Saturday
July 30, 2016

Posts by Damon

Total # Posts: 26,601

Equations
Plug and Chug 3 s + 5 a = 1150 but s+a = 300 so a = 300-s 3 s + 5 (300-s) = 1150 3 s + 1500 - 5 s = 1150 2 s = 350 s = 175
April 15, 2016

Math/Algebra
S = 4 x M = 3 x B = 2 x total = 9 x = 2178 so x = 242 M = 3 x = 726
April 15, 2016

no way
a , b b - a = 29 5 a = 2 b what result is one? Makes no sense. Ignoring that. 5 a = 2 (a+29) 3 a = 87 a = 87/3
April 15, 2016

L.o
Afraid of strangers
April 15, 2016

School
No, it is not.
April 15, 2016

where?
I live in Massachusetts. We do not elect judges anywhere.
April 15, 2016

math
downstream speed = u + 4 upstream speed = u - 4 20 = (u+4) t 10 = (u-4)t so 20/(u+4) = 10/(u-4) 10 u + 40 = 20 u - 80 10 u = 120 u = 12 miles/hr
April 15, 2016

English
1. lower than usual price 2. at whatever price In 3 through 6 it is the price of the product, not the product, which is 30% off.
April 15, 2016

Math--Parametric Equations
for the center: x = 24 cos 45 * t = 17 t y = 24 sin 45 * t = 17 t relative to center initial angle of point from x axis Ai = 90 degrees (on y axis) r = 1.5 Xrel = r cos A Yrel = r sin A A = 90 + (360*3)t A = 90 + 1080 t cos A = cos (90 + 1080t) = -sin(1080 t) trig identity sin...
April 15, 2016

Algebra
3, whoa, climbing faster try y(n+1) = 3 y(n) geometric ratio is always 3 or r = 3 y = 1.4 * 3^(x) try x = 4 y = 1.4 * 3^4 = 1.4 * 81 = 113.4 it worked
April 15, 2016

Algebra
2. constant d again y = m x + b y = 2.3 x + 3
April 15, 2016

Algebra
1. note constant d = 2 arithmetic sequence straight line of slope 2
April 15, 2016

Math
right :), sorry mistook < for =
April 15, 2016

Math
ah, 4^4 * 4^4 = 4^8 like 10^1 * 10^1 = 10^2 NOT 10^1 try C)
April 15, 2016

Math
yes, yes, but numbering messed up.
April 15, 2016

Physics
You are welcome.
April 15, 2016

Physics
T = 15/25 = .6 second C = 2 pi R = 2 * 3.14 * .95 = 5.97 meter a) v = C/T = 9.94 m/s b) v^2/R = 9.94^2/.95 = 104 m/s^2 wow, 10 g c) F = m a = .025*104 = 2.6 Newtons
April 15, 2016

Physics
Just add
April 15, 2016

Algebra
good grief, g = 32 ft/s^2, old text :) T = 2 pi (L/32)^(1/2) T = 2 pi (4/32)^.5 = 2.22 seconds
April 14, 2016

HISTORY HELP plsssssssss
Well, it said it was "good" if it came from the "Maker of the world".
April 14, 2016

Math
A = L * w Perimeter = L + 2 w = 36 so L = 36-2w A = (36-2w)w -2 w^2 + 36 w = A w^2 - 18 w = -A/2 w^2 - 18 w + 81 = -A/2 + 81 (w-9)^2 = -(1/2)(A-162) vertex at w = 9 area = 162 ft^2 ==================== check if w = 9 L = 36 - 18 = 18 area = 162, sure enough
April 14, 2016

Math
x(x+5) = x^2 + 5 x
April 14, 2016

Math - Please check!
1. yes 2. yes 3. pi*3.5^2 = 38.5 yes
April 14, 2016

i really need help with science pls help
If the results are conflicting I would pick A If the results are from different branches of the same study area I would pick B
April 14, 2016

