Wednesday
September 3, 2014

Posts by Damon


Total # Posts: 18,248

geometry
2 2 3 3 3 1
August 16, 2014

Math
by "right" do you mean "right triangle" ? If so then tan B = b/a B = tan^-1 (b/a)
August 16, 2014

calculus
Hey, you are doing great ! These last two were harder than the ones you asked for help with.
August 16, 2014

calculus
good, that is a long one :) add, then multiply, then add
August 16, 2014

calculus
3 min = 180 seconds downstream = 5 * 180 across = 12 * 180 hypotenuse = sqrt (across^2 + downstream^2)
August 16, 2014

calculus
in the x direction 6 * 1 = 6 int the y direction 2 * -4 = -8 in the z direction 0 * 1 = 0 6 + -8 = -2 see: http://www.mathsisfun.com/algebra/vectors-dot-product.html to see how to do it with |A| * |B| * cos theta
August 16, 2014

Physic
hard to say without knowing the volume. duck it in a full cup and measure the amount of water that flows over the lip.
August 16, 2014

Physics 2
Hard to say without knowing the distances... In general F = k Q1 Q2 /|R^2| iin direction of R If horizontal length = a and vertical height = h Q is lower right Q1 is lower left Q2 is upper left Q3 is upper right R is vector from Q to one of the other 3 Rx = x component of R Ry...
August 16, 2014

Algebra
I am not sure your superscript shows up on everyone's screen. 5 (14-20)^2 /2 = 5 * 36 /2 = 5 * 18 = 90
August 16, 2014

physics, mit 2.01x, mechanical engineering
If you tried to copy and paste the drawing or sketch of this truss here, it did not work because copy and paste is not allowed here. From what you said, moment of inertia of the cross section must be increased or length of section reduced assuming you are doing Euler column ...
August 15, 2014

math
how many buggies? 21 = 9 + 3 n n = 4 4*4 = 16 21 - 16 = 5
August 14, 2014

Math
1+2+3 average is (1+3)/2 = 2 2*3 = 6 check :) so I think it is (1+31)/2 = 16 16*31 = 496
August 14, 2014

math
-2 = -1/.5 so they are perpendicular, yes, C
August 14, 2014

math corrections
profit, p = revenue, r - cost, c r = revenue = 25 g c = cost = 75 so p = 25 g - 75 so if p >/= 50 then 25 g - 75 >/= 50 so you are right. It is E.
August 14, 2014

math
4.85/4 = 1.21625 = quarterly percent 11 years = 44 quarters (1.0121625)^44 = 1.7022 3,500 * 1.7022 = 5957.70 so agree. I do not see any list of staetements
August 14, 2014

mathematics
x+6
August 14, 2014

math corrections
I agree with your answer, C and have no idea why it is called incorrect.
August 14, 2014

math corrections
1, 5c 2 10 c 3, 15 c 4, 25c 5 30C 6 35 c 7 40 c 8 50 c 9 55 c 10 60 c 11 65 12 75 c 13 80 c 14 85 c 15 90 c
August 14, 2014

math
4000/7 = 571.4 so we need a little more than 571 572 will do 572 * 7 = 4004, check :)
August 14, 2014

math
5 28 = 300 + 28 = 328 6 43 = 360 + 43 = 403 sum = 731, agree
August 14, 2014

Finance
If your in county prices go up so you must pay more of your coins for a banana, then your coins will buy fewer of my bananas and is worth fewer of my coins which can still buy as many bananas as they did last year.
August 14, 2014

fundinjobo high science
H2 is 2 grams/mol so we have 40 mols of H2 which is 80 mols of H for each mol of H we get 1/3 mol of NH3 so we get 80/3 mols of NH3 NH3 is 14+3 = 17 grams/mol (80/3)mols * 17 grams/mol = 453 grams NH3
August 14, 2014

math
y = 14 t - 4.9 t^2 if you do not know physics or calculus you must complete the square to find the vertex of the parabola. 4.9 t^2 - 14 t = -y t^2 - 2.857 t = -(1/4.9) y t^2 - 2.857 t + 1.429^2 = -(1/4.9)y+2.04 (t-1.429)^2 = -(1/4.9)[ y - 10 ] vertex at height 10 meters and ...
August 14, 2014

history
http://history.howstuffworks.com/revolutionary-war/hartford-convention.htm B. mainly ports for international trade. (Boston, Philadelphia, New York, Charleston, the ports in Va and MD ....... Hey, Google this stuff !
August 14, 2014

history
....... from Albany to ______ Oh well :(
August 14, 2014

math
What are you talking about? 15,000 (1 + 0.10/12)^12n for 6 years 15,000(1.008333)^72 = 15,000*1.8176 = $ 27,263.91 for 12 years 15,000 (1.008333)^144 = $49,554.73 etc
August 14, 2014

math
4 s = 20 s = 5
August 14, 2014

maths probably typo but all right here is your cost
I suspect you men .10 or 1.0 times 8 per mile not $10 per (1/8) mile but since you used 10 I will go along with $80 per mile c = 1.8 + 80 m c(4.5) = 1.8 + 80 (4.5)
August 14, 2014

