Saturday
August 23, 2014

Posts by Damon


Total # Posts: 17,988

algebra
(m-1) or (1-m) 7 - m + 1 = 3 or 7 -1 + m = 3 m = 5 or m = -3 check if m = 5 |m-1| = 4 4 = 4 good if m = -3 |m-1| = 4 good
May 15, 2014

Math - Int Trig
for every a+bi there is a a-bi solution (x-2i)(x+2i)(x-3i)(x+3i) = 0 (x^2 +4)(x^2+9) = 0 x^4 + 13 x^2 + 36 = 0 ================= (x-i)(x+i)(x+10) = 0 etc
May 15, 2014

Precalculus
2 x^2 + 4 x = y^2 - 4 y +4 2 x^2 + 4 x = (y-2)^2 x^2 + 2 x - (1/2) (y-2)^2 = 0 x^2 + 2 x + 1 - (1/2) (y-2)^2 = 1 (x+1)^2 - (y-2)^2/(sqrt 2)^2 = 1 Hyperbola, you look up the stuff for it.
May 15, 2014

math
when x = 0, y = 3 so make a point (0,3) when y = 0, x = -1 so make a point (-1,0) the line goes through those two points and off into the distance left and right
May 12, 2014

Science
sorry, typo 1.5 * 63 Joules
May 12, 2014

Science
4.5 * 63 Joules
May 12, 2014

Algebra 1 Answer Evaluation
Yes, the only solutions to the first problem are the imaginary numbers +/- i sqrt 7 where i is the sqrt of NEGATVE one
May 12, 2014

Algebra 1 Answer Evaluation
x^2 + 0 x + 7 = 0 x = [ 0 +/- sqrt(-28) ]/2 x = +/- 2 sqrt -7/2 x = +/- sqrt(-7) or +/- i sqrt 7 ================================= x^2 - 0 x -16 = 0 x = [ 0 + /- sqrt (0 +4*16) ]/2 x = +/- 2*4/2 x = +/- 4 what else is new :)
May 12, 2014

math
position = speed * time + initial position or d = s t + di 90 = s (2) + di 135 = s(3) +di subtract 45 = 3 s - 2 s = s and 135 = 45(3) + di or di = 0 so in the end d = 45 t check that for example does 270 = 45(6) ???
May 12, 2014

math
-4 = (1/4) (0) + b b = -4 y = (1/4) x -4 or 4 y = x - 16 graph that line
May 12, 2014

math
(-2 - 2) / (4-6) -4 / -2 2
May 12, 2014

trig
sin 15 = 135/ hypotenuse tan 15 = 135/d along ground
May 12, 2014

Calculus answer check
s = .7 t^2 ds/dt = v = 1.4 t 4 = 1.4 t t = 4/1.4 = 2.86 seconds It asked for t given v = 4 m/s
May 9, 2014

maths
(p-7)(p+6)
May 6, 2014

Pre - Cal
start at the middle up 4 end up 20 (16 above middle y = kx^2 16 = k(40)^2 16 = k (4)^2(10^2) 1 = 100 k k = .01 so , adding the 4 at the middle y = 4 + .01 x^2 at x = 20 y = 4 + .01 (4)(100) = 8
May 5, 2014

Pre - Cal
(x+3)^2 = a(y-1) (4+3)^2 = a (-5-1) 49 = -6 a a = -49/6 x^2 + 6 x + 9 = -49/6 (y-1) x^2 + 6 x + 54/6 = - 49 y/6 + 49/6 x^2 + 6 x - 5/6 = -49 y/6 6 x^2 + 36 - 5 = -49 y
May 5, 2014

Pre - Cal
4y^2+4y-16x=0 y^2 + y = 4 x y^2 + y + 1/4 = 4 (x + 1/16) (y+1/2)^2 = 4 (x+16) vertex at (-16 , -1/2)
May 5, 2014

Calculus
integral f(t) dt from 5 to 7 sin 7 - sin 5 = .657 - .959 = -.30 if angle is in radians or .121 - .087 = .0347 if angle is in degrees I suspect you left a pi out or something.
May 5, 2014

English
d cautionary is correct
May 5, 2014

Help math only 1 question easy!
3 * 2 * 1 = 6
May 5, 2014

physics
distance = speed * time wavelength = speed * period = speed / frequency = 3 * 10^8 m/s / 76 = 3.95 * 10^6 meters = 3950 km Either you have a typo or you are talking about a super low frequency system that is used to communicate with submarines underwater. It is 360 degrees ...
May 5, 2014

