Thursday

April 17, 2014

April 17, 2014

Number of results: 213,836

**math**

29
*Monday, August 25, 2008 at 8:36pm by Fredr*

**math**

zero
*Thursday, October 16, 2008 at 8:23pm by Fredr*

**math**

for example, for x = 2, y = 0 x = 3, y = -1/3 x = 4, y = -2/3 x = 5, y = -1
*Tuesday, March 9, 2010 at 12:07pm by FredR*

**math**

= (y/3)(y^2+5y+6) = (y/3)(y+2)(y+3)
*Wednesday, March 10, 2010 at 10:44am by FredR*

**Math - FredR**

You're right.
*Monday, April 7, 2008 at 1:09pm by POD*

**math**

That is what I got also.
*Thursday, October 16, 2008 at 9:49pm by Fredr*

**Math**

Oops. Thanks for the correction.
*Thursday, March 11, 2010 at 1:47am by FredR*

**math**

Log10x = -7 is the same as 10^-7 = x or x = 0.0000001
*Sunday, April 6, 2008 at 4:18pm by FredR*

**math**

It would take 10 minutes.
*Tuesday, March 9, 2010 at 1:39am by FredR*

**math**

books = (2ft x 12in/1ft)/(0.75in/book)
*Friday, October 17, 2008 at 12:03am by Fredr*

**Math**

Length/Width = = 10.75/18.5 = 1075/1850
*Sunday, April 6, 2008 at 4:08pm by FredR*

**Math**

More information is needed besides the mean to answer the question.
*Wednesday, April 9, 2008 at 12:26am by FredR*

**Math Algebra 2**

I got a maximum profit of $4200 with 40 pants and 80 shirts.
*Sunday, April 6, 2008 at 5:33pm by FredR*

**Adv. Math**

Assuming compound interest with a period of 1 year, the annual rate would be 4.3%
*Monday, April 7, 2008 at 11:02pm by FredR*

**Math**

There is no answer. x would have to be less than zero which is beyond the bounds where the equation is valid.
*Thursday, October 16, 2008 at 11:13pm by Fredr*

**accounting**

with a loan
*Monday, August 25, 2008 at 12:42pm by Fredr*

**math**

z-score = (raw score - mean)/standard deviation
*Tuesday, April 8, 2008 at 6:05pm by FredR*

**Math 157**

# of ways of selecting winning quintuple = permutations of 5 objects = 5! = 5 x 4 x 3 x 2 x 1 probability of winning = n!/(r!(n-r)!) = 44!/(5!39!)
*Wednesday, March 10, 2010 at 2:03pm by FredR*

**Legal**

I believe an easement is correct.
*Monday, April 7, 2008 at 10:48pm by FredR*

**SOCIAL STUDIES**

Frederick the Great
*Tuesday, April 8, 2008 at 12:42am by FredR*

**accounting**

Decrease in liabilities of $71,000
*Monday, April 7, 2008 at 10:56pm by FredR*

**electronics**

connect your ipod to an FM transmitter
*Monday, August 25, 2008 at 10:43pm by Fredr*

**calculus**

180+arctan(12/-5) = 112.6
*Wednesday, March 10, 2010 at 8:37pm by FredR*

**Math**

2x^2-5x = x(2x-5) = 0 x = 0, 5/2
*Thursday, October 16, 2008 at 11:52pm by Fredr*

**Geometry**

The preimage is the original position before translation, or P(-1,5)
*Saturday, April 5, 2008 at 1:09pm by FredR*

**math**

x = original # of pieces w = gave to wife = 10x/100 m = gave to meg = 3 (x-w-m)/4 = j = gave to joe 18 = x - w - m - j combine and solve for x
*Thursday, March 11, 2010 at 4:46pm by FredR*

**calculus**

The formulas given look like they are for sinusoids and not circles.
*Wednesday, March 10, 2010 at 11:53am by FredR*

**algebra**

Permutations of 9 objects taken 5 at a time = 9!/(9-5)! where 4! = 4x3x2x1 and 9! = 9x8x7x6x5x4x3x2x1
*Wednesday, March 10, 2010 at 6:31pm by FredR*

**geometry**

It doesn't seem like there is enough information to determine the answer
*Thursday, March 11, 2010 at 1:07pm by FredR*

**Physical Science**

The period is the inverse of the frequency, so it would be reduced to half.
*Saturday, April 5, 2008 at 4:07pm by FredR*

**trig**

to convert degrees to rad, multiply by pi and divide by 180.
*Tuesday, April 8, 2008 at 10:08pm by FredR*