Math
Oh, Pythagoras ! http://www.mathsisfun.com/pythagoras.html
April 14, 2016

Math
well, I happen to know that 3^2 + 4^2 = 9+16 = 5^2 so 30^2 + 40^2 = 50^2 so that is a right triangle.
April 14, 2016

Math
One does not normally give heading of a breeze. You specify the direction it comes FROM. However this seems to be specifying the direction it is GOING like it were a current so I will assume that. north speed = Vn = 145 cos 84.5 + 24.6 cos 68.4 east Speed = Ve = 145 sin 84.5...
April 14, 2016

Pre-Calc
logb(4) +logb((x^7 y^2)/(z^4))^.5 logb(4) +logb((x^7 y^2)/(z^4))^.5 logb(4)+3.5 logb(x) + logb (y) - 2 logb (z)
April 14, 2016

Physics
Fx = 186 cos 22 Fz = 186 sin 22 186 cos 22 - 120 = 61 a a = (1/61) 52.5 = .86 m/s^2 v = a t = .86 t average v = .43 t 2.5 = .43 t * t t = 2.41 seconds so v = .86 (2.41) = 2.07 m/s
April 14, 2016

typo
surely something parabolic like r(t) = -30 t^2 - 390 t and that is also really nonsense on this planet where h = Vi t - 4.9 t^2 in metric units or h = Vi t - 16 t^2 in feet etc but anyway well, when t = 0 it starts we hit he ground again when 30 t^2 = 390 t or t = 13 seconds ...
April 14, 2016

Physics
m g h + (1/2) m v^2 = energy gain during trip = 610 * 9.81 * 49 + (1/2) * 610 * 24.7^2 in Joules divide that energy gain by 20.5 seconds to get Watts
April 14, 2016

Math
x(1.5) + 12(4) = (x+12) * 3 1.5 x = 12 x = 8 ============================ check 8*1.5 + 12*4 = 60 8+12 = 20 pounds total 20 * 3 = 60
April 14, 2016

Stats - Help!!!
Kasheta speed =d/22.3 Louisa speed = d/26.4 so Kasheta speed/Louisa speed = 1.18 Kasheta is 18% faster. That is meaningful.
April 14, 2016

physics
a) equal and opposite b) -charge on A, + charge on B Vb > Va so negative c) electrons the electrons move through the wire from A side to B side BUT the current is defined as if it were positive charges moving through the wire SO current through resistor from B side to A side
April 14, 2016

science-college physics
r = .001 meter Area = pi r^2 = 3.14 * 10^-6 m^2 delta L/L = F /( E A ) delta L/1 m = F /(2*10*8 *3.14*10^-6) F/delta L = spring constant = k 628 N/m now I am sure you can do the sqrt (k/m) thing
April 14, 2016

physics
FORGET k, 10^-6 etc etc which are the same for both put -9 at x = 0 put + 16 at x = 1 from negative x a + 1 charge pulled right to x= 0 but pushed left from x = +1 so left of 0, final x is negative 9/x^2 = 16/(1-x)^2 9 (x^2 - 2 x + 1 ) = 16 x^2 9 x^2 - 18 x + 9 = 16 x^2 7 x^2...
April 14, 2016

Physics
F = m v^2/r where m = 720 v = 48000/3600 = 13.33 m/s r = 200
April 14, 2016

science
P = i V = .75 * 2.4 = 1.8 Watts
April 14, 2016

math
if any dimension is multiplied by x and the shape is similar, then every length is multiplied by x including the perimeter. Google scale ratio anyway (1/2) * 54 = 27 meters
April 14, 2016