Physics
7 m/s * 3600 s/hr /1000 m/km = 25.2 km/hr which is about 15 miles/hour 10m/s = 36 km/hr which is about 22 miles/hour If you are really, really fast you might run 100 meters in around 10 seconds :) I am sure you can think of something :)
May 5, 2014

Algebra
-10 (x^3 - 3 x + 2) /[-5(x-1)] 2 (x^3 - 3 x + 2) / (x-1) 2 (x^2+x-2)(x-1)/(x-1) 2 x^2 + 2 x -4
May 5, 2014

pre calculus
Vx = 1200 cos 6 Vy = 1200 sin 6 |V| = sqrt (Vx^2 + Vy^2)
May 5, 2014

maths
18 - 24 j 9 - 8 j
May 5, 2014

maths
That is not an equation.
May 5, 2014

maths
[(x+a)(x+b)] / [(x+a)(x+a)] = (x+b)/(x+a)
May 5, 2014

math?
82 - 5(15) = 82 - 75 = 7
May 5, 2014

AP Physics B
4.2 * heat of fusion of water 4.2 * 79.5 kcal/kg = 334 kCal
May 5, 2014

maths
I have no idea. You did not say how much he spent total.
May 5, 2014

physics
The net horizontal force is 35 -2.9 = 32.1 N
May 2, 2014

Calculus
if dP/dx = x e^-x^2 then p = -(1/2)e^-x^2 + C 15,000 = -.5 /e + C agree so C = 15,000 + .1839 = 15,000.1839 so p = -(1/2)e^-x^2 + 15,000.18
May 2, 2014

Physics/Calculus
f = -k x 21714 = k (3) W = (1/2) k x^2 do for x = 1/2 inch then for 1 inch and subtract the half inch result
May 2, 2014

Calculus
work = integral w dz w = 4.5 (180-z) so work = integral from z = 0 to z = 180 of 4.5 (180-z)dz = 4.5*180 (180) - 4.5 (1/2)(180)^2 = (1/2)(4.5)(180)(180) or half the weight over the whole distance of course :)
May 2, 2014

Physics
half the weight times the distance
May 2, 2014

Physics
twice as far (1/2) k x^2 where k = force/distance
May 2, 2014

Math
2*8 + 2*w = 30
May 2, 2014

Calculus Help and Check
I gave you my answer which is quite different.
May 1, 2014

calculus help
delta x = pi/8 x at pi/16 , 3pi/16, 5pi/16, 7pi/16 so 2 cos^3 pi/16 = 1.887 2 cos^3 3 pi/16 = 1.1497 etc add them up and multiply by pi/8
May 1, 2014

calculus help
Well, I gave you my answer which is quite different.
May 1, 2014

calculus help
sorry, extra dx in there = f(q) - f(p) f(q) = ln (8+3sin x) f(p) = ln (8+3cos x) f(q)-f(p) = ln [ (8+3sin x)/(8+3cos x) ]
May 1, 2014

calculus help
the derivative of a definite integral is how much the area changes as you change the limits. d/dx Int from p(x) to q(x) of f(v)dv = [f(q)-f(p)]dx (draw a sketch of that graph)
May 1, 2014

Constituion
Read the text. I gave a link to it :)
May 1, 2014

Constituion
http://www.archives.gov/exhibits/charters/constitution_transcript.html
May 1, 2014

Constituion
Yes, Article 1 is about Congress
May 1, 2014

Math
domain is where the function is defined. If the denominator is zero, no calculator can produce a big enough answer :)
May 1, 2014

Constituion
All of it.
May 1, 2014

Chemistry
.25 (100/65)
May 1, 2014

Calculus Help Please Urgent!!!
Oh, I take that back, their function includes the proper period and amplitude.
May 1, 2014

Calculus Help Please Urgent!!!
Hey, I just gave you the method, not the answer You have to put in the given period and amplitude
May 1, 2014

Calculus Help Please Urgent!!!
dV/dt = f(t) = (3/10) sin (2 pi t/3) V = integral of that dt = -(3/10)(3/2pi) cos (2 pi t/3) = -(9/20pi)cos (2 pi t /3)
May 1, 2014

