Friday
December 19, 2014

Posts by Henry


Total # Posts: 9,752

Algebra
Correction: The Eqs are identical(divide the 1st Eq by 4). So we have an infinite # of solutions.
December 17, 2014

Algebra
m1 = -A/B = -16/-8 = 2 m2 = -4/-2 = 2 m1 = m2. So the lines do not intersect. Therefore, there is no solution.
December 17, 2014

physic
V^2 = Vo^2 + 2g*d = 0 + 19.6*50 = 980 V = 31.3 m/s.
December 17, 2014

Algebra 1
2x/3 + y = 7 Multiply both sides by 3: 2x + 3y = 21
December 16, 2014

physics
X = -5.4 m/s. Y = 3.6 m/s. Tan Ar = Y/X = 3.6/-5.4 = -0.66666 Ar = -33.7o = Reference angle. A = -33.7 + 180 = 146.3o = Direction. V = X/Cos A = (-5.4)/Cos146.3 = 6.49 m/s[146.3o].
December 16, 2014

Algebra
1. (-7)(3)-(5)(-3) = -21 - (-15) = -21+15 = -6 2. (x^2+6) - (3x^2-2x-5)=x^2+6-3x^2-2x-5 = =2x^2 - 2x + 1
December 16, 2014

Algebra
Answer = A.
December 16, 2014

Algebra 2
K = y/x = 1/-3 = -1/3. y/x = -1/3 4/x = -1/3 -x = 12 X = -12.
December 16, 2014

Algebra 2
a. Y = 2x - 3 Y = mx - b m = 2 = Slope. b. 3y - 7x = 1? -7x + 3y = 1 m = -A/B = 7/3
December 16, 2014

math
X = Tony's future age. 4x = Mr. Jacob's future age. 4x - x = 55-7 3x = 48 X = 16 4x = 4 * 16 = 64 16-7 = 9 years. 64-55 = 9 years. So Mr. Jacobs will be 4 times as old as Tony in 9 years.
December 16, 2014

Math
D. All real numbers.
December 16, 2014

geography
2+2\4[o]
December 16, 2014

Algebra 1
Y = mx + b Y = 6x - 4
December 15, 2014

Physics
V = Vo + g*t = 16 - 9.8*1.5 = 1.3 m/s. Your answers are correct.
December 15, 2014

physics
a. X = 181*Cos66.2 b. Y = 181*sin66.2
December 14, 2014

physics
V = Vo + a*t = 0 + 231*0.0442 = 10.21 m/s. a. V*Cos A = 10.21*Cos55 = 5.86 m/s. b. 10.21*sin55 = 8.36 m/s.
December 14, 2014

math
X = Footballs sold @ $22 ea. Y = Footballs sold @ $6 ea. Eq1: x + y = 6000 Eq2: 22x + 6y = $76,000 Multiply Eq1 by -6 and add the Eqs: -6x - 6y = -36000 22x + 6y = 76,000 Sum: 16x = 40,000 X = 2500 In Eq1, replace X with 2500: 2500 + y = 6000 Y = 6000-2500 = 3500
December 14, 2014

7th grade math
3. Correct. 9. Correct. 12. X = 305/18 = 16 17/18 13. Correct. 14. C < -12.8 21. Correct. 26. Correct.
December 14, 2014

physics
Fp = Mg*sin50 Fn = Mg*Cos50 Fk = u*Fn = u*Mg*Cos50 Mg*sin50-0.1Mg*cos50 = M*a Divide both sides by M: g*sin50-0.1g*Cos50 = a a = 9.8*sin50-0.98*Cos50 = 6.88 m/s^2.
December 14, 2014

physics
Answer: The object with the greatest momentum. Object A: M*V = 1.9 * 8 = 15.2 kg-m/s Object B: M*V = 2.0 * 5 = 10.0 kg-m/s
December 13, 2014

Physics
Conservation of momentum: (M1+M2)V1/8 = M1*V1-M2*0 Multiply both sides by 8/V1: M1 + M2 = 8M1 3.32 + M2 = 8*3.32 M2 = 8*3.32 - 3.32 = 23.24 kg.
December 12, 2014

