Tuesday
February 21, 2017

Posts by Damon

Total # Posts: 29,370

Mathematics
50 (30/25) = 2*30 = 60
December 22, 2016

Social Studies
Where should I start???? Load and unload ships, trucks, trains, and planes or in the case of ports at the mouth of rivers (New Orleans, Rotterdam), transfer cargo between river barges and seagoing ships. Builds and repair ships and port facilities. Do the paper work and number...
December 21, 2016

math
(0,5800) and (5,7420) (7420-5800)/5 = (y-5800)/(x-0)
December 21, 2016

math
Well I showed you that the first choice is NOT a solution to the equation. However It might not be the only one. Check them all.
December 20, 2016

math
Try each of them for example -52 = -5(10) - 4 -52 = -54 I do not think so check the others as well.
December 20, 2016

Math
You are welcome.
December 20, 2016

Math
L,w,h area = 2 Lw + 2 Lh + 2wh = 600 so Lw+Lh+wh = 300 but L = 3w so 3 w^2 + 4 w h = 300 now V = L w h = 3 w^2 h so h = V/3w^2 3 w^2 + 4 w(V/3w^2) = 300 4 V/3w = 300 - 3 w^2 (4/3)V = 300 w - 3 w^3 we want d(4/3)V /dw = 0 300 = 9 w^2 w = (10/3)sqrt 3 L = 10 sqrt 3 w L = 100 so...
December 20, 2016

physics
I agree but wonder about the straight line. There is not enough gravity to hold them down, but there is still a force toward the earth center so I think the departure path would curve.
December 20, 2016

Math
You never know who will be online. All you can do is post the question. There are a lot of math teachers who check in here.
December 20, 2016

Math
Yep, it's right :)
December 20, 2016

calculus
right triangle 3,4,5 or 60,80,100 x= 60 y = 80 z = hypotenuse = 100 dx/dt = 80 dy/dt = 100 z^2 = x^2+y^2 2 z dz = 2 x dx + 2 y dy z dz/dt = xdx/dt +y dy/dt 100 dz/dt =60*80+80*100 dz/dt = 6*8+80 dz/dt = 128 km/hr
December 20, 2016

History
Heavens! Look at a map. What is the biggest river in the now United States? Texas where the beef comes from for Richmond is west of the river. Remember that fleet coming up from the Gulf of Mexico ("Damn the torpedoes" :)
December 20, 2016

another no way
You try first. I already took the course.
December 20, 2016

No way
I do not see any attempt by you to do these problems. I already took this subject and do not need the practice. You try first. Also read what you typed.
December 20, 2016

Math
25-13 = 12 which is the sum of the two bases at the ends h is the height area of rectangle in the middle = 13 h x is base of one triangle (below the 10) so 12-x is the other(below the 15 (12-x)^2 + h^2 = 225 x^2+h^2 = 100 ---------------------subtract 144-24x = 125 x = 19/24 ...
December 20, 2016

math
(9/14)(35,000) =
December 20, 2016

Math
Yes but do the division 9/3 = 3 laps/min 30/6 = 5 laps/min 20/5 = 4 laps/min Mary does the most laps /min
December 20, 2016

math
s = 3d d + 3d = 116 4 d = 116 d = 29 so s = 87
December 20, 2016

Math (please help!!)
It is also the incenter B http://www.google.com/search?q=incenter+of+triangle&ie=utf-8&oe=utf-8 and point of concurrency C http://www.google.com/search?q=iconcurrency+of+perpendicular+bisectors&ie=utf-8&oe=utf-8 and D
December 20, 2016

30 to what ?
30deg to horizontal or vertical? In either case, use Snell's law.
December 20, 2016

math
5 per year 5*20 = 100 twenty years
December 20, 2016

history
Clove production, slaves See: www.blackpast.org › Geography: Global African › Africa › KenyaSeyyid Said, also known as Said ibn Sultan, was a resourceful and energetic sultan ... moved the capital from Arabia to Zanzibar in order to initiate clove production...
December 20, 2016

