Thursday
December 18, 2014

Posts by Damon


Total # Posts: 19,936

algebra
40 + n = 10 + 4 n 30 = 3 n
December 18, 2014

Math
.65 * 80 100 (.65*80)/327
December 18, 2014

Math
(4x-1)/[(x+3)(x+4)] * (x+4)(x-3)/(2x-1) the (x+4) cancels, not much else to do
December 18, 2014

Math
I think it just blows up if x = -3
December 18, 2014

Math
x(x-2) /(x+1) * (x+1)(x-1)/[(x+3)(x-2)] = x (x-1)/(x+3)
December 18, 2014

math solution on algebra
half this triangle is a 30, 60, 90 triangle with the altitude (sqrt 3) as the long leg and half(1) the base as the short leg. (1/2) b h = (1/2)(2) sqrt 3 = sqrt 3
December 18, 2014

physics
Vi = 54 sin 39 v = Vi - 9.8 t v = 0 at top so t = Vi/9.8 at top use that t h = Vi t - 4.9 t^2 it will turn out to be 1/2 Vi t
December 17, 2014

Please look for reply before posting again
I did that a lot of questions ago.
December 17, 2014

physic
http://www.jiskha.com/display.cgi?id=1418842081
December 17, 2014

physic
been there, done that
December 17, 2014

calculus honor
assume you mean y = 2 x^3 - 4 x dy/dx = 6 x^2 - 4 if x = 1 dy/dx = 6-4 = 2
December 17, 2014

calculus honor
V = x^2 h dV/dx = 2 x h dV/dh = x^2 dV/dt = dV/dx dx/dt + dV/dh dh/dt x = 4 h = 15 dV/dt = 120 dx/dt + 16 dh/dt = 120(2) -16(3) = 240-48
December 17, 2014

done that
I did this one a while ago as well :(
December 17, 2014

calculus
A = pi r^2 A/dr = 2 pi r (which is the circumference of course, draw a circle and a ring of thickness dr on the outside and look at the added area) if r = 5 dA/dr = 10 pi =================== this is most interesting if the radius is changing with time r = k t dr/dt = k dA/dt...
December 17, 2014

physic
power = work/time work = weight * distance up = 475*9.81*10 so power = 475*9.81*10 / 24 Joules/second or Watts divide by 1000 for kilowatts
December 17, 2014

Math( Can you help me with starting this problem)
dV/dr = area of surface = 4 pi r^2 so dV/dt = 4 pi r^2 dr/dt so dr/dt = (dV/dt) / (4 pi r^2)
December 17, 2014

Physics
If .392 Newtons is pulling it at constant speed then the friction is equal and opposite to the pull .392 = mu m g = mu (.2219)(9.81)
December 17, 2014

Algebra
height = 5 (L-10)(w-10)5 = 1760 (L-10)(w-10) = 352 L = 2 w (2w-10)(w-10) = 352 (w-5)(w-10) = 176 w^2 - 15 w + 50 = 176 w^2 - 15 w - 126 = 0 (w-21)(w+6) = 0 so w = 21 L = 42
December 17, 2014

Algebra 1
slope = m = 3 10 = 3 (2) + b b = 4 y = 3 x + 4
December 17, 2014

Physics
If the angle is 90 degrees to the x axis it is all y axis 0 i + 9 j
December 17, 2014

Science-Physics
500 * 5 force in direction of motion times distance moved
December 17, 2014

physics
300 * 9.81 * 6 Joules
December 17, 2014

Physics
500 cos 37 - .5 (350 + 500 sin 37) = m a m = 350/9.81 find a 4 = (1/2) a t^2 for part be find mu for: 500 cos 37 - mu (350 + 500 sin 37) = 0
December 17, 2014

Physic
potentials add Q1/r = Q2/(.5-r)
December 17, 2014

physics
g = 9.81 m/s^2
December 17, 2014

Physics
51 = 4.9 t^2 solve for t d = 31 t v = 9.81 t vertical and 31 horizontal so speed = sqrt ( v^2+31^2)
December 17, 2014

