Friday
July 1, 2016

Posts by Damon

Total # Posts: 26,400

where is your attempt?
My job is not to just do it for you but to help if you get stuck.
May 8, 2016

Calculus
x^2(3y^2dy) + 2x dx(y^3) - 2ydy +xdy + dx y = 0 dy (3x^2y^2-2y +x) +dx(2xy^3+y)=0 dy (3-2+1) + dx (2+1) = 0 2 dy = -3dx m = slope = dy/dx = -3/2 so y = -3/2 x + b 1 = -3/2 + b b = 5/2 so y = -3/2 x + 5/2 or 2 y = -3 x + 5
May 8, 2016

English
Post means after.
May 8, 2016

English
disagree with #7 answer disagree with #11, ante means "before"
May 8, 2016

science
http://sciencelearn.org.nz/Contexts/Light-and-Sight/Teaching-and-Learning-Approaches/Investigating-refraction-and-spearfishing
May 8, 2016

science
Google Snell's law. They always show that particular picture :) Perhaps google spear fishing as well in the second question, something with the same color and index of refraction does not bend or reflect or anything and is invisible.
May 8, 2016

calculus
if Q = 100 = 10^2 r = (1/3)10^-3*10^6 or (1/3)(10^3) + (1/2)10^-2*10^4 or (1/2)(10^2) + 10^1*10^2 = 10^3 + 10^2 = about 333+ 50 + 1000 + 100 or about 1483 I get
May 8, 2016

calculus
Oh my Have you done integration of polynomials? integral x^n dx = 1/(n+1)x^(n+1) so integral x^2 dx = (1/3)x^3
May 8, 2016

just integrate
r = (1/3)(.001)Q^3 + (1/2)(.01)Q^2 + 10 Q + 100
May 8, 2016

B
dx/dt = 500 dc/dx = 0 + 2 x dc/dt = dc/dx * dx/dt = 2 x * 500 so at x = 6000 dc/dt = 12,000 * 500
May 8, 2016

calculus
1 ∫ (1+3x)^.5 dx 0 let z = (1+3x) dz = 3 dx so dx = (1/3)dz if x = 0, z = 1 if x = 1, z = 4 so 4 ∫ (z)^.5 dz/3 1 is (1/4.5) z^1.5 at z = 4 - at z = 1
May 8, 2016

calculus
well, one way: let z = 3 + 2x then dz = 2 dx so dx = (1/2)dz if x = 0, z = 3 if x = 2, z = 7 so 7 ∫ (5/z)(1/2) dz 3
May 8, 2016

math
o cups orange g cups ginger f cups filler o + g + f = 400 120 </= o </= 400 0 </= g </= 80 f </= 280
May 8, 2016

math
58 = 8 x + 9 (7-x) 58 = 8 x - 9 x + 63 x = 5
May 8, 2016

math - hummm
That depends :( If you do not put the grape back, you only have 31 in the machine when you draw the mango. You assumed the two events were independent. They may not be. I would have said: 10/32 * 16/31 not 32
May 8, 2016

science
H2SO4 ???? 4*6*10^23 O atoms per mol so 8 * 6 * 10^23 in two mol = 48*10^23 = 4.8 * 10^24 quite a few
May 8, 2016

science
Huh ? do you mean The measured density of He at STP is 0.1784g/l.what is the weight of one mole? If so then 1 mole = 22.4 liters at STP 22.4 * .1784 = answer
May 8, 2016

science
a mol of O2 has mass of about 32 g/mol so 32 g/mol * 1 liter/1.429 g = (32/1.429) liters/mol I hope it is about 22.4 liters :)
May 8, 2016

physics
ah --- if the altitude of the kicking foot and the goalie hands is the same, then the kinetic energy is the same. same (1/2) m v^2 so same 16 m/s (ignoring air friction)
May 8, 2016

math
yes, true
May 8, 2016

Math
7-2 = 5 so (5/7)x = 14 x = 14 * 7/5 total amount he had so cost = (2/7)(14 * 7/5) = 28/5 = $5.60 ==============check 14*7/5 - 28/5 = 10(7/5) = 14 yes
May 8, 2016

physics
How long to fall 54 meters with no initial vertical velocity? h = (1/2) g t^2 54 = 4.9 t^2 t = sqrt (54/4.9) then 130 = u t so u = 130/t
May 8, 2016