Social Studies
push --> potato famine and nasty bosses drive people out pull ---> jobs and land draw those people as immigrants to Ellis Island.
December 19, 2016

calcululs help me
4x^2+8xy+9y^2-8x-24y+4=0 8xdx+8xdy+8ydx+18ydy-8dx-24dy=0 (8x+18y-24)dy= -(8x+8y-8)dx dy/dx = (-4x-4y+4)/(4x+9y-12)agree numerator = 0 when x+y=1 yes find d/dx(dy/dx)of (-4x-4y+4)/(4x+9y-12) = [(4x+9y-12)(-4dx-4dy)-(-4x-4y+4)(4dx+9dy)]/dx[(4x+9y-12)]^2 =4[(4x+9y-12)(-dx-dy)+(+...
December 19, 2016

chemistry
ZnO + 2HCl ---> ZnCl2 + H2O By the way H2O is ...... Zn = 65 g/mol O = 16 g/mol H = 1 g/mol Cl =35.5 g/mol 13.64 g ZnCl2 * 1 mol/(65+71)g = mols of ZnCl2 now you should be able to continue.
December 19, 2016

American History
I think A) http://millercenter.org/president/biography/monroe-foreign-affairs
December 19, 2016

error !
I multiplied by distance not time average speed = v/2 distance = .25 = t (v/2) t = .5/v then 3 v = 20 *.5/v 3 v^2 =10 v^2 = 10/3 v = sqrt(10/3) ================== check 3 v = 20 * t 3 sqrt (10/3)= 20 * .5/sqrt(10/3) 3 (10/3) = 20 * .5 yes
December 19, 2016

physics
change in momentum = force * time 3 v = 20*.25
December 19, 2016

algebra 2
ticket price p = 231/n p-4.5 = 231/(n+3) 231/n - 4.5 = 231/(n+3) 231(n+3)-4.5(n^2+3n) = 231 n 231*3 -4.5 n^2 - 13.5n = 0 4.5 n^2 + 13.5 n - 693 = 0 n = 11 or -14 so 11 =========================== check 231/11 = 21 231/14 = 16.5 yes, diff = 4.50
December 19, 2016

Physics
In other words unless there was energy input from a explosion on impact or something, no way the big block took off at 4.0 m/s
December 18, 2016

Physics
huh? .5*5 *2.9^2+.5*10*2.1^2 = 43.1 Joules .5*5 *0.9^2 + .5*10* 4^2 = 81.1 81.1-43.1 = 38 Joules more Something exploded :)
December 18, 2016

American History
ah come on !!!!
December 18, 2016

calculus
I assume you mean x^2 - x y - y^2 = 5 2 x dx - x dy -y dx - 2 y dy = 0 (2y-x)dy = (2x-y)dx dy/dx = (2x-y)/(2y-x) slope is undefined (vertical) when 2y-x = 0 or x = 2y so x^2 - x y - y^2 = 5 4y^2 -2y^2-y^2 = 5 y = +/-sqrt 5 then x = +/- 2 sqrt 5
December 17, 2016

calculus
surface area in m^2/radius in meters is meters radians is arc, no units so meters per radian
December 17, 2016

algebra
If any one of those three factors is zero, then the product is zero so z = 0 works z-1 = 0 works so z = 1 works z+3 = 0 works so z = -3 works therefore z = 0 or 1 or -3
December 17, 2016

Algebra 1- Urgent
In your table in part B the ratio is for example 10406.04/10303.01 = 1.01 check: 10303.01/10201 = 1.01 sure enough so that is increasing by ONLY ONE percent per year
December 17, 2016

I do not believe you
I think you have a very fundamental typo. We are talking about a constant rate of inflation here I bet you mean f(x) = 0.69 (1.03)^x in other words TO THE POWER x that would be 0.69 when x = 0 years, now 0.69 * 1.03 after one year 0.69 * 1.03 *1.03 after two years 0.69 *1.03*1...
December 17, 2016

Algebra 1- Help please
option 1 is not linear because it does not change by the same amount every year. It does not have a constant slope. option 2 increases by 100 per year, constant slope, straight line, linear ----------------------- a = A y^n 1100 =A y 1210 = Ay^2 1331 = A y^3 --------------- ...
December 17, 2016

SS, PLZ HELP ME FAST!!!!
hint: Japanese eat a lot more fish than people on the great plains eat.
December 17, 2016

Calculus!! HELP!!
1) The sides of the triangle shown increase in such a way that (dz/dt=1) and (dx/dt=(3dy/dx)) At the instant when x = 12 and y = 5, what is the value of dx/dt? ========================= You do not say but I suspect this is a 5,12,13 right triangle. If I am guessing right about...
December 17, 2016