Physics
angular speed = 2 pi(1.15/4.5) = omega v = omega * r = omega * 5.50 F = m a = m v^2/r = .655(v^2)/5.50
December 17, 2014

physics
(g - v^2/r) = .8
December 17, 2014

math
360,000 / 600 = = 3600/6 = 600
December 17, 2014

Physics
T - mg = ma T = m (g+a) = 2.13 (9.81 + 3.10)
December 16, 2014

Math
R + J = 48 J = .5 R + 6 R + (.5 R + 6) = 48 1.5 R = 42 etc
December 16, 2014

math
5 x + 3 y = 3213 y = 4 x 5 x + 12 x = 3213 17 x = 3213 x = 189 for digital 4 x = 756 for video sum = 945
December 16, 2014

pre-algebra
(-1)(-x) = (-1)(-7) +x = + 7
December 16, 2014

algebra
a = A e^rt a = 400 e^.076(1.5) a = 448.
December 16, 2014

chemistry
density ice = 4.3/5 = .86 g/cm^3 density of that oil = 27/30 = .9 g/cm^3 the ice is less dense than the oil. It will float
December 16, 2014

Math
x = log5 (27) 5^x =27 = 3^3 log3 (3^3) = log3 (5^x) 3 log 3 (3) = x log3 (5) but log 3 (3) = 1 so 3 = x log3 (5) log3 (5) = 3/x and y = log3 (5) so y = 3/x x y = 3
December 15, 2014

physics
V = omega r = 255 (.320) 382 = (1/2)V t because distance = average speed time time if a is constant solve that for t t = 764 / V 382 = (1/2) a t^2 solve for a, LINEAR aceleration alpha = angular acceleration = a/r
December 15, 2014

physics
mu m g = 88 = m g mu = 88/(32.1*9.81)
December 15, 2014

algebra
no solution 15 y = 15 y + constant
December 15, 2014

astronomy
Well, if it is a pine forest I suppose you are somewhere around 42 degrees north latitude Take a guess at 22 degrees south declination at Dec 22 add your latitude to that for example if 42 degrees north latitude the sun is 42 + 22 = 62 degrees below straight up at noon on the ...
December 15, 2014

algebra
anything except 1/0 times 0 is 0
December 15, 2014

math
when you eat half of something you multiply by 1/2 (which is the same as dividing by two)
December 14, 2014

physics
m1 = 428/9.81 m2 =195/9.81 195 - T = m2 a T = m1 a so 195 - m1 a = m2 a a = 195 /(m1+m2) which we should have said without doing all that
December 14, 2014

physics
a/g = .258 because mu m g = m a
December 14, 2014

physics
h = 6.52/sin 19.8 loss of potential E = m g h (1/2) m v^2 = m g h + (1/2) m (2.24)^2 m cancels v^2 = 2 g h + 2.24^2
December 14, 2014

calc urgent
It lies on the 45 degree line by symmetry so all we need to do is find the y coordinate, the mass does not matter, only uniform density call it 1 mass = 1/4 pi (1)^ 2 = pi/4 divide moment by this in the end moment about x axis of strip at y of width dy = y (x dy) integrate ...
December 14, 2014

algebra
let z = x^2 -3 z^2 + 27 z + 1200 = 0 divide by -3 z^2 - 9 z - 400 = 0 (z-25)(z+16) = 0 z = 25 ---> x = 5 or -5 z = -16 --> x = 4 i or -4i
December 14, 2014

math
100 (572-498)/498
December 14, 2014

Math
2*2*2*11 http://www.mathwarehouse.com/arithmetic/numbers/prime-number/prime-factorization.php?number=44
December 14, 2014

gen chem
1.38*10^3 I assume one mol Fe3O4 for every 4 mol H2 1380/4 = 345 mols of Ferric oxide 345 * (3*56+4*16) grams
December 14, 2014

Social Studies
Most say c.
December 14, 2014

Algebra
Vdownwind = v + 5 Vupwind = v - 5 5600 = (v+5) t 5600 = (v-5)(t+10) so 5600 = v t + 5 t 5650 = v t + 10 v -5 t ================ -50 = 0 +10 t -10 v or t = v-5 go back up 5600 =(v+5)(v-5) = v^2 - 25 v^2 = 5625 v = 75
December 14, 2014