PHYSICS
to add the voltages you just add by the way, Voltage is a potential and scalar, not a vector
April 14, 2016

mathematics
sqrt (12^2 + 6^2)= sqrt 180 = 6 sqrt 5
April 14, 2016

math
I can only guess you mean 5% and 10% 1.05 x = 2142 so x = 2040 then do your 10% 1.1 (2040) = 2244
April 14, 2016

algebra
the first way is brute force finding where two lines hit The second way is called "elimination". The third way is called "substitution". They are all ways o find the intersection of those lines.
April 14, 2016

algebra
or substitute x = 1 - 3y use that in the second one -3(1-3y) -3y=15 -3 + 9 y -3 y = 15 6 y = 18 y = +3 again
April 14, 2016

algebra
there are lots of other ways, like add the two equations +1 x + 3 y = 1 -3 x - 3 y = 15 ---------------- add -2 x = 16 x = -8 then go back and get y
April 14, 2016

algebra
first equation is the line y = -(1/3) x + 1/3 second equation (-x-y=5) is the line y = - x - 5 so -x-5 = -(1/3)x + 1/3 2/3 x = -16/3 x = -8 then y = 3 ------------------- check -8+9 = ? 1 yes +24 - 9 = ? 15 yes
April 14, 2016

calculus
two similar triangles First the stationary situation x/5.5 = (x+14)/16.5 5.5(x+14) = 16.5 x 11 x = 77 x = 7 now start moving x = length of shadow y = woman to pole (x+y)/16.5 = x/5.5 16.5 x = 5.5 x + 5.5 y 11 x = 5.5 y 2 x = y so 2 dx/dt = dy /dt if dy/dt = -6 then dx/dt = -3 ...
April 14, 2016

rs aggarwal math class 8 chapter 8 soluation
n / (2n -2) (n + 3)/(2n+1) = 2/3 3(n+3) = 2 (2n+1) 3 n + 9 = 4n + 2 n = 7 so n/(2n-2) = 7/12
April 13, 2016

Precalculus
p = Pi e^kt 2 = e^10 k ln 2 = 10 k .693 = 10 k k = .0693
April 13, 2016

I am not sure
(x+y)(y+z)=5(x+y)(y+z) one cow = 5 cows Please check for typos
April 13, 2016

Algebra
>>>>>>> y - 4 --------------------- (y+3) | y^2 - y + 4 >>>>>>> y^2 +3y -------------------- >>>>>>>>>>>> -4y + 4 >>>>>>>>>>>> -4y -12 -------------------- >>...
April 13, 2016

science
m g h = 700 * 9.81 * 30 Joules Unless you find some way to store that energy and use it to move the elevator back up.
April 13, 2016

geography
Seeing as how these folks pioneered seafaring in the Indian Ocean I would consider that an important part of their economic activities : http://www.cambridge.org/us/academic/subjects/archaeology/archaeology-asia-sub-saharan-africa-and-pacific/archaeology-seafaring-ancient-...
April 13, 2016

Math
10/24 = 5/12 so this is a 5, 12, 13 right triangle 39/13 = 3 (of course 26/12 is 3 also) so 5*3 = 15
April 13, 2016

statistic
http://davidmlane.com/hyperstat/z_table.html
April 13, 2016

Geometry
120/360 = 1/3 so (1/3) pi r^2 or (1/3)(3.14)(40)(40)
April 13, 2016

algebra
.08 (25,300) .92 (25,300)
April 13, 2016

math
2058 = 14 * w * 3 w w^2 = 49 w = 7 L = 21
April 13, 2016

science help pls pls
http://lcogt.net/spacebook/parallax-and-distance-measurement/
April 13, 2016

math
1/3 +1/4 = 4/12 + 3/12 = 7/12 so 5/12 = 10 are blue blue = 24 , got it ?
April 13, 2016

Math
2 n + 5 = 5 n-16 or = 16-5n 21 = 3 n or 7 n = 11 n = 7 or n = 11/7 ====================== check if n = 7 14 + 5 = ??? 35 - 16 19 = 19 check yes if n = 11/7 22/7 + 5 = ???? 16 - 11/7 22/7+35/7 = ??? 112/7 - 55/7 57/7 = 57/7 yes, check
April 13, 2016

