Posts by Henry
Total # Posts: 14,493

math
(12/300) * 100% = 4% tagged, 0.04s = 150, S = 3,750 Squirrels, total. 
Math
4 years ago: Joy was X years old, Paul was x + 20 years old, (x+20)/x = 7/3, 3x + 60 = 7x, X = 15. x + 20 = 15 + 20 = 35 years, Today: Paul's age = 35 + 4 = 39. 
Math
Mean = (60+42+48+46)/4 = 49, (60+42+48+46+x)/5 = 49, (196+x)/5 = 49, 196+x = 245, X = 49. 9 ( 
Physics
a. V^2 = Vo^2 + 2a*d = 0, 40^2 + (20)d = 0, d = 80 m. b. V = Vo + a*t = 0, 40 + (10t = 0, t = 4 s. 
Physics
2. d = 0.5a*t^2, t = 5min. = 300 s. 
PreCalculus Help? Vectors?
B. The direction will change 180o, and the magnitude will decrease. I'm assuming you mean pi/4. 
Algebra, substitution method
Eq1: x + 5y = 10 Eq2: 2x  6y = 8 Multiply both sides ofEq1 by 2 and add the Eqs: 2x + 10y = 20 2x  6y = 8 Sum: 4y = 12, Y = 3. In Eq1, replace Y with 3 and solve for X: x + 5*3 = 10, X = 5. 
Math
(9m + 6) + (5m6) = 9m+6 + (5m) 6 = 4m + 0 = 4m. 
physics asap
1. V^2 = Vo^2 + 2g*h = 0, 4.7^2 + (19.6)h = 0, h = 1.127 m. above the platform. 3.8 + 1.127 = 4.93 m. above gnd., V^2 = Vo^2 + 2g*h = 0 + 19.6*4.93 = 96.57, V = 9.83 m/s. 2. V^2 = Vo^2 + 2g*h = 0 + 19.6*11.6 = , V = ?. 
Math
The vertical distance across the semicircle = Dia./2 = 20/2 = 10 m., The width of the rectangle = 20 m., The length of the rectangle = 4010 = 30 m., A = pi*r^2/2 + L*W = (3.14*10^2/2) + 30*20 = 757 m^2. P = Pi*Dia./2 + 2L + W = (3.14*20/2) + 2*30 + 20 = 111.4 m. 
Physics
(800/900) * 60N = 53.33 N. = Wt. lost, Wt. in wax = Wt. in air  Wt. lost = 60  53.33 = 
Physics
Tf = 0.5 * 4 = 2 s. = Fall time, h = 0.5g*Tf^2. 
Quadratic Functions and Equations
A = 2 * 25 * 100 = 5000 Sq. Yds. = Area of the lawn, A = L * W = 5,000, 100W = 5,000, W = 50 Yds. 
mathematics
Error = 10.60  10.06 = 0.54. 
math
72p  (1/8)72p = 72p  9p = 63p. 
math
A. V = Vo + g*t = 0, 40 + (32)t = 0, t = 1.25 s. B . h = 16*1.25^2 + 40*1.25 + 6 = 31 Ft. 
maths
h1 = 2760*Tan26 = 1346 Ft. = Ht. of hill above gnd., h2 = Ht. of tower above top of hill, h1+h2 = 2760*Tan32, h2 = 2760*Tan32  h1 = 1725  1346 = 379 Ft. 
maths
h = d*Tan68 = (d+70)*Tan43, d*Tan68 = (d+70)*Tan43, d = (d+70)*0.38, d = 0.38d + 26.6, d = 42.9 Ft., A = 68o. h = d*Tan68. 
physics
M*g = 400 * 9.8 = 3920 N. = Wt. of slab, Fp = 3920*sin35 = 2248.4 N. = Force parallel to incline, Fn = 3920*Cos35 = 3211 N. = Normal force, Fk = u*Fn = 0.6 * 3211 = 1927 N. = Force of kinetic friction, FpFk = M*a, 2248.4  1927 = 400*a. 
algebra
2*sqrt(5) + 3*sqrt(49) = 2*sqrt5 + 3*7 = (2*sqrt5) + 21. 
math
2. P = Po + Po*r*t = $230,000, Po + Po*0.075*2 = 230,000, 1.15Po = 230,000, Po = 
math
36/24 * 2/3 = 3/2 * 2/3 = 6/6 = 1 Cup of butter. 