Physics
Conservation of momentum: (M1+M2)V = M1*V1-M2*V2 M1 = 4.66 kg M2 = 3.00 kg V1 = 4.77 m/s. V2 = 3.33 m/s. Solve for V.
December 12, 2014

physics
KE2 = KE1 * (V2/V1)^2 KE1 = 5*10^5 J. V1 = 36 mi/h V2 = 115 mi/h Solve for KE2.
December 12, 2014

Science
Vo = 27.4m/s[48o] Xo = 27.4*Cos48 = 18.3 m/s. Yo = 27.4*sin48 = 20.4 m/s. h = 0.5g*t^2 = 860 m. 4.9*t^2 = 860 t^2 = 175.5 Tf = 13.2 s. = Fall time. Dx = Xo*Tf = 18.3m/s * 13.2s = 242.4 m. b. Y = Yo + g*t = 0 + 9.8*13.2 = 129.4 m/s. Tan A = Y/Xo = 129.4/18.3 = 7.07104 A = 82o.
December 12, 2014

Math
P = Po*e^(r*t) e^(r*t) = P/Po r*t = 0.03*10 = 0.30 e^0.3 = P/5 Solve for P. Answer in millions.
December 12, 2014

physics
V = Vo + a*t V = 6.4 m/s. Vo = 0 t = 0.27 s. Solve for a. F = m*a
December 12, 2014

Chemistry
But these are the numbers which have been provided in the question... If u could show me just the way to tackle it, it wud be very helpful,plz.
December 12, 2014

Chemistry
0.250 moles of HCL and 0.100 moles of acetic acid are mixed in 0.365 moles of water. Determine the following: [CH3COOH], [CH3COO^-], pH and pOH. Ka=1.8E-5. Calculate the pH of 0.05M CH3COO-Na+ . Plz show me step by step, really confused right now.
December 12, 2014

physics
V = Vo + a*t V = 20 m/s. Vo = 25.1 m/s. t = 5.7 s. Solve for a. (It should be negative.) F = M*a
December 9, 2014

physics
V^2 = Vo^2 + 2a*d Vo = 0 a = F/m = 196.3/0.39 = d = 1.28 m. Solve for V.
December 9, 2014

physics
Incomplete.
December 9, 2014

math
P = Po + Po*r*t P = 39,995 + 39,995*(0.0249/12)*60 =
December 8, 2014

Physics
a = (F1-F2)/m F1 = 1141 N. F2 = 947 N. M = 2300 kg Solve for a. V^2 = Vo^2 + 2a*d V = 3 m/s. Vo = 0 a: Calculated in step #1. Solve for d in meters. .
December 8, 2014

AP physics
KE = M*V^2/2 KE = 5400 J. M = 2840 kg Solve for V. Units: m/s.
December 8, 2014

physics
a. 30o/h *2h = 60o. b. 360o/h * 2h = 720o. c. 4320o/h * 2h = 8640o
December 8, 2014

Physics
a. d = 0.5a*t^2 = 1.92 m. 0.5a*1.9^2 = 1.92 m 1.81a = 1.92 a = 1.06 m/s^2 b. M*g = 2.84 * 9.8 = 27.8 N. = Wt. of block. Fp = 27.8*sin30 = 13.9 N. = Force parallel to the incline. Fn = 27.8*Cos30 = 24.1 N. = Normal force Fp-Fk = m*a 13.9-Fk = 2.84*1.06 = 3.01 -Fk = 3.01-13.9...
December 8, 2014

Physics
d = 0.5a*t^2 d = 0.79 m. t = 0.64 s. Solve for a. F = m*a
December 8, 2014

physics
See previous post: Sat, 12-6-14, 4:06 PM
December 8, 2014

physics
V^2 = Vo^2 + 2a*d V = 0 Vo = 30 m/s. d = 75 m. Solve for a.(It should be negative). F = m*a. The force will be negative, because it acts against the motion.
December 8, 2014

physics
X m.=Distance the heavier person moves 2x m.= Lighter person distance. x + 2x = 12 3x = 12 X = 4 m.
December 8, 2014