Chemistry
I also typed it wrong 4.184 not 4,184
May 1, 2014

Chemistry
Specific heat water - 4.187 kJ/kgK = 4,187 J/gC
May 1, 2014

Chemistry
change of water temp = +2 deg C heat energy into water = Cwater*m *2 deg heat energy out of rock = 532.1 J so 531 J = Cwater * m * 2 Cwater is specific heat of water in Joules/(gram deg C)
May 1, 2014

science
carbon credits? http://en.wikipedia.org/wiki/Carbon_credit
May 1, 2014

Physics
Now think! Did the mass of the sphere change? Was it a nuclear reaction? What dos the fluid pressure have to do with good old Archimedes? How long would the temperature of the sphere and the fluid stay different? LOL How did the volume inside the sphere change if the glass did...
May 1, 2014

Pysical science
.05 kg = 50 grams 50 g / 7.9 g/cm^3 = (50/7.9) cm^3
May 1, 2014

Physics quick help please
Voltage * charge = work done by E field on charge Same thing really Volts = E * d Use METERS volts, Coulombs
May 1, 2014

PHYSICS URGENT
Volts + charge = work done If + charge moves in direction of E field, potential goes down .02 meters E = V/d
May 1, 2014

algebra
sure (5) /2 = 2 Remainder 1 which is exactly the same as 2 1/2 That is really what "remainder means" .
May 1, 2014

world history
That is corrct.
May 1, 2014

Physics
P V = NRT = constant if n and T constant so P1 V1 = P2 V2 if V2 is half V1 then P2 is TWICE P1 difference in pressure from one side of piston to the other = 1 atm which is about 10^5 Pascals or Newtons.m^2 F = P A = 10^5 newtons.m^2 * pi .23^2 / 4
May 1, 2014

Math
For example (-1,-3/4) (4,-3/4) (4,3) (-1,3)
May 1, 2014

Physic II
Nothing happens with 100% efficiency
April 30, 2014

Physics ? geometry
I do not know V, the initial Volume of gas so can not do the problemP V = n R T P dV + V dP = 0 if n R and T do not change P initial = 10^5 Newtons/m^2 ( or Pacals) dV = (24*10^-4) x V = I have no idea. You left this out. dP = 5*9.81/(24*10^-4)
April 30, 2014

physics
Ke = (1/2) m v^2 + (1/2) I omega^2 v = omega r so omega = v/r Ke = (1/2) m v^2 + (1/2) I v^2/r^2 = m g (.25) (1/2) m v^2 + (1/2) (2/5) m v^2 = .25 m g (7/10) v^2 = .25 * 9.81
April 30, 2014

geometry
17 * 17 * 1/6 = 48.167 ft^3 1 yd^3 = 3*3*3 = 27 ft^3 48.167 ft^3/27 ft^3/yd^3 = 1.784 yd^3 1.784 yd^3 * $ 40/ yd^3 = $ 71.36 by the way, concrete people refer to a cubic yard as a "yard". They are not likely to send a truck with 1.784 yards, so you will pay for 2 ...
April 29, 2014

English
A is wrong. you're means "you are" not "your".
April 29, 2014

Calculus Help and Check
calculate C' = dC/dx at x = 2000 then dC = C' dx dC = C' (4000-2000) C' = 3 - 20 + 40 = 23 dC = 23 (2000) = 46,000
April 29, 2014

Physics
.6 seconds is quarter period so period = .6*4 = 2.4 s
April 29, 2014

Physics
(1/2) m Vmax^2 if x = a sin w t v = a w cos wt so Vmax = a w a is amplitude w is circular frequency = 2 pi f so Ke max = (1/2) m (a^2 w^2) = 2 pi^2 m a^2 f^2
April 29, 2014

Math
Perhaps they want us to assume it is possible. 4 out of the 15 sides are less than 5 so about 4/15 in each roll so in each roll the probability of NOT getting less than 5 is 11/15 so the probability of NEVER getting less than 5 is (11/15)^45 so our answer is 1 - (11/15)^45 ...
April 29, 2014

Math
The concept of a 15 sided cube startles me. Did you make this question up yourself?
April 29, 2014

social studies 9
What country?
April 29, 2014

Math
Hector cash = 450 + 20 t Tim cash = 1200 - 30 t Are you interested in how many weeks until they are equal? If so 1200 - 30 t = 450 + 20 t 50 t = 1200-450 t = 15 weeks
April 29, 2014

Physics
(1/2) m v^2 = potential energy potential energy is mgh for low altitude but that will not work for high altitude where g is less than 9.81 m/s^2 increase in potential = G M m (1/Re - 1/(Re+h) call z = Re +h (1/2) v^2 = G M (1/Re - 1/z) solve for z then h = z - Re
April 29, 2014