Maths
.75 fruits = orange or .75 f = oj .25 fruits = apples or .25 f = a oj - 10 = .5 a so .75 f - 10 = .125 f .625 f = 10 f = 16 answer now check 12 + 4 = 16 yes 12 - 10 = 2 2 = half of 4 yes
August 14, 2014

maths parentheses? might as well be Martian
I can not decipher your text right off for example (36/25)^(3/2) or [36/(25)^3]/2 or what, no hope unless you use parentheses properly
August 14, 2014

Math
if y = a x^n then dy/dx = a n x^(n-1) so if y = 2400 x^1 - 2 x^2 then dy/dx = 2400 (1) x^(1-1) - 2 (2) x(2-1) or dy/dx = 2400 x^0 - 4 x^1 which is dy/dx = 2400 - 4 x
August 14, 2014

math
try volume Vnew = (x+2)(x+2)(x+2) big mess try area Anew = (x+2)(x+2) = x^2 + 4 x + 4 not this for sure try that perimeter thing how many edges? 4bottom +4top +4verticals = 12 edges 12 * 2 = 24 !!! winner
August 14, 2014

maths
suspect you mean 0.10 per 1/8 mile or 0.80 per mile c(n) = 1.80 + .8 n c(4.5) = 1.80 + .8 (4.5)
August 14, 2014

maths
I told you.
August 14, 2014

maths
surface area = area of base and top (same for both) + height*2 pi r so not the same and not twice volume = area of base * height ah ha, twice if you double height
August 14, 2014

Statistics
combinations of 15 taken six at a time 15!/ [6! (15-6)!] 15! /(9! 6!) 15*14*13*12*11*10 / (6*5*4*3*2) 7*13*11*5
August 14, 2014

maths
2.25 times volume = area of base * height height the same base 1.5*1.5 = 2.25
August 14, 2014

Physics
change in potential energy = m g h = work done = 2180 Joules/second * t
August 14, 2014

Physics
r omega^2 = 9.81 m/s^2 r = (6.9/2)*1000 = 3450 m so omega^2 = 9.81/3450 omega = .0533 radians/s (that is about 118 seconds /revolution or about 2 minutes per revolution)
August 14, 2014

Physics
force * time = change in momentum = m v
August 14, 2014

physics
x displacement = 50 cos 90 + 50 cos 245 = 0 -21.43 y displacement = 50 sin 90 + 50 sin 245 = 50 -45.3 = 4.68 displacement = sqrt (-21.4^2+ +4.68^2) = 21.9 meters x is negative and y is positive so quadrant 2 tan angle above x axis = tan^-1 y/-x = tan^-1 4.68/21.43 = 12.3 deg ...
August 13, 2014

math
25 + 12*15 = 205 .12 * 205 = 24.60 saved
August 13, 2014

Algebra
either way. (a*b)/c = (b/c)a = a b / c
August 13, 2014

algebra
Please, please, try to use standard notation Do you mean (3-s)^(1/3) = 3 ??????? if so raise both sides of the equation to the third power (3 - s)^1 = 3-s = 27 s = 3 - 27 s = -24
August 13, 2014

mathematics (word problems)
.5 x + .25 x = monitor + modem .25 x remains so .25 x = 200 + 150
August 13, 2014

whoops
(m-1/4)(.8) = 3 - 1.2
August 13, 2014

math
0.10 per 1/8 mile = 0.8 per mile miles = m (m - 1/4 ).10 = 3.00 - 1.20
August 13, 2014

math
volume of box = 4*3*2 = 24 ft^3 volume of brick = 8/12 *4/12 * 2/12 = 2/3 * 1/3 *1/6 = 1/3 * 1/3 *1/3 = 1/27 ft^3 24/ (1/27) = 648
August 13, 2014

Math
You try first.
August 13, 2014

math
17 * 10^-6 mm .0 0 0 0 1 7 move that dot 6 places right and you get 17
August 13, 2014

English
http://www.sparknotes.com/lit/flies/section12.rhtml
August 13, 2014

Geometry: Area and Volume Math
I mean volume of sphere :)
August 13, 2014

Geometry: Area and Volume Math
length in cm or meters or feet or elbows or thumbs area in cm^2 or m^2 or ft^2 or elbows^2 or thumbs^2 volume in cm^3 or m^3 or ft^3 or elbows^3 or thumbs^3 areas = multiple of two lengths volumes = multiples of three lengths of course those lengths might be the same for ...
August 13, 2014

