Tuesday
January 17, 2017

Posts by Damon

Total # Posts: 28,779

Algebra 1
You are welcome.
January 7, 2017

Algebra 1
a = b + 2 c b = 2 c so a = 2 c + 2c = 4 c a + b + c = 77 4 c + 2 c + c = 77 7 c = 77 c = 11
January 7, 2017

math
you could do this by dividing the areas but that is not safe because it might not be exact one way or the other so 6 * 1.5 = 9 8 * 1.5 = 12 6*8 = 48 exactly
January 7, 2017

Math
4b+2p = 34 p = b-4 4 b + 2(b-4) = 34 4 b + 2 b - 8 = 34 6 b = 42 b = 7
January 7, 2017

algebra
3 z^2 = -108 z^2 = -36 z = +/-6 sqrt -1 = +/- 6i
January 7, 2017

algebra
5 x^2 = 651-536 = 115 x^2 = 23 x = +/- sqrt 23 = +/- 4.80
January 7, 2017

Math
49 - 2v
January 7, 2017

Math
three choices for the first digit 2 choices for the second 1 choice for the third 3*2*1 = 6 1 2 3 1 3 2 2 1 3 2 3 1 3 1 2 3 2 1
January 7, 2017

algebra
54 = 2*27 = 2*3*3*3 6 and 9 is 15 so (w-6)(w-9)
January 7, 2017

Calculus
5[xdy + ydx ] +x^2 dy+y(2x dx)=0 dy(5x +x^2) + dx(5y+2xy) = 0 dy/dx = =(5y+2xy)/(x^2+5x)
January 6, 2017

Chemistry
Ph determination
January 6, 2017

Chem 111
1000 kg/m^3 V = pi (d^2/4)h d = 6 ft = 1.83 m h = 17.5 ft = 5.33 m so V = [pi(1.83^2)/4 ]5.33 m^3 mass= 1000 * V in kg there are about 2.2 pounds/kg
January 6, 2017

Math
(2*27 + n)/3 = 29 54 + n = 87 n = 33
January 6, 2017

Need help with vector questions posted below
+1 1 3 -1 2 n +2 m 1 determinant = 0 2 + 2n -3m -12 -nm +1 = 0 2n-9 -m(3+n) = 0 m = (2n-9)/(3+n)
January 6, 2017

maths
everything in thousands two points on line (4,22) and (6,30) (30-22)/(6-4) = slope so slope = m = 4 c = 4 n + b 22 = 16 + b b = 6 so c = 4 n + 6 if n = 4.5 c = 4(4.5) + 6 c = 18+6 c = 24 so 24,000
January 6, 2017

Vectors - Maths [Second Question]
+1 -1 +2 +1 +2 -4 +m +6 -12 det = 0 -24 +12 +4m -4m +24 -12 = 0 I get any old m
January 5, 2017

Vectors - Maths
+1 1 3 -1 2 n +2 m 1 determinant = 0 2 + 2n -3m -12 -nm +1 = 0 2n-9 -m(3+n) = 0 m = (2n-9)/(3+n)
January 5, 2017

calculus
f(x+h) = 1/(2x+2h) f(x) = 1/2x f(x+h)-f(x) = (2x -2x-2h)/2x(2x+2h) = -2h/(4x^2+4xh) divide by h = -2/(4x^2+ 4xh) let h--->0 = -2/4x^2 = -1/2x^2
January 5, 2017

Calculus
Oh well h = 9 cm r = (6/12)9 = 4.5 cm dV = pi r^2 dh so dV/dt = pi r^2 dh/dt -3 cm^3/min = pi (4.5)^2 dh/dt so dh/dt = -3/[ pi(4.5)^2] about .047 cm/min
January 5, 2017

Calculus
No. The answer is in cm/min not cm^4/min. I did not check the arithmetic.
January 5, 2017

Calculus
I and also Steve have answered a million of these. For example: http://www.jiskha.com/display.cgi?id=1415757944
January 5, 2017

incomplete
earned how much in a year, call it x percent = 100 (x/9000)
January 5, 2017

Maths
By the way for small angles most of us assume sin theta = tan theta = angle in radians where angle in radians = angle in degrees * pi/180 then the arc length = chord length = R theta
January 5, 2017