**alg2**

function of x equals x minus the absolute value of x, where x is greater than zero.
*Thursday, September 11, 2008 at 11:44pm by Fredr*

**statistics**

12.60 - 23.00 = A A / -1.30 = standard deviation
*Wednesday, March 10, 2010 at 9:18pm by FredR*

**math**

x = original # of tickets y = original price you have 2 equations: xy = 180 (x-2)(y+9)=180+36 substitute equation 1 into 2 and solve.
*Wednesday, March 10, 2010 at 1:50pm by FredR*

**Physics**

two more equations are: m1+m2=M v2-v1=20m/s
*Thursday, April 10, 2008 at 10:28pm by FredR*

**ENGLISH**

If there are more than three authors you can use: Doe, Mary Jane, et al.
*Thursday, October 16, 2008 at 10:13pm by Fredr*

**math**

16-15.2 = 0.8 0.8/0.03 = n = 26 standard deviations so, erf(n/sqrt(2)) = approximately 1 so, 50% of the data would be between 15.2 and 16.
*Wednesday, March 10, 2010 at 1:18pm by FredR*

**math**

a circle has 360 degrees or 2 pi radians, so: radians = 2.7*pi/180
*Sunday, April 6, 2008 at 4:19pm by FredR*

**calculus**

It could be interpreted as the azimuth, which in surveying applications is typically measured in a clockwise direction from north.
*Wednesday, March 10, 2010 at 8:37pm by FredR*

**math**

if you bisect one of the angles, you have a right triangle with a hypotenuse of 1 cm and a short leg of 0.5 cm. Using the Pythagorean theorem, the height would be: height = square root (1^2 - 0.5^2)
*Thursday, March 11, 2010 at 2:03am by FredR*

**Math - FredR**

I asked about radians yesterday,you told me that a circle has 360 degrees or 2 pi radians, so: radians = 2.7*pi/180 Would the answer be 0.047
*Monday, April 7, 2008 at 1:09pm by sue*

**Algebra 2**

It looks right to me. The easiest way to check is to plug the number back into the formula: e^.6931 = 2 2*2-3 = 4-3 = 1
*Wednesday, March 10, 2010 at 8:22pm by FredR*

**calculus**

the function is not continuous when the denominator is zero, or... 0 = x^2+1 solving for x then x = i It is a removable discontinuity since it can be repaired by replacing a single point.
*Thursday, September 11, 2008 at 7:47pm by Fredr*

**Physics**

Taking up where FredR left off, V^2/r = G m/r^2 V^2 = G m/r where m is the mass of Saturn. G = 6.674*10^-11 N*m^2/kg^2 Solve for V
*Wednesday, March 10, 2010 at 11:08pm by drwls*

**math**

A = amt invested at 8.5% B = amt invested at 10% A + B = 50000 or A = 50000 - B income = 0.085A + 0.10B = 4700 substitute A in terms of B and solve
*Tuesday, March 9, 2010 at 11:24am by FredR*

**Math**

I agree with to FredR, up until 0 = 14b - (16v/7)/b^2 The next step should be b^3 = 16v/(14*7)= (8/49)v b = 2*(v/49)^1/3 = 0.5466 v^1/3 Then a = 7b = 3.8264 v^1/3 and c = v/(7b^2) = 0.4781 v^1/3
*Thursday, March 11, 2010 at 1:47am by drwls*

**math**

sa = 4 x pi x r^2 so r = sqrt( sa/(4 x pi))
*Thursday, October 16, 2008 at 11:56pm by Fredr*

**Algebra 2**

(x-h)^2/a^2+(y-k)^2/b^2=1 is the equation for an ellipse, where (h,k) is the center, a is the semimajor axis, and b is the semiminor axis.
*Sunday, April 6, 2008 at 6:12pm by FredR*

**College Calculus (Binomial Series)**

Taylor series is as follows: f(x)=f(a)+f'(a)(x-a)/1!+f''(a)(x-a)^2/2!+f'''(a)(x-a)^3/3!+...
*Tuesday, April 8, 2008 at 9:13pm by FredR*

**trig**

if c is one of the legs of the triangle then it equals four. If it is the hypotenuse then it equals: c=sqrt(5^2+3^2)
*Tuesday, April 8, 2008 at 9:59pm by FredR*

**grade 12 trig**

cos(A) -1 = 0 or cos(A) = 1 arccos(1) = A = 0
*Thursday, March 11, 2010 at 2:52pm by FredR*