Physics
v^2/r = 8.26 F/m = local g = G M/r^2 = 8.26 6.67*10^-11 * Mass earth/r^2 = 8.26 solve that for r then v^2 = 8.26 r solve for v v T = 2 pi r T = 2 pi r/v
April 29, 2014

history
http://www.ers.usda.gov/data-products/farm-income-and-wealth-statistics/ranking-net-value-and-farm-income.aspx
April 29, 2014

math
The dimensions are divisible by 6 except 15 so the cubes will fit exactly on the bottom area of 30*18 = 6*6 *15 so 15 cubes covers 30*18 now it can only be 2 cubes high because of the 15 inch height limitation so 15*2 = 30 cubes
April 29, 2014

calculus
Hey, this is getting a little silly.6x+30 = 6 (x+5) and 3 (x^2-25) = 3 (x+5)(x-5) I think you better forget the calculus and work on basic factoring.
April 29, 2014

calculus
(x-3) cancels top and bottom
April 29, 2014

calculus
I am sure you mean (x^2-1)/(5x+5 ) again factor x+1 cancels
April 29, 2014

Information Literacy
Building Design 27 July 2012 Note: It is real: http://www.bdonline.co.uk/buildings/london-2012-olympic-park/5040360.article
April 29, 2014

Algebra
x^2 + (x+4)^2 = 18^2 = 324 2 x^2 + 8 x + 16 = 324 2 x^2 + 8 x - 308 = 0 x^2 + 4 x -154 = 0 x = [ -4 +/- sqrt (16 + 616)]/2 = [-4 +/- 2 sqrt 158 ] /2 = -2 +/- sqrt 158 use + root 10.57 14.57
April 29, 2014

maths
I do not know any trick, sorry 9.45 * 10^12
April 29, 2014

physics
m g = 1500* 9.81 m g sin theta = 1500 * 9.81 * sin 2 = 514 N propulsive force Power = force * speed = 514 N * 20 m/s = 10.27 KW
April 29, 2014

precalc
arrgh, English units :( r = (11/12) ft 2 pi r = 5.76 ft/revolution 600 revolutions/min * 60 min/hr =36,000 rev/hr 36,000 rev/hr * 5.76 ft/rev = 207,360 ft/hr 207,360 ft/hr * 1 mile/5280 ft = 39.3 miles/hr
April 29, 2014

precalc
45 * 2 pi radians/min = omega v = omega r v = 45*2 pi * 16
April 29, 2014

precalc
(35 +30) * pi/180 radians times r = distance
April 29, 2014

precalc
Now wait a minute. You can look this up in your text or sketch it out on paper. There is no need to ask me. for example area of sector = (angle/2pi)area of circle I am sure you can do that isoceles triangle in there push down clutch, engage gears :)
April 29, 2014

Math
5/1.25 = x/6 x = 30/1.25
April 29, 2014

chemistry
If it is BASIC, it has an H+ concentration LESS than 10^-7 This is an acid !
April 29, 2014

math
g / (g/hr) ---> hr
April 29, 2014

math
gallons per hour hours time = total gallons / rate in gallons per hour
April 29, 2014

phisics - no problem/ no copy and paste
You can not copy and paste here
April 29, 2014

math
V = pi r^2 h = pi (4)(9) = 113 s^3 = 113 s = 4.84 cm
April 28, 2014

Algebra
2*2*2 = 8
April 28, 2014

Algebra
i = .089/2 = .0445 X = 35,000 (1.0445)^(2t)
April 28, 2014

College Algebra
w = c L^3 w = c [512] [ (1-e^-t)^3 ] = 512 c ----------- aside multiplication problem (1-e^-t)^3 = (1-e^-t)(1 - 2e^-t +e^-2t) =1(1 - 2e^-t +e^-2t) -e^-t(1 - 2e^-t +e^-2t) = 1 - 2e^-t +e^-2t -e^-t +2e^-2t -e^-3t = 1 -3e^-t +3e^-2t -e^-3t ------------------ w = 512 c [1 -3e^-t +...
April 28, 2014

MATH 12
4 s h + s^2 = 12 so h = (12-s^2)/4s v = s^2 h v = s^2 (12-s^2)/4s = (12 s^2 -s^4)/4s v = 3 s -(1/4) s^3 dv/ds = 0 for max = 3 - (3/4) s^2 (3/4) s^2 = 3 s^2 = 4 s = 2 h = (12 - 4)/8 = 1
April 28, 2014

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