Maths
LOL, If you really want to do it as an isoceles triangle with equal legs of length 5.06 e13 miles then sin .5 minutes = (x/2)/5.06e13 x = 5.06 e13 * 2 sin .5 min sin .5 min = sin (.5/60) degrees = .000145441 times 10.12 e13 = .00147186292 e13 = 1.47 e10 again:)
January 5, 2017

my typo
found error so your arc length in light years is 2 pi(8.611)/(60*360) = .0025048 light years which is 1.47e10 miles (those are land, not nautical miles) To get it go to Google and type .0025048 light years = miles and hit enter or use calculator and speed of light.
January 5, 2017

Maths
Clearly parallax is not a problem at this distance :)
January 5, 2017

Maths
You are right, I have an arithmetic error I estimate that 8.6 light years ia about 5.06 * 10^13 or 5.06e13 miles one minute is 1/21,600 of the circumference [ that is 1/(360*60) because 360 degree and 60 minutes per degree] circumference = 2 pi r = 2 pi * 5.06e13 = about 31 ...
January 5, 2017

Maths
for that pesky e notation: http://www.mathsisfun.com/numbers/scientific-notation.html look at example at the end: Example: 3.12E4 is the same as 3.12 × 104 3.12E4 = 3.12 × 10 × 10 × 10 × 10 = 31,200
January 5, 2017

Maths
Oh my, you really need another bit of spherical trig, namely the measure of an angle in "radians" there are 2 pi radians in a circle of 360 degrees so the circumference is C = 2 pi radians * R the handy thing is for any angle in radians now arc length along circle = ...
January 5, 2017

Maths
2*1.5 = 3 m^2
January 5, 2017

physics (mechanics)
dU = work done=potential change or force dr = dU U = A/r dU/dr = F = -A/r^2 Sign of A depends on attractive or repulsive.
January 5, 2017

Pre Calc
These are straight lines, they cross once. 2.4 +.3 t = 1.1 + .7 t .4 t = 1.3 t = 13/4 = 3 1/4 years
January 4, 2017

Math
pre tax = 1.18 p 1.18 p * 1.06 = 37.20 so p = 37.20 / (1.18*1.06)
January 4, 2017

math - calculus help!
oh well, not that hard V = (1/3)pi r^2 h r = 7 h/24 so V = (1/3)pi (7/24)^2 h^3 dV/dh = pi (7/24)^2 h^2 dh when h = 10 dV = pi (70/24)^2 dh dV = pi (35/12)^2 dh
January 4, 2017

math - calculus help!
You could use a fancy formula for volume of a cone and differentiate it to find dV/dh but if you just draw a picture you can see that the area of the surface * dh is the added volume for added dh
January 4, 2017

math - calculus help!
radius/depth = 7/24 what is radius when depth = 10? 7/24 = r/10 r = 70/24 = 35/12 now the change of volume with depth h is the surface area area * dh = dV pi r^2 dh = dV pi r^2 dh/dt = dV/dt = 12 ft^3/m pi (35/12)^2 dh/dt = 12 dh/dt = .449 ft/min
January 4, 2017

Pre calc
Good, you have two different ways now :)
January 4, 2017

Pre calc
slope = (20-13)/(4-3) = 7 also for any (x,y) slope = (y-20)/(x-4) so 7 = (y-20)/(x-4) 7 x - 28 = y - 20 so y = 7 x -8
January 4, 2017

THANK YOU DAMON
You are welcome :)
January 4, 2017

Social Studies
a.They conquered inland kingdoms, which they turned into a trading empire. --------------- The big advantage the Portuguese had over Arabs etc in the Indian Ocean was big ships with big guns. They did not try to march inland. India was a civilized country with real armies, not...
January 4, 2017

Social Studies
Yes, maybe b then c
January 4, 2017

Social Studies
It was particularly the various competing Christian missionaries that made the Japanese mad, and they were very angry about what happened in the Phillippines. The Dutch were allowed to hang out in a Nagasaki trading post because they did not try to convert people or push them ...
January 4, 2017

Social Studies
Particularly this excerpt: "Japan had been closed to the outside world for 250 years. When foreign people entered Japanese waters, even if they were shipwrecked by accident, they were interned in jails and some of them were killed (Lubor 33). The reasons for the Japanese ...
January 4, 2017

Social Studies
Ah yes, this is short and sweet http://willamette.edu/~rloftus/perry.html
January 4, 2017

Social Studies
I am looking for a link for question 2
January 4, 2017

Social Studies
no, no
January 4, 2017

Social Studies
Now for question 2, perhaps we better look at the start of American-Japanese relations. Did you read about only the Dutch being allowed there before that fleet arrived?
January 4, 2017