Calculus
h is height x is distance from wall sin T = h/13 cos T = x/13 d cos T /dt = - sin T dT/dt =(1/13)dx/dt or dT/dt = -(1/(13 sin T))(dx/dt) sin t = h/13 at x = 5 h = sqrt (169 - 25) = 12 so sin T = 12/13 so dT/dt = -(1/12)dx/dt = -1/12 radians/second
April 13, 2016

Science
P1/T1 = P2/T2 140 + 273 = T1 216 + 273 = T2 P1 = (T1/T2)22.3
April 13, 2016

AP Physics
Area L = volume so if 3 times longer, then 1/3 the area 3 * 21 = 63 ohms
April 12, 2016

AP Physics
Power = V^2/R = 5434 Watts = 5.434 kw hours = 31*9 = 279 hours so 5.434 kw * 279 hr *.15/(kw hr) = $ 227.41
April 12, 2016

Maths (Proof)
If you can squish it, it is no longer regular. The sides may be the same but not the angles. Think about a square with hinges at the corners if you squish it into a parallelogram, it still has 4 equal sides but is no longer a regular polygon.
April 12, 2016

Maths (Proof)
sqrt (2^2 + 5^2) = sqrt 29 agreed the distance from -5,5 to 5,5 is 10 the distance from 0,-7 to 7,0 is 7 Oh my :( not really regular I guess you will have to make a model with 8 equal sides and see if you can sqwish it :) I think you can.
April 12, 2016

Physics
T = k sqrt L/g sqrt(1.03/9.82) = sqrt (L/9.77) so L = 9.77 (1.03/9.82)
April 12, 2016

Math
if 40 hours is normal week length 40 x + 7(1.5 x) = 375.78
April 12, 2016

Science
a= -16 m/s / t = acceleration but what is t? average speed during stop = 24/2 = 12 m/s so time = 80/12 = 20/3 seconds to stop so a = -16(3/20) =-12/5 = -2.4 m/s^2
April 12, 2016

Maths
B 3 (sin x/ cos x) = cos x 3 sin x = cos^2 x 3 sin x = (1 - sin^2 x) sin^2 x + sin x -1 = 0 let z = sin x z^2 + z - 1 = 0 z = [ -1 +/- sqrt (1+4) ]/2 z = [-1 +/- 2.24 ]/2 z = sin x = .618 or something too big to be a sin of anything
April 12, 2016

Maths
A x = 0 is a solution also sin x = 2 cos x is tan x = 2 that happens at x = 63.4 degrees and at x = 243.4 degrees convert those to radians by multiplying by pi/180
April 12, 2016

U.S history
C was much later than the Declaration, in individual states then as Amendments 1 - 10 of US Constitution after Rev War. So C I am not at all sure I agree with you on the second one, think exactly the opposite note the word ANTI- Federalist http://www.google.com/url?sa=t&rct=j&...
April 11, 2016

Geometry
pi Ro^2 L - pi Rin^2 L = pi L (Ro^2-Rin^2) = pi * 400 (.025^2 - .02^2)
April 11, 2016

Proof read what you typed!!
to use conservation of momentum you must know all masses and speeds This ::::: " cavity and then suddenly contracting the cavity, forcing the water to shoot out of an opening. A 6.50 daN squid (including the water in the cavity) that is at rest suddenly sees a dangerous ...
April 11, 2016

Science Help
I think I would pick D because you draw contour lines of constant elevation from point to point. The point is determined by your lat and long. If you do not know where you are, the elevation does not help much.
April 11, 2016

physics
mass balloon = .0027 kg buoyancy net up force = g [ 4 (1.29-.179) -.0027 ] = g (4.44) = 43.6 N using g = 9.81 m/s^2 F = k x 43.6 = 95 x x = .459 N
April 11, 2016

iron density?
need density of iron top scale has 2.33 - Viron*916 but Viron = 2.33/density of iron
April 11, 2016

math!!! help
if two roots are identical then (b-4)^2 - 4(2)(-4)(b+2) = 0 b^2 - 8 b + 16 = -32b - 64 b^2 + 24 b + 80 = 0 (b+4)(b+20) = 0
April 11, 2016

additional mathematic
Well, first draw a picture now from A or C go right 3 so x = 3 from B go down 4 or from A go up one so y = 3 so D(3,3)
April 11, 2016