Geometry: Area and Volume Math
length * width * height 6 * 6 * 6 = 6^3 = 216
August 13, 2014

math
sin Angle = 10/20 = .5 as we all know sin 30 degrees = .5
August 12, 2014

help AGAIN
Hopefully curiosity leads to an explanation. Hopefully sincerity leads to trustworthiness.
August 12, 2014

physics
time for phase 1 = 7/9.5 = .737 hr time for entire trip = 23/22 = 1.045 hr time for 16 km = 1.045 - .737 = .308 hr speed for 16 km = 16/.308 = 52 km/hr
August 12, 2014

chemistry
P V = n R T V = n (R T/V0 so volume is proportional to number of mos if P and T are constant we need three mols of H2 for every mol of N2 so there is exactly the right amount of each for every mol of N2 we will get 2 mol of NH3 so for every mL of N2 we will get 2 mL of NH3 so ...
August 12, 2014

algebra
ok, I will try but very confusing -5 (assume x here means times, not x) -5[1/(3x+4)]^(1/3) = -10 ??????? or [1/(3x+4)]^(1/3) = 2 1/(3x+4) = 8 8(3x+4) = 1 24 x + 32 = 1 24 x = -31 x = -31/24 or do you mean -5 [(1/3)x +4 ]^(1/3) = -10 or [(1/3)x +4 ]^(1/3) = 2 ?????? (1/3) x + 4...
August 12, 2014

algebra
You notation is very hard to follow. Do you mean [ 1/(2n+3) ]^(1/4) = 3 ??? if so 1/(2n+3) = 81 81 (2n + 3) = 1 162 n + 243 = 1 162 n = -242 n = - 1.49
August 12, 2014

Math
This question could have been written another way around. Lets see how many friends Adrienne is can spend 5 dollars on in addition to spending 75 on the rental for amount in her budget c f = (c - 75)/5 NOW f depends on c but the equation is really the same 5 f = c - 75 or 75+...
August 12, 2014

Math
c = 75 + 5 f cost c depends on number of friends f
August 12, 2014

Math
ROTFL anything to the zero power is ONE one to one hundred or whatever is ONE 3^27 * 3^-9 = 3^18
August 12, 2014

math PLEASE HELP
You are welcome :) by the way 366/7 = 52 remainder 2 days Sunday - Monday is one Monday - Tuesday is two so we land there on Tuesday
August 12, 2014

math PLEASE HELP
LOL 2012 was a leap year beginning on Sunday http://www.calendarlabs.com/online-calendar.php?y=2012 Tuesday
August 12, 2014

physics
I have no idea what the statement is but in general if you drop something with no initial speed v = sqrt (2 g h) where h is height in meters g = 9.81 m/s^2 on earth v is in meters/second If you used copy and paste, it does not work here and I can not see your problem.
August 12, 2014

MATH
.5 x for film , .5 x left .25 * .5 x = .125 x on refreshments so .5 x - .125 x = .375 left for the book so .375 x = 7.50 x = 20 dollars
August 12, 2014

PLEASE HELP WITH MATH
You are welcome.
August 12, 2014

PLEASE HELP WITH MATH
If the clock spun backwards, then 20 minutes before any hour the minute hand would point to 4 assuming that the numbers remained painted on the dial as they are now.
August 12, 2014

algebra
Do you mean (1/3) + 5/(s-4) = 2 ???? if so then multiply everything by 3(s-4) (s-4) + 15 = 6(s-4) 15 = 5 (s-4) 3 = s-4 s = 9 Yes, I agree all the way.
August 12, 2014

algebra
k + 5 = -6/k k^2 + 5 k = -6 k^2 + 5 k + 6 = 0 NOTE - we have a sign problem (k+2)(k+3) = 0 k = -2 or k = -3
August 12, 2014

algebra
suspect you mean (2x+3)/x = (x+5)/2 multiply everything by 2x 4 x + 6 = x^2 + 5x x^2 + x - 6 = 0 (x-2)(x+3) = 0 x = 2 or x=-3 note I have a problem with your transition from your line two to line three 2(2x+3)=x(x+5) 4x +6=x^+5 should be 4 x + 6 = x^2 + 5x
August 12, 2014

geometry
1 m / 2 cm 14 cm (1 m / 2 cm) = 7 m 20 (1/2) = 10 m 7 (1/2) = 3.5 m
August 12, 2014

