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April 17, 2014

Search: Math - FredR

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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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