**ALGEBRA**

yes, it could be. You just need to change the sign, so you would have 8-y over y-4 PLUS 7y-9 over y-4
*Wednesday, March 10, 2010 at 6:16pm by FredR*

**accounting**

"Record wages expense incurred and to be paid next month" Payable implies an expense you owe.
*Monday, April 7, 2008 at 10:58pm by FredR*

**chemistry**

1/2N2+3/2H2 => NH3 or 1/3N2+H2 => 2/3NH3 so 12*2/3 = 8 moles HN3
*Wednesday, April 9, 2008 at 12:43am by FredR*

**Algebra**

= (18+4)r^2 +7s = 22r^2+7s
*Wednesday, March 10, 2010 at 10:41am by FredR*

**Science**

the formula for water is H2O. Therefore, two atoms of hydrogen are released for each atom of oxygen. You could test the gases by putting them in a balloon and seeing which one floats.
*Thursday, April 10, 2008 at 8:55pm by FredR*

**calculus**

Are you talking about the direction of the angle A from the origin to (-5,12) ? I have never seen that notation before. I agree with FredR's answer, if I interpreted the question correctly.
*Wednesday, March 10, 2010 at 8:37pm by drwls*

**math**

the probability that the 1st marble is red is 10/13. So, the probability that both marbles are red is (10/13)^2 or (100/169)
*Tuesday, March 9, 2010 at 12:50am by FredR*

**Math**

A+B = 60 (1) A/3 = B/2 A = 3B/2 (2) combine (1) and (2) 3B/2+B = 60 3B/2+2B/2 = 60 5B/2 = 60 B = 24 A = 36
*Monday, March 15, 2010 at 5:27pm by FredR*

**precal log**

4^(2x-5)=2^2*(2x-5) 8^(x-3)=2^3*(x-3) so 2(2x-5)=3(x-3) simplifying, 4x-10=3x-9 x=1
*Wednesday, April 9, 2008 at 12:54am by FredR*

**math**

u = 2d or u - 2d = 0 u + d = 5 so the matrix would be 1 -2 0 1 1 5 add -1 times the 1st row to the 2nd row. Then you get 1 -2 0 0 3 5 multiply the 2nd row by 1/3: 1 -2 0 0 1 5/3 The 2nd row tells us that d = 5/3, so u = 10/3
*Tuesday, March 16, 2010 at 12:06am by FredR*

**math**

0 = 4x^4-18x^2 = 4x^2(x^2-9/2) = 4x^2(x+sqrt(9/2))(x-sqrt(9/2))
*Monday, August 25, 2008 at 11:27pm by Fredr*

**Math(Please check)**

It doesn't look right to me sec Q - 1/sec Q = 1/cos - cos = 1/cos - cos^2/cos = (1-cos^2)/cos = sin^2/cos
*Thursday, March 11, 2010 at 12:56am by FredR*

**Maths**

the graph of y=sin(theta) is moved vertically along the y axis a distance of q to obtain y=sin(theta)+q.
*Wednesday, March 10, 2010 at 11:18am by FredR*

**trig**

The three angles of a triangle equal 180 degrees. The third angle is 80 degrees. Therefore, it is not a right triangle.
*Tuesday, April 8, 2008 at 10:01pm by FredR*

**accounting**

Cash 10,000 debit Brown, Equity 10,000 credit
*Monday, April 7, 2008 at 10:57pm by FredR*

**Geometry**

circumference = pi*D = 10m, so D = 10m/pi = 3.183m radius = D/2 = 1.59m
*Wednesday, April 9, 2008 at 12:58am by FredR*

**Math**

Since the equation is for a line, you really only need two points. If you plug x=0 into the equation, the value of y is also zero. This gives you the first point (0,0). For x=1, y=k, so the second point is (0,k). The graph of the equation is a line passing through these two ...
*Monday, April 7, 2008 at 9:00pm by FredR*

**translation please?**

Low German is an archaic dialect of the german language spoken in northern Germany. The terrain there is relatively flat, hence the name "Low".
*Sunday, April 6, 2008 at 3:20pm by FredR*

**Econimics**

Profit = revenue - TC Revenue = [Price] x [tons of coal] Take the first derivative of profit with respect to Q and set this equal to zero, then solve for Q.
*Monday, August 25, 2008 at 5:06pm by Fredr*

**Science**

flooding, water pollution, and eutrophication can be a problem in either ocean or freshwater. Aquifer depletion, overdrawing surface water, and saltwater intrusion are freshwater problems.
*Thursday, September 11, 2008 at 10:46pm by Fredr*