Physics
M*g = 63 * 9.8 = 617.4 N. = Wt. of block Fp = Fs @ critical angle. Mg*sinA = us*Mg*CosA Divide both sides by Mg: sin A = us*Cos A Divide both sides by Cos A: sin A/Cos A = us = 0.47 = Tan A A = 25.2o = The critical angle. Fp = 262.6
December 7, 2014

physics
M*g = 16 N. Solve for g.
December 7, 2014

Physics
PE = M*g*h
December 7, 2014

Math
22n^2 + n - 5 Use AC Method: A*C = 22*(-5) = -110 = -10*11. Select the pair of factors whose sum = B =1: -10, and 11. Form 2 factorable binomials: 22n^2 + (-10n+11n) - 5 (22n^2+11n) - (10n+5) 11n(2n+1) - 5(2n+1) (2n+1)(11n-5)
December 7, 2014

math
See previous post: Sat, 12-6-14, 2:02 PM
December 7, 2014

Physics
V = Vo + a*t V = 0 Vo = 24 m/s t = 0.16 s. Solve for a.(It will be negative) F = M*a
December 7, 2014

ALG 1
12a^4b^3 + 8a^3b^2 = 4a^3b^2(3ab+2). GCF = 4a^3b^2.
December 7, 2014

physics
Incomplete.
December 7, 2014

Physics
X = M1*V1 = 24*3.3 = 79.2 Y = M2*V2 = 33*2.4 = 79.2 1a. Tan A = Y/X = 79.2/79.2 = 1.00 A = 45o = Direction. 1b. Momentum = X/Cos A = 79.2/Cos45 = 112 (M1+M2)*V = 112[45o] (33+24)V = 112[45] V = 1.96 m/s.[45o]
December 7, 2014

problem solving
See previous post: Sun,12-7-14, 1:41 AM.
December 7, 2014

problem solving
Difference = 35 - 0.75*40 = 35 - 30 = 5.
December 7, 2014

problem solving
Cost = Po + 0.05Po = $315 1.05Po = 315 Po = $300 = Initial price. (315-300)/6blks = $2.50/blk 300/(2.50/blk) = 120 Blocks bought.
December 7, 2014

problem solving
400rev/min * 60min/h = 24,000 rev/h. Circumference(C) = 47,520m/24,000rev = 1.98 m/rev C = pi*2r = 1.98 m 6.28r = 1.98 r = 0.315 m = 31.5 cm = Radius of the wheels.
December 7, 2014

problem solving
see 1:52 AM post.
December 7, 2014

Physics
a. d = Xo*Tf = 150 m. 450 * Tf = 150 Tf = 0.333 s. d = 0.5g*Tf^2 = 4.9*0.333^2 = 0.544 m. Below the center.
December 6, 2014

Physics
F = 27in/39in * 29Lbs = 20.1 Lbs.
December 6, 2014

Physics
F1 = 400N[32o] F2 = 536N.[10o] a. X = 400*Cos32 + 536*Cos10 = Y = 400*sin32 + 536*sin10 = Tan A = Y/X A = Fr = X/Cos A = Resultant force @ Ao. b. a = Fr/m = Acceleration @ A Degrees.
December 6, 2014

math
Eq1: Vp + Vw = 570/3 = 190 Eq2: Vp - Vw = 570/5 = 114 Sum: 2Vp = 304 Vp = 152 mi/h In Eq1, replace Vp with 152: 152 + Vw = 190 Vw = 38 mi/h.
December 6, 2014

Algebra 1
(-10,3), m = -1/5. Y = mx + b Y = 3 m = -1/5 x = -10 Solve for b(y-intercept).
December 6, 2014

physics
Momentum = M*V
December 6, 2014

science
V^2 = Vo^2 + 2g*h V = 0 Vo = 10 m/s. g = -9.8 m/s^2 Solve for h.
December 6, 2014

Science
h = 4.6 m. V1 = 16 m/s. V2 = 26 m/s. g = 9.81 m/s^2 h = 0.5g*t^2 Solve for t = Fall time. d = (V2-V1)*t = Distance apart.
December 6, 2014

physics
Wc = M*g = 92kg * 9.8N/kg = 902 N. = wt. of the clock. Fap-Fs = M*a 656 - Fs = M*0 = 0 Fs = 656 N. = Force of static friction. us = Fap/Wc = 656/902 = 0.727 uk = 560/902 = 0.621
December 5, 2014

physics
V^2 = Vo^2 + 2a*d V = 0 Vo = 8.6 m/s. a = u*g = 0.050*(-9.8) = -0.49 m/s^2 Solve for d.
December 5, 2014