Health
I told you that !!! B is through lungs, not skin The answer is D.
April 11, 2016

Health
That was not Ms Sue - no way. Respiration occurs through the lungs, not the skin. Perspiration occurs through the skin. That is why it sometimes is a bit smelly I suppose although I am sure it reacts with whatever contamination is already on our skin.
April 11, 2016

Algebra
[ 1 +/- 19]/10 use w = 2 then L = 9
April 11, 2016

Algebra
L = 5 w - 1 A = L w = (5w-1)w A = 5 w^2 - w = 18 of whatever sl is 5 w - 1 w - 18 = 0 w = [ 1 +/- sqrt(1+360) ]/10 = [
April 11, 2016

Math: Trigonometry
cos^2 (2x-pi) = .75 cos (2x-pi) = +/-.866 let z = 2x-pi if z = 30 degrees (pi/3) yes if z = 150 degrees (2pi/3) yes if z = -30 degrees(-pi/3) yes if z = -150 degrees(-2pi/3) if z = -pi/3 then 2 x-pi =-pi/3 2 x = 2 pi/3 x = pi/3 , well that is + if z = +pi/3 2 x = pi + pi/3 = 4...
April 10, 2016

Mathematics
1 yes horizontal means both y vaues the same. -3 is not -8 vertical means both x values the same. 6 is not 0
April 10, 2016

Physics
I guess it is at constant velocity m g = 3.1*9.81 = 30.4 N weight mu m g = 43.5 N mu = 43.5/30.4 = 1.43
April 10, 2016

PHYSICS!!
original a momentum = 80*2.5 original b momentum = -68*1.2 total momentum before and after = 80*.5 - 68*1.2 after = 80*1 + 68 Vb which is final momentum a = 80 final momentum b = total - 80 F on a = (final momentum a - initial momentum a) /0.1
April 10, 2016

English
yes
April 10, 2016

Interest
12,000 (1.056)^n
April 10, 2016

Math
You are welcome.
April 10, 2016

Math
(1/-9) /9 = -1/81
April 10, 2016

Science
http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/refr.html
April 10, 2016

Science
refraction occurs at a boundary where the speed of the wave changes. Google Snell's law
April 10, 2016

stats
cost = 500 + 200 + 200 = 900 revenue = 250 * 4 = 1000 obviously you can not raise 200 there are 1 + 2 + 4 = 7 winning tickets out of the 250 chance of winning 500 = 1/250 chance of winning 100 = 1/125 chance of winning 50 = 1/62.5 chance of winning anything at all = 7/250 ...
April 10, 2016

Physics CENTER OF MASS
http://www.jiskha.com/display.cgi?id=1460315436
April 10, 2016

I did this already
scroll down
April 10, 2016

HELP PHYSICS!! WORK
m g 8.3 sin 16 + friction force * 8.3 friction force = .6 (m g cos 16)
April 10, 2016

Math ratio
w/p = 3 or w in quarts = 3 * p in spoons 1 quart = 3* p in spoons for 1 qt so for 1 qt, p = 1/3 spoon for p = 1 spoon you get 3 quarts of water
April 10, 2016

Calculus
r^2 h = 21.66/pi = 6.89 now you still have to do the problem cost = cost of top and bottom + cost of side x is cost of side metal per in^2 C = 2x pi r^2 + x (2 pi r h) call c = C/2pix what we minimize c = r^2 + r h but we already know h = 6.89/r^2 c = r^2 + 6.89/r luckily you ...
April 10, 2016

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