science
west =(1/3)hour*80 + (1/10)hr* 30 * cos 45 north = (1/10)*30 * sin 45 distance = sqrt(north^2+west^2) displacement = distance at angle T north of west where tan T = north/west speed = distance/ (1/3+1/10) velocity = speed at angle T
May 7, 2016

calculus help
You better use wolfram. That is a serious mess. http://www.wolframalpha.com/input/?i=integrate+dx%2F%283x^3-5%29^3+ type in integrate dx/(3x^3-5)^3 and click on the equal sign.
May 7, 2016

Science
distance d from home to college total distance = 2 d time to college = d/20 time to get back = d/40 total time driving = d/20 + d/40 average speed = 2d/(d/20+d/40) = 80/(2+1) = 80/3 = about 27 km/h
May 7, 2016

Math
pi (3.5)^2 (40) = 28 * 22 * h
May 7, 2016

physics
F = m a
May 7, 2016

Math
x = (3 y + 1) 4(3y+1) + 5 y = 4 12 y + 4 + 5 y = 4 17 y = 0 y = 0 x = 3*0 + 1 = 1 (1,0)
May 6, 2016

Math
m multiple pointers s short responders m + s = 20 3 m + 8 s = 100
May 6, 2016

Geography can someone please help me NOT ms.sue
I passed sixth grade.
May 6, 2016

Geography can someone please help me NOT ms.sue
It is all there in the Google stuff, political, economic and well I am not sure about socially. I have never been very social.
May 6, 2016

Geography can someone please help me NOT ms.sue
They named a beer after him.
May 6, 2016

Geography can someone please help me NOT ms.sue
http://www.google.com/search?q=stamp+act+unfair&ie=utf-8&oe=utf-8 You have got to be kidding.
May 6, 2016

Geography can someone please help me NOT ms.sue
That grouchy one in Massachusetts.
May 6, 2016

MATH PLEASE HELP FAST
1. 8 - 3 is NOT 11 but 5 what is 7+4? about 11 ? what is 1 - 3 maybe -2 look for f^2 + 11 f - 2 Now you do them more carefully
May 6, 2016

Physics
volume of water displaced = .1034^3 = .0011055 m^3 times density of water which is about 1000 kg/m^3 =1.106 kg of water displaced Archimedes says we can float that much mass .150 + m = 1.106 m = .956 kg = 956 grams
May 5, 2016

Physics
Why would surface area have anything to do with it?
May 5, 2016

Physics
diameter has nothing to do with it. rho g h = 1000 kg/m^3 * 9.81 * 30.34 Pascals
May 5, 2016

trig, precalc, math, algebra, trigonometry
cos theta = adjacent/hypotenuse call adjacent side v call hypotenuse 1 then cos theta = v opposite side = sqrt(1^2 - v^2) tan theta = sqrt(1-v^2) /v
May 5, 2016

Physics
If x is horizontal, there is no x component of weight. If x is down the slope then assuming you really mean 76 kg it is 76 * 9.81 * sin 10
May 5, 2016

Algebra
n and 2n-1 n + 2n - 1 = 20 3 n = 21
May 5, 2016

Science
I agree
May 4, 2016

PHYSICS
You push them to make them faster increasing their momentum. However they can not go a lot faster so that increased momentum shows up as mass rather than velocity. m = mo/sqrt (1 -v^2/c^2) as v ---> c the mass gets huge approaching undefined.
May 4, 2016

Math
x and x+5 x(x+5) = 6 x^2 + 5 x - 6 = 0 (x-1)(x+6) = 0 x = 1 or -6 if x = 1 x+5 = 6 and if x = -6 x+5 = -1
May 4, 2016

Parametric Curve
LOL e is a horizontal line, y = 5 b is a parabola, do what I suggested.
May 4, 2016

Parametric Curve
Well, I suppose if you do not see it as is, you can do x and y for example in (a) y = 4t-2 x = t+1 so t = x-1 y=4(x-2) - 2 y = 4 x -10 dx/dt=dy/dt = 0 so constant speed (d) If you do no see it is a circle, do the same thing again y = (2t+1) cos t y^2 = (2t+1)^2 cos^2 t x^2 = (...
May 4, 2016

math nid this asap tyy
m g h = (1/2) m v^2 h = v^2/2g v the same v^2 = 2 g h 2 * 9 .8 * 2.35 = 2 * 1.6 * h h = 14.4 meters
May 4, 2016