Social Studies
here is a wiki for Goa: http://www.google.com/search?q=goa+india&ie=utf-8&oe=utf-8
January 4, 2017

Social Studies
Well, I suppose I could give you some link to a wiki or something, but first think about it. The Portuguese ended it all in India long this after with Goa. Can you imagine a little country like Portugal marching around India ? They were sea farers
January 4, 2017

Social Studies
In question 1, remember we are talking about the Portuguese, not some tea company.
January 4, 2017

Social Studies
Ah, what do you think? The answer to question 2 is petty dramatic and amazing.
January 4, 2017

Pre calc
y = m x + b y = -(3/2) x +3/4 or 4 y = -6 x + 3
January 4, 2017

History
Well, my choices would be: 1. Prince Henry the Navigator, Bartolomeu Dias, Vasco da Gama .... so D 2.I would say B 3. See question 1.
January 4, 2017

Math
65*50 = 6500/2 = 3250 ft^2 so 1625/3250 $/ft^2
January 4, 2017

American Government
County responsibility is now chiefly law enforcement (sheriff and county jail) and registry of deeds and such. However it still exists and the towns and cities have not take over all county responsibilities.
January 4, 2017

American Government
Although our ounty government has been largely eliminated over the last decade, we still have a sheriff etc. Our town governments operate much like our city governments, although often having a Board of Selectmen instead of a City Council. Both towns and cities are often run ...
January 4, 2017

American Government
http://en.wikipedia.org/wiki/Essex_County,_Massachusetts
January 4, 2017

Physics
I think it is a dip and v^2/R = 0.15*9.81
December 30, 2016

Physics
density = 1000 kg/m^3 is easier :) You do not say if you want gage pressure or absolute pressure I will assume gage rho g h = 1000*10*25 =2.5 *10^5 Pascals or N/m^2 if you want absolute pressure add one atmophere or about 1*10^5 for a total of 3.5*10^5 Pascals
December 30, 2016

Physics
You already said the speed of the boat through the water was 2 m/s The speed over the land is 2-.8 = 1.2 m/s
December 30, 2016

physics
v^2/R = g or it loses contact m g(h-D) = .5 mv^2 v^2 = g R = .5 g D so m g(h-D) = .5 m *.5 g D =.25 mgD h-D = .25 D h = 1.25 D
December 30, 2016

Math
anything^0 = 1 so x^3/x^3 = x^0 = 1 y^6/y^6 = y^0 = 1 so 1
December 29, 2016

asthmatics
assuming it is the height that is 9.5 outside volume = 23 * 15.5 * 11 inside volume = 20 * 12.5 *9.5 now subtract the inside from the outside
December 29, 2016

maths
Thank you rabin for entertaining the math tutors :)
December 29, 2016

Chemistry
(750-726)/(20-10) = 2.4 (800-750)/(40-20) = 2.5 (880-800)/(70-40) = 2.7 (960-880)/(100-70)= 2.7 slope increasing a bit but 2.7 seems a reasonable guess slope = (x-960)/(150-100) (x-960)= 50(2.7) x = 960 + 135 = 1095
December 28, 2016

calculus
http://www.mathsisfun.com/calculus/differential-equations-homogeneous.html LOOK at the example at the end :)
December 28, 2016

Physics
This might help: http://www.slideshare.net/ahmedqadoury/periodic-and-aperiodic-sounds-2
December 28, 2016

Physics
I am sorry I can not because if you do a Fourier transform on even a spike you can express even an impulse as a sum of periodic signals. However there are articles on non-periodic vibrations in the technical literature. I question if they are really that but anyway take a look...
December 28, 2016

math, algebra
120 + 7 x = 11 x so 4 x = 120 x = 30
December 28, 2016

Matt
2.54 cm/in L in cm = L in inches (2.54 cm/in) so 2.54 times as many centimeters as inchess
December 28, 2016

Science
MASS IS CONSERVED! Until you get to Einstein and Special relativity, the total mass is CONSTANT. .015 + .050 = .065 kg
December 28, 2016

Math
time = t vf t = 260 vp t = 320 so 260/vf = 320/(vf+15) 320 vf = 260 vf +260(15) 60 vf = 390 3 vf = 39 vf = 13 km/hour
December 28, 2016