Math
Triangle #1: a = 3, b = 4, c = 5. Similar Triangle: d = 6, e = 8, f = 10. Both triangles have the same shape as required but different size. The ratios of the corresponding sides are equal: a/d = 3/6 = 1/2, b/e = 4/8 = 1/2, c/f = 5/10 = 1/2. 
Math
P = Po(1+r)^n, P = $20M, Po = Initial investment, r = 0.06/4 = 0.015 = Quarterly % rate expressed as a decimal, n = 4 comp./yr. * 4yrs. = 16 Compounding periods. 
Chemistry
a hydrocarbon is burnt completely in excess oxygen. it is found that 1.00g of the hydrocarbon gives 2.93g carbon dioxide and 1.80g water. find the empirical formula of the hydrocarbon (H=1,C=12,O=16) 
physics
A. k = F/d = 30N./9cm = 3.33 N/cm. B. F = 3.33N/cm * 18cm = 60 N, Work = F * d = 60 * 18 Joules. 
Math
28. P = Po(1+r)^n, Po = $1500, r = 0.085/12 = 0.0071 = Monthly % rate. n = 1comp./mo. * 36mo. = 36 Compounding periods. 
Math
23. 52,400 + 52,400*0.2*5 = 24. 36,725 + 36,725*0.11*6 = 25. 82,302  82302*05*4 =. I believe it should be 5% instead of 58%. Check textbook. 26. Same procedure #25, but change 1yr. to 12 mo. 27. P = Po(1+r)^n, Po = $5,000, r = 0.04/4 = 0.01 = quarterly % rate. n = 4 Comp./yr... 
Math
Ao = Ar + Ar*r*t, Ao = 12,345 + 12,345*(0.06/360)*120 = $12,591.90 = Amt. owed or taken out. 
physics
In the circuit at right, two resistors are connected in parallel. What is the voltage across the 4 ? resistor? What is the voltage across the 12 ? resistor? 
physics
A circuit is powered by a 5 V battery and has 0.2 A of current through it. If the circuit contains two resistors connected in series and one of the resistors has a resistance of 5 ?, what is the resistance of the other resistor? 
algebra 2
a. Tan (theta) = 0, Theta = 0. b. Theta = 90o. 
physics
I = E/(R1+R2) = 10/(10+20) = 
physics
R = 200 + 200 = 
math
P = Po + Po*r*t = 28,500 + 28,500*(0.08/360)*118 = 
physics
M*g = 9.8M = Wt. of vehicle = Normal(Fn). Fp = Mg*sin A = 9.8M*sin 0 = 0. = Force parallel with surface. Fk = u*Fn = 0.7 * 9.8M = 6.86M N. = Force of kinetic friction. Fp  Fk = M*a, 0  6.86M = M*a, a = 6.86 m/s^2. V^2 = Vo^2 + 2a*d = 0, Vo^2  13.72*24 = 0, Vo = 18.1 m/s. 
physics
M*g = 100 * 9.8 = 980 N. = Wt. of crate = Normal (Fn), Fk = u*Fn = u * 100 = 100u = Force of kinetic friction, F  Fk = M*a, 300  100u = 100*0 = 0,, u = 3. 
Math
You are welcome. 
Math
4. (sqrt3+sqrt2)^2  3 + 2*sqrt(3*2) + 2 = 5 + 2*sqrt(6). 
Math
1. sqrt(3c^2)/sqrt(27) = c*sqrt(3)/sqrt(9*3) = c* sqrt(3)/3*sqrt(3) = c/3. 2. sqrt(27)*sqrt(3) = sqrt(9*3)*sqrt(3) = 3*sqrt(3) * sqrt(3) = 3 * 3 = 9. 3. sqrt(75)  4*sqrt(75) = 3*sqrt(75) = 3*sqrt(25*3) = 3*5*sqrt(3) = 15 * sqrt(3). The student should do #4. 
