862372512 z = -0 .698 or -0.70
12 years ago
because you multiply 13.3 sqrt (51) but it is division. 13.3/sqrt(51).
12 years ago
z = (29.6-25)/(15/sqrt(36) z = 1.84 z = (30-25)/(15/sqrt(36) z = 2
12 years ago
a is correct answer
12 years ago
t = 2.049 P-value = 0.0325
12 years ago
You are testing one tail.
12 years ago
.1x + .5(200-x) = .2(200) .1x + 100 -.5x = 40 -.4x + 100 = 40 -.4x + 100-100 = 40-100 -.4x = -60 x = 150 10% at 150 and 50% at 50
12 years ago
Y hat = -.57x + 32.20
12 years ago
a. z = (x-mean)/ sd = (1950-1650)/320
12 years ago
Mean = 0(.25)+ 1(.50) + 2(.25) Variance = 0^2(.25) + 1^2 (.50) + 2^2 (.25) Sd = sqrt((variance - mean^2)) sd = sqrt(1.5- 1)= .7071067812
12 years ago
What Do you mean se2
12 years ago
What Do you mean by this se2
12 years ago
z = (x -mean)/(sd/sqrt(n)) z = (90.8-88)/(10/sqrt(25))
12 years ago
3x-2/x-5 = 2^4 3x-2/x-5 = 16 multiply by x-5 x-5(3x-2/x-5) = 16(x-5) 3x -2 = 16x -80 3x -16x -2 16x-16x -80 -13x -2 = -80 -13x -2 + 2 = -80 +2 -13x = -78 x = 6
12 years ago
Log(4x) -log(x -4) = log5 4x/x-4 = 5 4x = 5(x-4) 4x =5x -20 4x -5x 5x -5x -20 -1x = -20 x = 20
12 years ago
P = 315.50 dp = 31.55 mpa = 16.50 n = 20 315.50 -31.55 = 283.95 Mpa * n 16.50 * 20 = 330 Interest = 330-283.95 Interest = 46.05 rate = 46.05/283.95
12 years ago
(4k^2)^5 4^5 k^10 1024k^10
12 years ago
3x + 9(3) = 6(x+ 3) 3x + 27 = 6x + 18 -3x =-9 x = 3
12 years ago
Is that two table or one table
12 years ago