**psychology**

NO. 500 = A - A x 0.28 = A (1-.28) = .72A so, A = 500/0.72 = 694
*Wednesday, March 10, 2010 at 5:41pm by FredR*

**Math**

The problem asked for the ratio of length to width, with the length being the smaller of the two numbers. Therefore, the ratio would have to be less than one. If you are allowed to round off, then the nearest whole number ratio would be one. If you want to reduce the fraction ...
*Sunday, April 6, 2008 at 4:08pm by FredR*

**algebra ll**

A first order polynomial has just one root: -9x-15 = 0 or -9x = 15 or x = -15/9
*Sunday, April 6, 2008 at 4:06pm by FredR*

**Pre-Cal**

1) it is not correct. The second term would be log3(-2) and you can't take the log of a negative number. 2) it is not correct. The base angle would be 45 degrees, so the cotangent would be 1.
*Wednesday, March 10, 2010 at 5:14pm by FredR*

**Math**

let the 3 dimensions be a, b, and c where a and b are the bottom edges and c is the height. v is the volume s is the surface area a = 7b v = abc = 7b^2c or rearranging, c = v/7b^2 s = ab + 2ac + 2bc = 7b^2 + 14bc + 2bc = 7b^2 + 16bc = 7b^2 + 16bv/7b^2 = 7b^2 + (v16/7)/b set ...
*Thursday, March 11, 2010 at 1:47am by FredR*

**chemistry**

Moles of solute = 16 g / 60 g/M = = 0.267 M volume of H2O = 39g/1.3 g/ml = 30 ml = 0.03 l molarity = 0.267 M / 0.03 l = 8.89 M/l
*Tuesday, March 9, 2010 at 1:32am by FredR*

**Math**

rearranging the given line, y = (9/5)x - 4/5 (1) which has the form y = mx + b (2) where m is the slope and b is the y intercept. The new line would have the same slope to be parallel, so it would have the form: y = (9/5)x + b (3) to solve for b, input the given coordinates, ...
*Thursday, March 11, 2010 at 1:20am by FredR*

**rotations**

a = angular acceleration I = rotational inertia w = angular velocity v = linear velocity Torque = RxFT = Ia so, a = RxFT/I = (R/I)(4t-0.10t^2) w = integral(a) with respect to t v= wR
*Wednesday, March 10, 2010 at 8:34pm by FredR*

**intermediate algebra**

Area = A x B Total length = 3000 = A + 2B B = (3000-A)/2 so, Area = A x (3000-A)/2 = = 3000A/2 - (1/2)A^2 take 1st derivative 0 = 1500 - A and solve for A A = 1500 and B = 750
*Monday, March 8, 2010 at 11:26pm by FredR*

**Geometry**

A line from the center of the curve to the midpoint of the chord is 8ft. If h=half of the chord length then 10^2=h^2+8^2, or h=sqrt(10^2-8^2) = 6 the chord length is 2*h or 12ft.
*Monday, April 7, 2008 at 10:03pm by FredR*

**Albebra II**

The mean of the given numbers is 16.8. SD=sqrt(1/N sum((x-mean)^2)) =sqrt(1/9*((21-16.8)^2+(13-16.8)^2... =7.3
*Sunday, April 6, 2008 at 11:49am by FredR*

**Calculus **

dx/dt = 2 inches/min V = x^3 so, dV/dt = 2^3 = 8 cubic inches/min
*Tuesday, March 9, 2010 at 12:31am by FredR*

**Math**

2x-4y+5=a so rearranging, -4y=a-2x-5 or y=-a/4+2x/4+5/4 The slope of this line is 2/4. A line normal to this would have a slope of minus the inverse, or -4/2, or -2. So the equation of normal line would be: y=-2x
*Sunday, April 6, 2008 at 9:33pm by FredR*

**Math Algebra 2**

human hrs = 160, or 2x+6y=160 machine hrs = 200, or 2x+9y=200 minimum of 15 pants, or y>=15 must make more shirts than pants, or x>=y the maximum profit is where the equation 25x+55y=profit has a local maximum. One way to determine this is using the 1st derivative and ...
*Sunday, April 6, 2008 at 5:33pm by FredR*

**maths**

dmA/dt = cmB^2/mA where c is a constant mB=m-mA so dmA/dt = c (m-mA)^2/mA = (c/mA)(mA^2-2mmA+m^2) = cmA-2cm+cm^2/mA integrate with respect to t
*Tuesday, March 9, 2010 at 8:14am by FredR*