Math
(24x^18/6x^3xX^8)/30x^6 = 4x^6/30x^6 = 2/15.
December 5, 2014

Physics
V = Vo + a*t V = 0 Vo = 8.5 m/s t = 3 s. Solve for a.(It will be negative) F = m*a
December 5, 2014

Physics
M1*V1 = (M1+M2)*V M1 = 1600 kg V1 = 13.7 m/s. M2 = 4600 kg Solve for V.
December 5, 2014

physics
Dp = Ds Vp*T = Vs*(T+95.7) 8*T = 4.5*(T+95.7) 8T = 4.5T+430.65 8T-4.5T = 430.65 3.5T = 430.65 T = 123 s. D = Vp*T = 8 * 123 = 984 km.
December 5, 2014

physics
L = V/F V = L*F = 5.8 * 1.15 = 6.67 m/s. Note: The distance between crests is the wavelength(L).
December 5, 2014

physics
T = d/V = 1340/457 = 2.93 s.
December 5, 2014

Quantitative Business Analysis
See previous post.
December 5, 2014

Quantitative Business Analysis
I = Po*r*t I = $9800 r = 0.08 t = 1 yr. Solve Po, the amount borrowed.
December 5, 2014

physics
Eq1: F1 + F2 = 376 N. Eq2: F1 - F2 = 162 N. Sum: 2F1 = 538 F1 = 269 N. In Eq1, replace F1 with 269: 269 + F2 = 376 F2 = 376 - 269 = 107 N.
December 4, 2014

physics help PLZ!!
Fx = -23.3 N. Fy = 409.5 N. 2nd Quadrant. Tan Ar = Fy/Fx = 409.5/-23.3 = -17.57511 Ar = -86.7o = Reference angle(Q4). A = -86.7 + 180 = 93.3o, CCW(Q2) = Direction.
December 4, 2014

Physics
d = V*T d = 2 * 3.84*10^8 m. V = 3*10^8 m/s. = Speed of light. Solve for T.
December 4, 2014

physics
X = -116.8 + 93.5 = -23.3 N. Y = -248.6 + 658.1 = 409.5 N. Tan Ar = Y/X = 409.5/-23.3 = -17.57511 Ar = -86.7o = Reference angle. A = -86.7 + 180 = 93.3o, CCW. Fr = Y/sin A = 409.5/sin93.3 = 410 N. [93.3o]. = Resultant force. Fx = 410*Cos93.3 = -23.61 N = 23.61 N., Left(West).
December 4, 2014

Math
110 = 30*3 + 20 Y = mx + b Y = 30x + 20 (Intercept Form) m = 30 = Slope. b = 20 = Y-intercept. Y = 30x + 20 30x - y = -20 (Standard Form). m = -A/B = -30/-1 = 30 = Slope. Y-Intercept = C/B = -20/-1 = 20. I hope this is what you want.
December 4, 2014

math
Eq1: 8x - 4xy = 3 Eq2: -2x - 5y = 10 In Eq2, solve for X: -2x - 5y = 10 -2x = 5y + 10 X = -5y/2 - 5 In Eq1, replace X with -5y/2 - 5: 8(-5y/2 - 5) - 4y(-5y/2 - 5) = 3 -20y - 40 + 10y^2 + 20y = 3 10y^2 - 40 = 3 Divide both sides by 10: y^2 - 4 = 0.30 y^2 = 0.30 + 4 = 4.30 Y = -...
December 4, 2014

Math Help!
1. (60/75)*100% = 80 %. 80% - 100% = -20% = 20% Decrease. 2. (160/100)*100% = 160% 160% - 100% = 60% Increase. 3. %Cost = 100% - 10% = 90% Cost = 0.90 * 57.63 = $51.87 4. Same procedure as #3.
December 4, 2014

math
Scale: 1/2 in = 1Ft. = 12 in Ratio = (1/2)in/12in = 1/24 L = 24 * 1Ft = 24 Ft. W = 24 * (7.5/12)Ft = 15 Ft. Note: I assumed you mean 7 1/2 in wide.
December 4, 2014

physics
See previous post: Thu 12-4-14, 9:49 AM.
December 4, 2014

physics
M * g = 2970 N. M = 90 kg Solve for g.
December 4, 2014

Economics calculation help
Thanks!
December 4, 2014

Can Ms.Sue Help?
Please
December 4, 2014

Economics calculation help
Kelly total income last year was $24,000, but she could deduct $12,000 for various reasons. How can I calculate; If she had to pay 15% of her taxable income in federal income tax, what was her total tax payment? So I did 12,000 x .15 and got 1800, but I don't know if thats...
December 4, 2014