SAT Math Question?
L --- 1/3 job/hr S ---1/5 job/hr together 1/3 + 1/5 = 8/15 job/hr (8/15 j/h)(1 h) = 8/15 job done that leaves (15-8)/15 = 7/15 to do (1/5)job/hr * t = 7/15 job t = 35/15 hr for S to finish 35/15 hr * 60 min/hr = 140 min
December 28, 2016

algebra
3j(j^2-17j +70) =3j (j-10)(j-7)
December 26, 2016

algebra
9 r^2 - 30 r + 25 = 0 (3 r -5)(3r-5) = 0 r = 5/3 and 5/3 repeated, parabola just touches r axis
December 26, 2016

algebra
2(2a^2-5a+3) is 2(2a-3)(a-1)
December 26, 2016

algebra
64 z^2 - 1 That is the difference of two squares remember a^2-b^2 = (a-b)(a+b) so (8z-1)(8z+1)
December 26, 2016

nobody knows
Did you try to copy and paste? That does not work.
December 26, 2016

physics
Assuming that they are in series, 1.2 amps goes through each so current density = 1.2 /(pi d^2/4) for each
December 26, 2016

calculus too hard
Use Steve's solution if no typos in problem statement.
December 26, 2016

calculus too hard
I am still not sure it is right maybe dx/dt = k(a-t) ?? if so try x = c + p t - kt^2/2 then dx/dt = p -kt then p = ka and if c = 0 then dx/dt = 0 +ka -kt = k(a-t) so then x = ka t - k t^2/2
December 26, 2016

typos?
I think you might mean dx/dt = k(a-x) but what is c?
December 26, 2016

Maths
tan 60 = X1/1 tan 30 = X2/1 d = X2 - X1 v = d/t t in hours = 10 s /(3600 s/hour)
December 25, 2016

math
angles OBA and OCA are right angle BOC is 90-40 = 50 ABC =180 - 20 - 90 = 70 = ACB
December 25, 2016

Maths
1.12 p = 15,000
December 25, 2016

Calculus 3
No, because multiply by sqrt 14 which is |n|
December 25, 2016

Calculus 3
n = 3 i +2 j + k we want F dot n = |F| |n| cos angle but we are given that |F| cos angle is 3 z/sqrt14 so what is |n|? sqrt (9+4+1) = sqrt 14 ha, that helps :) so F dot n = 3 z so do the integral of 3 z over the surface
December 25, 2016

Calculus 3
http://tutorial.math.lamar.edu/Classes/CalcIII/SurfIntVectorField.aspx boundary in first quadrant means x from 0 to 2 and y from 0 to 3 (sketch that thing)
December 25, 2016

math
89/18 =4 + something 4 * 18 = 72 89 -72 = 17 left over
December 25, 2016

Physics
well, sure the tension does work, but the idea is that you do not have to get into the innards of this system because its kinetic energy is described by the (1/2)(m1+m1)v^2 and (1/2) I omega^2 and its potential energy by the m g h of the two objects. You could solve the whole ...
December 24, 2016

sorry, read -1 not -3
-3(-2) = +6
December 24, 2016

MATH
y = -1 x +42 slope = -1 = change in y/change in x if change in x - -1 then change in y /-2 = -1 so change in y = -1 (-2) = +2
December 24, 2016

Physics
max ke = max Pe = m g h h = r (1-cos 60) = r/2 so max (1/2) m v^2 = m g r/2 max v^2 = g r T = m g + m v^2/r T = m (g + g) = 2 m g = 2(.05)(10) T = 1 Newton
December 24, 2016

physics
4 *10 = 40*v v = 1
December 24, 2016

Physics
q = c v same q on each v1+v2 = 100 q/c1 +q/c2 = 100 q/4 + q/2 = 100 3 q/4 = 100 q =400/3 on each now same v on each and total charge=800/3 and total c = 6 v = q/c = 800/18 = 44.4 volts
December 24, 2016

algebra
let's see we need 5*5-1 in the middle something of form (5c ) ( 5) (5c-1) (c +5)NO that gives +24, we want - (5c+1)(c-5) = 5c^2 -24c -5 progress so (5c+d)(c-5d) = 5c^2 -24cd -5d^2 done
December 23, 2016

physics
Ac = g there = v^2/R = omega^2 R omega = 2 pi radians/24 hours =2 pi radians /(24*3600)seconds R is given so find omega^2 R
December 23, 2016

Specialist Mathematics
|x+y| two possibilities A: x+y B: -x-y = -(x+y) if A: x+y is maximum when both are + then x+y = |x|+|y| if B: -(x+y) has same absolute value as A etc
December 22, 2016

History -
I think I might have picked C because some of them are in South America and Asia and the Middle East.
December 22, 2016

Linear Relations MATHS
You are welcome
December 22, 2016

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