**college**

dist from station to trains = D ta = time in hours from when A passes station to when trains A & B meet. D = 80ta D = 88(ta-15/60) solve for ta Time at catch-up = 1:20 AM + ta
*Wednesday, March 10, 2010 at 5:49pm by FredR*

**Physics**

Newton's law of gravitation: F = G m1 m2 /r^2 let m2 = mass of ice cube and s = G m1/r^2 so, F = s m2 rearranging, s = m2/F let V = orbital speed centripetal acceleration = V^2/r For an object to remain in orbit s must equal the centripetal acceleration so, s = V^2/r
*Wednesday, March 10, 2010 at 11:08pm by FredR*

**Algebra II**

ME = 2 sqrt(.56(1-.56)/400) = 2 sqrt(.56(.44)/400) = 2 sqrt(.2464/400) = 2 sqrt(0.000616) = 2 x .0248 = 0.0496 or 4.96 percent margin of sampling error
*Saturday, April 5, 2008 at 4:23pm by FredR*

**TRIG MATH**

sin = opposite / hypotenuse so, hypotenuse = 8 opposite leg = 7 adjacent leg = sqrt(8^2 - 7^2) = sqrt(15) 1/cot = tan tan = opposite / adjacent = 7/sqrt(15) in the 4th quadrant the tangent is negative, so add a minus sign: 1/cot(theta) = -7/sqrt(15)
*Thursday, March 11, 2010 at 3:03pm by FredR*

**Physics**

v0 = 20m/s D = dist from int. = 110 - v0 x 0.50 t0 = time to stop final velocity must equal zero... 0 = v0 - a x t0 t0 = v0/a D = v0 x t0 - a x t0^2/2 substitute for t0... D = v0^2/a - a x (v0/a)^2/2 solve for a...
*Monday, August 25, 2008 at 10:41pm by Fredr*

**physics**

centripetal acceleration = a = v^2/L Period = T = 2 x pi x L / v m = mass of stone tension = f = m x a L1 = L x 1.01 if f and m are constant, then a is constant. Then v1 = sqrt(a x L1) T1 = 2 x pi x L1/v1 percentage change = 100x(T1-T)/T
*Thursday, October 16, 2008 at 9:28pm by Fredr*

**calculus/physics**

Assuming an ideal spring (linear) and using Hooke's law, the force generated by the spring is: F = -kx (1) where x is the distance the spring is stretched from the rest position. So, substituting the info into (1) you get: -10 = -k(2) or k = 5 lb/in work is the 1st integral of...
*Thursday, March 11, 2010 at 9:47am by FredR*

**Geometry**

using the Pythagorean theorem, opposite side = sqrt(13^2-12^2) sin x = opposite side / 13 tan x = opposite side / 12
*Thursday, March 11, 2010 at 12:53am by FredR*

**MATH214**

(a) 3y = x - 10 substitute in the 2nd equation 3(x-2) = x - 10 3x - 6 = x - 10 simplifing... 2x = -4 or x = -2 and y = -4 this is a unique solution (b) this system has infinitely many solutions and cannot be solved without more information. 3x + 3y = 15 divide equation by 3 (3...
*Tuesday, March 9, 2010 at 12:46am by FredR*

**algebra**

First off, the word equation implies both sides of the expression are equal. a > b implies a - b > 0 If c is < 0 then c(a - b) < 0 or ca - cb < 0 or ca < cb
*Saturday, April 5, 2008 at 10:53am by FredR*

**Geometry**

screen height = h screen width = w h = w*3/4 (1) 27 = sqrt(h^2+w^2) = sqrt((3w/4)^2+w^2) solve this equation for w calculate h from (1) movie width = screen width movie height = m m=w/2 darkened strip = (h-m)/2
*Sunday, April 6, 2008 at 6:26pm by FredR*

**trig**

I'm not sure I understand what angle the 56.4 degrees represents, but assuming it is the difference in horizontal azimuth to the pillar from the 1st setup to the 2nd setup then solution is: If the distance to the pillar is "P" then: tan(56.4)=10/P or P=10/tan(56.4)=6.6m if the...
*Tuesday, April 8, 2008 at 10:05pm by FredR*

**trig **

9cos^2(t)+3cos(t)=0 subtract 3cos(t) from both sides 9cos^2(t)=-3cos(t) divide both sides by 3cos(t) 3cos(t)=-1 cos(t)=-1/3 t=arccos(-1/3)
*Wednesday, March 10, 2010 at 5:05pm by FredR*

**Geometry**

cos(x)=15/17 so x = arccos(15/17) tan(76) = 13/x so x = 13/tan(76)
*Tuesday, March 9, 2010 at 9:17am by FredR*

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