Math
32 = 2^5 1 we can have 32 in a row 2 or 16*2 3 or 8 * 4 4 or 4 * 8 5 or 2 * 16 6 or 1 * 32 now of course different items can go in each of those spaces but that gives you an awful lot of choices.
December 14, 2014

math
K + ( K- 15 ) = 99 2 K = 99 + 15 = 114 K = 57
December 14, 2014

chem
AREA is NOT in cm^3 but in cm^2 Should I trust the rest of what you tyoed? Oh well 3 * 10^-6 meters(10^2 cm/m) = 3*10^-4 cm 3*10^-4 * .55*10^2 = 1.65*10^-2 cm^3 19.3 g/cm^3 * 1.65*10^-2 cm^3 = .318 g
December 14, 2014

question
yes, think so
December 14, 2014

question
Is it your fate to respond again, or is it your choice?
December 14, 2014

question
You are doing so right now.
December 14, 2014

math
to convert units, always multiply by something/the same thing in other units. For example there are ten gophs in one bork 10 gophs/ 1 bork is the same top and bottom so if I multiply by that or its inverse I change nothing. so if I have 15 borks and want to express that in ...
December 14, 2014

Sixth Grade Math
(1/4)^2 = (1/4)(1/4) = 1/16 (1/4)^3 = (1/4)(1/4)(1/4) = 1/64 etc
December 14, 2014

Sixth Grade Math
1/16 <1/4
December 14, 2014

Sixth Grade Math
2(55) + 2(88) + 2(40)
December 14, 2014

Math Question
25 + 64 = 79 = hypotenuse^2 in quadrant 2 and quadrant 4 because sin is - sin = 8/sqrt79 or -8/sqrt 79 cos = -5/sqrt 79 o 5/sqrt 79 etc, draw pictre
December 14, 2014

Math
35 (pi/180) 250 (pi/180)
December 14, 2014

algebra 2
2. 36 -4(9) = 36 -36 = 0 so repeated real root [ 6 +/- 0 ] / 18 = 1/3 and 1/3 (same, parabola just touches the x axis)
December 14, 2014

algebra 2
p^2 + 12 p + 4 = 0 b^2-4ac = 144 -16 = 128 positive so there will be two real roots [ -12 +/- sqrt(128) ] / 2
December 14, 2014

algebra 2
(b/2)^2 always :)
December 13, 2014

Math
amazing - it got the same thing I did :)
December 13, 2014

Math
here is the link Steve is sending you to (I went and looked( http://calc101.com/webMathematica/long-multiply.jsp
December 13, 2014

Math
(3x-7)(4x+3) = 12 x^2 -19 x - 21 now use distributive property 2x (12 x^2 -19 x - 21) -1 (12 x^2 -19 x - 21) = 24 x^3 - 38 x^2 - 42 x _________- 12 x^2 + 19 x + 21 =============================== = 24 x^3 - 50 x^2 - 23 x + 21
December 13, 2014

Math
slope = (y-5)/(x-2) = (0-5)/(3-2) = -5/1 or y - 5 = -5 (x-2) =========================== huh, it says the answer right in the sentence y = 10.5 x + 65
December 13, 2014

physics
P V = n R T
December 13, 2014

physics
delta L/34 = coef of expansion * delta T
December 13, 2014

physics
Force * time = change of momentum = 125 * 33 often called impulse Why on earth would a baseball player push on a baseball for 33 seconds? Is that a typo?
December 13, 2014

math
4 5 or 6 p(passed) = .6 p(failed) = .4 Binomial distribution for example for 4 of 6 passed C(6,4) .6^4 .4^2 C(6,4) = 6!/[ 4!(2!)] = 6*5/2 = 15 15 * .6^4*.4^2 = .311 do that also for 6,5 and for 6,6 and add those three results
December 13, 2014

math
I am going to assume that you mean [ (n^2-4)/(n^2-2n) ] * n/(n^2+10n+16 ) Immediately you can see that n = 0 and n = 2 are excluded from the domain, also if n^2+10 n + 16 = 0 which is if n = -2 or -8 now [(n-2)(n+2)/n(n-2)] *n /[(n+2)(n+8)] = 1/(n+8)
December 13, 2014

precalculus
if a denominator is zero, you have a vertical asymptote (look at 14 as x becomes 2) if the function becomes constant you have a horizontal. look at 14 as x gets big positive and as x gets big negative
December 13, 2014

math
14 1/3 = (14*3+1)/3 = 43/3 and 43/3 = 86/6 so 86 sixths
December 13, 2014

History
agree
December 13, 2014

Algebra
1 , x^2 , 9 x^2 - 1 = d -x^2 + 9 = d --------------- 0 + 8 = 2 d d = 4 so 1 , 5 , 9 x = sqrt(5)
December 13, 2014