Math
Your original Eq is the Vertex form of a Y-Parabola that opens downward. I am assuming you want to solve for X. Standard form: Y = -20/27(x^2 + 3x + 2.25) Y = (-20/27)x^2 -(60/27)x - 5/3 Y = (-20/27)x^2 - (20/9)x - 5/3 Use Quadratic Formula. X = -1.5, and -1.5(Double solution...
December 4, 2014

Economics help
Thanks
December 4, 2014

Economics help
An elderly man receives free prescription drugs from a veterans' hospital. So what kind of a good is this, like is this a privately owned service or publicly own service?
December 4, 2014

physics
ho = 186 m. Vo = 64.8m/s[59o] Xo = 64.8*Cos59 = 33.37 m/s Yo = 64.8*sin59 = 55.54 m/s Tr = -Yo/g = -55.54/-9.8 = 5.67 s. = Rise time. h = ho + (-Yo^2)/2g h = 186 + -(55.54^2)/-19.6 = 343.4 m. Above gnd. h = 0.5g*t^2 = 343.4 m. 4.9t^2 = 343.4 t^2 = 70.1 Tf = 8.37 s. = Fall time...
December 4, 2014

Geomatry
Y = (x^2+x-2)/(x^2-x-6) Y = (x+2)(x-1)/(x+2)(x-3) = (x-1)/(x-3) a. Domain = All real values of X except 3. Note: 3 gives a denominator of zero which makes the fraction undefined. f. When Y = 0,(x-1) = 0 x-1 = 0, X = 1. X-Intercept = 1.
December 4, 2014

physics
See previous post: Wed, 12-3-14, 8:20 AM
December 4, 2014

physics
a. KE = M*V^2/2 M = 0.59 kg V = 1.5 m/s Solve for KE. b. KE = M*V^2/2 KE = 7.0 J M = 0.59 kg Solve for V.
December 3, 2014

physics
d = V*t 2*76.5 = 1500t Solve for t.
December 3, 2014

Science
V = 5m/2s = 2.5 m/s. KE = M*V^2/2 = 1539*2.5^2/2 = 4809 J.
December 3, 2014

Algebra 1
Y/X = 24/8 = 3 = K(Y/X is constant). Y/10 = 3 Y = 30.
December 3, 2014

Physics
a. h = 0.5g*T^2 h = 18 m. g = 9.8 m/s^2 T = Fall time in s. Solve for T. d = Xo*T d = 18 m. Xo = hor. speed in m/s. T = Time calculated in part a. Solve for Xo. b. Y^2 = Yo + 2g*h Y = Ver. component of Speed just before it hits the gnd. Yo = 0 = Ver. component of initial speed...
December 3, 2014

physics
a. Vo = 0 V = 12 m/s. t = 6 s. V = Vo + a*t Solve for a. b. V = a*t a = (Use value calculated in part a). t = 10 s. Solve for V.
December 3, 2014

physics
Vo = 30 m/s. V = 0 t = 3 s. V = Vo + a*t Solve for a.
December 3, 2014

Math
See previous post: Wed, 12-3-14, 12:26 AM.
December 3, 2014

Math
d1 = 5mi/h[350o] * 2h = 10mi[350o] d2 = 12mi/h[40o] * 2h = 24mi[40o] d3 = 10mi/h[180] * 5h = 50mi[180] X = 10*Cos350 + 24*Cos40 + 50*Cos180 = -21.8 Miles. Y = 10*sin350 + 24*sin40 + 50*sin180 = 13.7 Miles. d = d1+d2+d3 = X + Yi=-21.8 + 13.7i,Q2. Tan Ar = Y/X = 13.7/-21.8 = -0....
December 3, 2014

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