Math
14 = 7*2 always :) (x-7)(x+2) ------------------ b(Ab+3) ----------------- suspect you mean a^3-8a^2+15a which is a (a^2-8a+15) but we know 15 = 3 * 5 and 3+5=8 :) so a (a-5)(a-3)
August 12, 2014

math
circles are all geometrically similar to each other so all lengths scale the same. Both the diameter and the circumference are lengths. (1/2) 8 = 4
August 12, 2014

arithematic
1000 = (v+c)15 = 15 v + 15 c 1000 = (v-c)30 = 30 v - 30 c ------------------------------- 2000 = 30 v + 30 c 1000 = 30 v - 30 c ------------------ subtract 1000 = 60 c etc
August 12, 2014

Algebra
5 + 4 (2)^2 = 5 + 4 (4) = 5 + 16 = 21
August 12, 2014

Algebra
(4 * 1/10)^3 = 64 * 1/1000 = .064
August 12, 2014

Algebra
2*2*5 x^5 u^7 and 2*2*7 x^3 v^2 u^4 4 x^3 u^4
August 11, 2014

Analytic Geometry
sketch it first then find the lengths of the sides for example c^2 = 2^2 + 6^2 = 40 c = 2 sqrt 10 then use law of cosines a^2 = b^2 + c^2 - 2 b c cos A
August 11, 2014

Analytic Geometry
intersections: x^2 + y^2 - 2x - 2y -2 = 0 x^2 + y^2 + 2x + 2y -2 = 0 ---------------------------subtract -4x -4y = 0 x = - y so along that line of slope -1 now where does x = -y on either circle? 2 y^2 + 2y -2y = 2 y^2 = 1 y = +/- 1 x = -/+ 1 in other words at (-1,1) and (1,-1...
August 11, 2014

Analytic Geometry
I think you mean "VERTICES" or "corners" in geometry where two straight lines meet.
August 11, 2014

math
5^3 - 2^3
August 11, 2014

math
so this time they add to 90
August 11, 2014

math
supplementary angles add to 180 93 + x = 180 or x = 180 - 93
August 11, 2014

physics
250 (1000/3600) = 69.4 m/s v = Vi + a t 0 = 69.4 -10t t = 6.94 seconds to stop d = (1/2) a t^2 = (1/2)(10)(6.94^2) = 241 meters
August 11, 2014

statistics gibberish
Please proof read does body mean boys? what is 60 kg ? who got hired for what? http://davidmlane.com/hyperstat/z_table.html
August 11, 2014

Algebra
2 v^2 + 4 v - 14 = v^2 + 2 v + 1 v^2 + 2 v - 15 = 0 (v+5)(v-3) = 0 v = 3 or -5 the next one is easy
August 11, 2014

Algebra
L = 7 + 2 w L w = 99 (7+2w)w = 99 2 w^2 + 7 w - 99 = 0 (2w -11)(w+9) = 0 w = 11/2 L = 7 + 11 = 18
August 11, 2014

chemistry
By the way molecules of He is the same as atoms of He because there is one atom per molecule. If it had been H2 or O2 there would have been twice as many mols of atoms as mols of molecules.
August 11, 2014

chemistry
3 times Avagadro's number = 3 * 6.022 * 10^23 = lots of them Hey saying you have a mol of something is the same as saying you have 6*10^23 of them. It is sort of like if you say you have a dozen everyone knows you have twelve.
August 11, 2014

Calculus-Math
dC/dt = dC/dx dx/dt = 60 dx/dt = 60 [ 3(-1.637) t^2 etc
August 11, 2014

Algebra
2*3*5* w^4 * v^8 and 2*2*2*3 * y^3 * w^6 *v^2 2*3* w^4 *v^2 or 6 w^4 v^2 is all that is common
August 11, 2014

Algebra
I just did this about one minute ago. Stop spamming.
August 11, 2014

Geometry
NO lots of things with 4 straight sides are not rectangles but squares are.
August 11, 2014

Algebra
You are welcome.
August 11, 2014

Algebra
w (9-w^2) second factor is difference of squares in general a^2-b^2 = (a-b)(a+b) so w (3-w)(3+w) or -w (w-3)(w+3)
August 11, 2014

physics
Ah, ha, there was more. initial south momentum = 900 v initial west momentum = 2000 u final south momentum = 2900(16)cos 24 final west momentum = 2900(16)sin 24 so 900 v = 46400 (.9135) and 2000 u = 46400 (.4067)
August 11, 2014

algerbra
draw a number line from way left to way right +54 - (-17) = 54+17
August 11, 2014

Maths literacy
base times height. It is the same as a rectangle with a triangle taken off one end and tacked to the other end. Draw it.
August 11, 2014

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