Geometry
Remember anything with a pointy top and straight sides has volume of base area times height times (1/3) V = (1/3) pi r^2 h
December 13, 2014

math
10 h >/= 55 so h >/= 5.5 the top one, assuming she runs an average speed for the week :)
December 13, 2014

Algebra
a , a+d, a+2d ..... a+(n-1)d or an = a +(n-1)d a5 = a + 4 (1) = 11 so a = 7 7 * 8 = 64-8 :)
December 13, 2014

algebra
It is certainly off. Perhaps it means -16 t^2 + zero initial speed up + 34 feet high but it is impossible to be certain. Good luck. The only thing you can be sure of there is -16 t^2
December 13, 2014

typo
no way On earth in the ancient feet, inches, slugs, seconds system h = Hi + Vi t - 16 t^2 please get it right so someone can answer
December 13, 2014

math
Google says 5.6 lb/gal = oz/gal yields 5.6 lb/gal = 89.6 oz/gal which is what happens if you have 16 oz/ lb 16 *5.6 = 89.6
December 13, 2014

statistics
I suppose you would use the mean but a mean of 3.8 with a standard deviation of 17.4 is pretty strange. in general this is handy: http://davidmlane.com/hyperstat/z_table.html
December 13, 2014

Physics
distance = speed time time so wavelength = speed of sound * period T but f = 1/T so wavelength = speed of sound / f f = speed /wavelength look up speed of sound at 20 C in your book (different tables available)
December 13, 2014

Geography
Oh, thanks, I thought she maybe meant the waterfall looked like Abraham Lincoln with a full moon and therefore did not reply.
December 13, 2014

Reiny or Steve can you help ?
I can not.
December 13, 2014

Algebra
n</= 2t+3 ??? is that not any n equal to or greater than -3
December 13, 2014

Physics
You are welcome.
December 13, 2014

Physics
.05 m on a side volume = .05^3 = 125 * 10^-6 m^3 mass of water displaced = 10^3 kg/m^3 * 125*10^-6 m^3 = .125 kg Archimedes says force up = weight of water displaced g = 10 m/s^2 so m g = 1.25 Newtons
December 13, 2014

scholarship 7th std
try dividing 56324 by 12 then 54324 and get 4527 exact so 4
December 13, 2014

algebra 2
4 x^2 + 4 x - 15 = 0 x = [ -4 +/- sqrt(256) ]/8 = [ -4 +/- 16] / 8 =12/8 or 20/8 = 3/2 or -5/2 or (2x-3)(2x+5) = 0
December 13, 2014

Algebra
|a-b| = 20 - |b-c|-|c-a| If b>c and c>a |a-b| = 20 - b + c - c + a =20+(a-b) if a>b then a-b = 20 + a-b and a-b = 0 if a < b then b-a = 20 -b+a 2b-2a = 20 |a-b| = 10 try others but I think you will find 10
December 13, 2014

science
anything that is different at one end like F or A
December 13, 2014

math
+i +j +k +1 -2 -1 +3 -1 +1 ================== cross product (-3)i + (-4)j + (+5)k so yes V = -3 i - 4 j + 5 k opposite to that is also parallel +3 i + 4 j -5 k add any old point to that and it is still parallel
December 13, 2014

Science
Hey, really, in one sentence? This might help: https://www.caymanchem.com/app/template/chemAssistant,Tool.vm/itemid/4001
December 13, 2014

math
geometric series a + a r + a r^2 + a r^3 ... a r^10 a =19,000 r = 1.04 S = a (1-r^n)/(1-r)
December 13, 2014

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