PLEASE HELP WITH ALGEBRA
You have 185 bands in the box pink 95/185 = 19/37 brown 90/185 = 18/37
May 3, 2016

0 through 10 is 11 spaces
10 equal sections from 0 to 10 ??? No, that is 11 1 to 10 would be ten sections 3 or 6 or 9 means answer = 3/11
May 3, 2016

Math
LOL, I will never say.
May 3, 2016

Math
21^2 = 441 22^2 = 484 23^2 = 529
May 3, 2016

Physics
well, I get 1.47*10^2 Joules Yes, work done = change in kintic energy
May 3, 2016

Physics
work = force * distance in direction of force 150 J = 10 d d = 15.0 m
May 3, 2016

Maths yr 6
(4/5) hr/manhouse * 3 man = 12/5 hr/house = 2 2/5 hr = 2.4 hr
May 3, 2016

statistics
50 shipped first one ok 29/50 second one 28/49 third one 27/48 etc down to eight of them then multiply
May 3, 2016

history
In question 5 I do not think the act was about age requirements but it was about racial discrimination. It allowed people of all races to register to vote and vote, and that includes primary elections.
May 2, 2016

check for typos
length or height? How many feet is A ?
May 1, 2016

Math
I already went through trying to draw a 60, 60, 60, 90 triangle with this student.
May 1, 2016

Math
You are welcome :)
May 1, 2016

Math
whew, finally someone got one right !!! :)
May 1, 2016

MATH
NO, To make D you need three 60 degree angles and a 90 degree angle. Try to draw that.
May 1, 2016

MATH
An equilateral triangle has three 60 degree angles. That leaves no corner for a 90 degree angle.
May 1, 2016

baloney
Please check for typos !! If you used length, width and thickness you probably mean ft^3 not ft^2. That messed you up big time when you wrote 144 which is square inches per square foot. What you want is CUBIC feet per CUBIC yard which is 3^3 = 27 ft^3/yd^3 ( despite the fact ...
May 1, 2016

mathematics-change of subject of the formula
(A/pi)^2 = r^2 (h^2-r^2) =-r^4+h^2r^2 r^4 - h^2 r^2 + (A/pi)^2 = 0 r^2 = [h^2 +/-sqrt(h^4-4A^2/pi^2)]/2 r = sqrt { [h^2 +/-sqrt(h^4-4A^2/pi^2)]/2 }
May 1, 2016

Math
(x-11)^2 = r^2 = x^2 - 22 x + 121 so I do not get d
May 1, 2016

math
.75 miles/4.5 min *60 min/hr = 10 mi/h
May 1, 2016

typo
If it grows exponentially you mean 15,000 * 1.07^x in other words compounding not 1.07 x In that case C is correct 1.07^12 = 2.25 A rough estimate to remember is that 7 percent compounded for ten years is about a doubling.
May 1, 2016

CONVERSIONS
there are 9 ft^2/ yd^2 because 3*3 is 9
May 1, 2016

MEASUREMENTS
0.254296875 mi^2 if it is really 162.75 acres If however that is a typo and you mean 1642.75 acres then 2.566796875 mi^2
May 1, 2016

Math - typo ?
4y = 3 x y = .75 x + 0 slope = +.75 line is not in quadrant 2 but in one or three
May 1, 2016

math
You could just as easily lose 5 or more as win five or more. The triangle is symmetric about that middle point note C = 252 for point C10,5 then 210 to the left and 210 to the right. The middle point can go either way Too bad you had an even number of questions :) That is what...
May 1, 2016