Math & science?
F = 1/P = 1/6.8 = 0.147 cycles/s = 0.147 Hz. 
Algebra 1
A = L * W, A = L*(x + 4) = 2x^3  29x + 12, L = (2x^3  29x + 12)/(x+4), Use longhand division, L = 2x^2  8x + 3. 
Math
(1200/2400) * 1h = 0.5h = 30 min. to print 1200 blackand white posters, 50  30 = 20 min. to print 500 colored posters, (60min/20min) * 500 = 1500 colored posters in 1 hour. 
math
A1 = 2(L*h) + 2(W*h) + 2(L*W) = Surface area when ht. = 1in , A2 = 2(L*h) + 2(W*h) + 2(L*W) = Surface area when ht. = 2 in, A2  A1 = The increase in surface area. 
math
Fraction = n. n*0.9/0.5 = 1.8n. 1.8n/n = 1.8 = 180%, Change = 180%  100% = 80%. 
math
By what percent will a fraction change if its numerator is decreased by 10% and its denominator is decreased by 50%? 
Algebra
P = Po(1+r)^n, Po = $2600, r = 0.04/yr. n = 1comp./yr. * 7yrs. = 7 Compounding periods. P = 2600(1.04^7) = 
science
d = V * t = 102 = 8, V * 4 = 8, V = 2 m/s. 
Math
P = Po + Po*r*t = 1000 + 1000*0.16*1 = $1,160, 1160  (350 + 200 + 400) = $210 Due on 1 Jan. 2003. 
Math
P = Po + Po*r*t = 1,000 + 1000*0.145*1 = $1,145, 1145  (200 + 400) = $545 = Bal. due in 1 yr. 
Physics
Incomplete. 
finance
Use same Eq I used in your 12:38 AM post. 
finance
750/mo. * 360mo. = $270,000 = Total cost, P = (Po*r*t)/(1(1+r)t) = 270,000, r = 0.04/12 = 0.000328/mo. a. (Po*0.000328*360)/(11.000328^360) = 270,000, (Po*0.1180)/(0.1114) = 270,000, 1.059Po = 270,000, Po = $254,898.31 = Max. amount that can be borrowed. b. 254,898.31 + 20... 
Math
You are right! 
algebra 2
1. x^2  (y12)^2 = 144, and Y = x^2. x^2  (y^2  24y + 144) = 144, Replace x^2 with y: y  y^2 + 24y 144 = 144, y^2 + 23y  144 = 144, y^2 + 23y  288 = 0, Use Quadratic Formula: Y = (23 + sqrt(529  1152))/(2) , Y = (23 + 24.96i)/(2) = 11.5  12.5i, and 11.5 + ... 
Math
post it. 
Math
After 3 years: P = Po + Po*r*t + 500, P = 1200 + 1200*0.086*3 + 500 = $2009.60, After 6 years: P = 2009.60 + 2009.60*0.086*3 = 
Physic (store energy)
T = 2pi * sqrt L/g, T^2 = 39.5*L/g = 1.44^2, 39.5 * 0.51/g = 2.074, 20.145/g = 2.074, g = 9.71 m/s^2. 
algebra
h = 30 + 75*sin60 = 94.95 Ft. above water. 
math
a. 3/7 + 2/5 = 15/35 + 14/35 = 29/35. b. 35/35  29/35 = 6/35. 
Maths
1. 2x^2  4x + 1 = 0, X = (B + sqrt(B^24AC))/2A, X = (4 + sqrt(16  8))/4 = 1.71, and 0.294. 2. 3x^2 + 4x  7 = 0, B^2  4AC = 16 + 84 = 100, The discriminant is positive; therefore, we have 2 real solutions. 
Maths
X goats. 4x Legs. ns. 45x Chickens. 2(45x) = 90  2x Legs. 4x + (902x) = 150 Legs. X = 30 Goats. 45x = 45  30 = 15 Chickens. . 