Ms Sue, not symmetric. Could get 5 wrong !
Note my check comment
May 1, 2016

math
note that if I split the probability of getting 5 right in half I would get .123 less which would be .5 :) (good check)
May 1, 2016

math
binomial distrution p(5) = C(10,5).5^5 .5^(10-5) = 252*.5^10 = .246 p(6 ) = C(10,6).5^6 .5^4 = 210 * .5^10 = .205 p(7) = 120 * .5^10 = .117 p(8) = 45 * .5^10 = .044 p(9) = 10 * .5^10 = .01 p(10) = 1 * .5^10 = .001 now add .623
May 1, 2016

math trick question
The same as the supplement of a supplement :)
May 1, 2016

math
a/b = b/(a-b) b^2 = a^2 - ab a^2 - ab -b^2 = 0 a = [b +/- sqrt(b^2 +4 b^2) ]/2 a = b [ 1 + sqrt 5 ]/2 a = 1.618 b sure enough now 3.7 could be a or b if b = 3.7 then a = 5.99 about 6 if a= 3.7 then b = 2.29 about 2.3
May 1, 2016

math-middle school
well, I suppose in some world B could be a negative angle, but not in ours.
May 1, 2016

7 th grade math
14/20 = 7/10 = 0.70 0.70 * 300 = 210 0.70 * 100 = 70 0.70 * 240 = 168
May 1, 2016

Calculus
k = P V^1.4 k = 40 * 14^1.4 k = 1609 so P = 1609 V^-1.4 dP/dt = 1609 (-1.4)(V^-2.4) dV/dt = -2253 (14)^-2.4 * -1 = 4 psi/s
May 1, 2016

Math
speed = 70+80 = 150 distance = 300 time = 300/150 = 2 h
May 1, 2016

physics
3000 * v = 15 * 1.5
May 1, 2016

Math NEED HELP!!!!!!
http://www.mathsisfun.com/geometry/construct-linebisect.html
May 1, 2016

Math
4*8 = 32 1*2 = 2 32/2 = 16
May 1, 2016

physics
185 * 8 = 1480 Joules 1480 Joules = 3537 cal
April 30, 2016

Chemistry
How many molecules do you have? Well how much mass in a mol? 3*12 + 7*1 + 16 + 1 = 60 grams for 6.022*10^23 molecules so we have 6.022*10^23 * 85.9/60 = 8.62*10^23 molecules each of those molecules has 3 carbon atoms 3*8.62*10^23 = 25.9 *10^23 =2.59 * 10^24 carbon atoms
April 30, 2016

physics
Fx = -a x^4 I assume you mean F= -25 x^4 dW = F dx = -25 x^4 dx W = -(25/5)x^5 at x = 1.25-at.75 W = -5 (1.25^5 - .75^5)
April 30, 2016

Maths
try reading here: http://www.mathsisfun.com/algebra/factoring.html
April 30, 2016

math
Yes, to do it on the number line start at 0 go left 8 to - 8 go right 14 to +6
April 30, 2016

check list of answers below
This has been asked over and over and over again, look below.
April 30, 2016

typo
You mean V = (4/3) pi r^3 dV/dt = (4 pi r^2) dr/dt (You really do not need calculus. It is the surface area times dr/dt)
April 30, 2016

MATH
No, because 3+5 = +8 , not 15
April 30, 2016

math
-9 + 5 + x = -1 -4 + x = -1 x = +3
April 30, 2016

MATH
-4 - 2 = -6
April 30, 2016

Geography -Yr10
During the second half of the 19th century, river shipping was of great importance, but, with growing competition from railways and demand for irrigation water (first used at Mildura in 1886), navigation practically ceased. ================================ In other words they ...
April 30, 2016

Math
weight at top = 15 -.1*50 = 10 average weight = (15+10)/2 = 12.5 12.5 * 50 = 625 ft pounds
April 30, 2016

Math
You are welcome.
April 30, 2016

Math
No, same answers both ways.
April 30, 2016

Math
I used the kinematics because I did not know if you knew how to integrate velocity to get distance.
April 30, 2016

Math
oh well v(t)= 38-2t or dx/dt = 38 - 2 t then x = c + 38 t - (1/2)(2)t^2 c = x when t = 0 call it 0 here x = 38 t - t^2
April 30, 2016

Math
I do not know if you know calculus or if you have kinetatic equations in your text. What we have here is a constant acceleration of -2 ft/s^2 a. 0 = 38 - 2 t 2 t = 38 t = 19 s b. d = Vi t + (1/2) a t^2 = 38 (19) - 19^2 = 19(19) = 361 feet or use average speed for 19 seconds...
April 30, 2016

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