Physics
Given: M1 = 5kg, V1 = 0.1 m/s. M2 = 10kg, Vz = 0. V3 = Velocity of M1 after collision. V4 = Velocity of M2 after collision. Momentum before = Momentum after. M1*V1 + M2*V2 = M1*V3 + M2*V4. 5 * 0.1 + 10 * 0 = 5*V3 + 10*V4, Eq1: 5V3 + 10V4 = 0.5. V3 = ((V1(M1M2) + 2M2*V2)/(M1+... 
physics
Unless otherwise stated, the angle is measure CCW from the +xaxis. 150o CCW = 30o N. of W. Mg = 55 * 9.8 = 539 N. = Wt. of load = Normal force(Fn). Fk = u*Fn = 0.3 * 539 = 161.7 N. = Force of kinetic friction. F*Cos30Fk = M*a. 600*Cos30  161.7 = 55*a, a = ? F*Cos30 
Math
a. T = 9km/36km/h = 0.25h = 15 min. b. r = 2km/20min = 0.10 km/min = 6 km/h. c. r = d/T = 11km/(15+20)min. = 
Physics
When all goes out , you don't know which one to replace! 
Finance Math
X = total transactions. 3x/4  7 = 209.. X = ? 
Algebra
Eq1: S + L = 7. Eq2: 0.2S + 0.3L = 1.8. Multiply both sides of Eq1 by 0.2 and add the Eqs: 0.2S  0.2L = 1.4 0.2S + 0.3L = 1.8 Sum: 0.1L = 0.4 L = 4. In Eq1, replace L with 4 and solve for S. 
algebra
Betty is X years old. Don is X+21 years old. Six years from now: Betty: X+6 years old. Don: (X+21) + 6. (X+21)+6 = 2(x+6). X = ? x+21 = ? don ; ( 
math
Do you mean "What was Jessica's speed in still air"? If so: Upstream: (V3)*T1 = 40. Eq1: T1V  3T1 = 40. Downstream: (V+3)*T2 = 40. Eq2: T2V + 3T2 = 40. Add Eq1 and Eq2: T1V  3T1 = 40 T2V + 3T2 = 40 Sum: T1V + T2V = 80. V(T1+T2) = 80. T1 + T2 = 7 Hours. 7V = 80... 
math
d = V*T = 40. V*7 = 40, V = 5.71 mi/h. 
Science
A parallel circuit. 
Science please help ASAP
1c. The reflection of sound waves. 
Math
Meiling has X stickers. Kelly has 5x stickers. x + 5x = 300. 
Physics
A. V^2 = Vo^2 + 2a*d. 0 = 25^2 + 2a*40 a = ?(It will be negative). B. F = M*a(F will be negative). C. Fn = M*g = 2000 * 9.8 = 19,600 N. = Normal force. Fk = u*Fn = 19,600u = Force of kinetic friction. F19,600u = M*a. F = Value calculated in part B. a = Value calculated in ... 
physics
A. V = Vo + a*t. 56.5 = 35 + a*5, a = ? B. F = M*a. 
Finance Math
30year Loan: P = Po*r*t/(1(1+r)^t). Po = $218,000. r = 0.049/12 = 0.004083 = Monthly % rate expressed as a decimal. t = 12mo/yr. * 30yrs. = 360 Months. P = (218,000*0.004083*360)/(11.004083^(360)) = $416,514.14. I = PPo = 416,514.14  218,000 = $198,514.14. 15year Loan... 
math
$Po invested at 4%. $(8000Po) invested at 5% Po*0.04*1 + (8000Po)*0.05*1 = 350. 0.04Po + 400  0.05Po = 350, Po = $5000. 8000Po = 80005000 = $3000. 
Trig
Disp. = Displacement which is the straight line distance from the starting point (A) to the destination. I used vector analysis and trig to solve it. The only remaining method is The Law of Sine and Cosines. 
Trig
Disp. = 180mi[120o] + 80mi[210o]. X = 180*sin120 + 80*sin210 = 115.9 Mi. Y = 180*Cos120 + 80*Cos210 = 159.3 Mi. Disp. = Sqrt(X^2+Y^2). 
Physics
d = V*t/2. V = 330 m/s. 
Physics
V = Vo + a*t = 0.1 0 + a * 0.2 = 0.1, a = 0.5 m/s^2. 
physics  please help me!
Y^2 = Yo^2 + 2g*h = 0. Yo^2 + (19.6)16 = 0, Yo^2 = 313.6 Yo = 17.71 m. = Ver. component of initial velocity. Yo = Vo*sin50 = 17.71m. Vo = 23.12m/s[50o]. 
physics  help!
Vo = 22m/s[35o]. Yo = 22*sin35 = 12.62 m/s = Ver. component of initial velocity. Y = Yo + g*Tr = 0 at max. ht. 12.62 + (9.8)Tr = 0, Tr = 1.29 s. = Rise time. = Fall time(Tf). T = Tr + Tf = 1.29 + 1.29 = 0*Tr = 0, 
maths
(a,4), (5,2), (3,b). 5a = (3a)/2. 102a = 3  a, a = 7. 24 = (b4)/2. 
Circuits 2
Rp = (N1/N2)^2 * RL = (1/4)^2 * 50 = 3.125 Ohms = Primary resistance. Ip = Vs/Rp 
Circuits 2
What is a and b? 
Circuits 2
I1 = Vi/R1 = 10/20 = 0.5A. = RMS current on primary side. I2 = I1/10 = 0.5/10 = 0.05A = RMS current on secondary side. 
physics
Given: M1 = 12,801kg, V1 = 19 m/s. M2 = 2445kg, V2 = 0. V3 = Velocity of M1 and M2 after collision. Momentum before = Momentum after: M1*V1 + M2*V2 = M1*V3 + M2*V3. 12,801*19 + 2445*0 = 12,801V3 + 2445V3, V3 = 15.953 m/s. M1*V1 = 12,801 * 19 = 243,219 = Momentum before ... 
phyiscs
The procedure is the same as your previous post except the unknown will be M2 1nstead of the velocity. 
Physics
F = ((Vs+Va)/(VsVe)) * Fe. F = ((330+41.4)/(33021.7)) * 3680 = 4433.2 Hz. Vs = Velocity of sound. Va = velocity of the aircraft. Ve = velocity of the eagle. Fe = Freq. emitted by the eagle. 
Algebra
a. 2x/3 = (2*1/2)/3 = 1/3. b. x/3 + 1/4 = (1/2)/3 + 1/4 = 1/2*1/3 + 1/4 = 1/6 + 1/4 = 2/12 + 3/12 = 5/12. The student should do c, and d. 
Physics
Va = 330 m/s. Vw = 1490 m/s. 3.52 = Va/F 3.52 = 330/F, F = 93.75 Hz. Wavelength = Vw/F = 1490/93.75 = 15.89 m. 
Circuits 2
R1 = (N1/N2)^2 * R2 = 20. (1/10)^2 * R2 = 20, R2 = 2000 Ohms. V2 = 10 * V1 = 10 * 10 = 100 Volts. I2 = V2/R2 = 100/2000 = 0.05A. 
Math
(4400/(4400+17,600)) * 100% = 20%. 
Physical
Correction: Disp. = 15 km. 
Physical
d = 60 + (6015) = 105 km. Disp. = 6015 = 45 km. 
math
W = 2  (7) = 9. L = 5  (4) = 9. It is a square. Area = 9 * 9 = 81 Square units. 
algebra 2
Invested $X at 2%. Invested $4x at 5%. Invested $(5000  5x) at 3%. I = Po1*r1*t + Po2*r2*t + Po3*r3*t = 202.50. x*0.02*1 + 4x*0.05*1 + (50005x)*0.03*1 = 202.50, X = ? 4x = ? 50005x = ? 
College Algebra
1. P = Po(1+r)^n Po = $40,000. r = 0.07/4 = 0.0175. = Quarterly % rate. n = 4Comp./yr. * 10yrs. = 40 Compounding periods. P = ? 2. P = Po * e^rt. Po = $40,000. r * t = 0.065 * 10 = 0.65. P = ?