Maths
I do not know what using rotational axis means but this is an ellipse 4(x^2-2x) +9(y^2+6y) = -4 complete squares 4(x^2-2x+1)-4+9(y^2+6y+9)-81=-4 4(x-1)^2 +9(x+3)^2 = 81 (x-1)^2/4.5^2 + (x+3)^2/3^2 = 1 ellipse
December 17, 2016

Math
area = (1/2)12*5 = 30 hypotenuse BC = 13 the area = 30 = (1/2)13*AD AD =60/13
December 17, 2016

Math
120,000/50 = 240,000/100 = 2400
December 17, 2016

Probability and distribution
16 total to start I could draw a white, then blue 6/16 * 7/15 or I could draw a blue, then white 7/16 * 6/15 add them 2(42/240) = .35
December 17, 2016

math
Try then (a^9/2)^3 = a^27/ 8
December 16, 2016

History homework question
Oh, 20th Century Leaders :) Civil Disobedience.
December 16, 2016

History homework question
Hudson River school is paintings. I do not understand the second question.
December 16, 2016

American history
well, if only about in Americas (not India, Africa etc) Spain - get gold out, make Catholics France - get fur and fish out, make Catholics. Do not send many French people, just a few missionaries and trappers. England - make trading partners that grow food and ship masts and ...
December 16, 2016

physics
v = omega r 10 = omega(2) omega = 5 radians/second Ac = v^2/r = omega^2 r = 25*2 = 50 m/s^2 F = m a = .5 *50 = 25 N (not 25.5)
December 16, 2016

is (-2x)^-3 3 root of -2x?
(-2x)^-3 = 1/(-2x)^2 = 1/[-2x(-2x)(-2x)] = 1/[(-8)(x^3)] =-1/(8 x^3)
December 16, 2016

Maths
subtract area of inside circle from area of outside circle radius inside = 28/2 = 14 radius outside = 14+3.5 = 17.5 so pi(17.5^2-14^2)
December 16, 2016

Huh
Your minister of education has two brains and they are headed for somewhere else?
December 16, 2016

Jong
Hair?
December 16, 2016

typo
x = 1 and y = 1 at t = 0 y = .5 x + b 1 = .5 + b b = .5 y = .5 x + .5
December 16, 2016

calc
y = sin t + cos^2 t - sin^2 t dy/dt = cos t -2cost sint -2 sint cost at t = 0 dy/dt = 1 x = cos t +2 sin t cos t dx/dt = -sint -2sin^2t+2 cos^2t at t = 0 dx/dt = 2 dy/dt / dx/dt = 1/2 = slope x = 1 and y = 1 at t = 0 y = 1 x + b b = 0 y = x
December 16, 2016

Math
1/(x+h) - 1/x (x - x - h)/(x^2+xh) -h/(x^2+xh) divide by h -1/(x^2+xh) let h--->0 -1/x^2 sure enough
December 16, 2016

linear programming problem
the intersection with p max is of 5x+10y=560 and 50x+20y=1600 x = 12, y=50 and p = 3220 http://www.wolframalpha.com/widget/widgetPopup.jsp?p=v&id=1e692c6f72587b2cbd3e7be018fd8960&title=Linear%20Programming%20Calculator&theme=blue
December 16, 2016

calculus!
at x+h y = 1/(3-x-h) at x y = 1/(3-x) subtract 1/(3-x-h) -1/(3-x) [(3-x) -(3-x-h)]/[(3-x-h)(3-x)] [ h]/[ x^2-6x+xh-3h+9] divide by h 1/[x^2-6x+9 +xh-3h] let h --->0 1/(x-3)^2
December 16, 2016

Math - Coordinate Geometry
3y = 2 x + 3 is y = (2/3)x + 1 slope = 2/3 so y = (2/3)x + b if parallel -4 = (2/3)6 + b b = -8 so y = (2/3)x-8 3 y = 2 x - 24
December 16, 2016

math
3078+582 = 3660 =3*1000 + 0*100 + 7*10 +8*1 +0*1000 + 5*100 + 8*10 +2*1 =3*1000 + 5*100 +15*10 +10*1 =3*1000 + 6*100 + 5*10 +10*1 =3*1000 + 6*100 + 6*10 + 0*1 = 3660
December 16, 2016

Science
Now I am sure you know these answers (although I consider a fossil biological). I would be willing to review them but not just answer them.
December 16, 2016

Geometry
I guess it is supposed to be a triangle? If so ac can not be longer than 11+13 = 24 and it can not be shorter than 13-11 = 2 DRAW IT !
December 16, 2016

Sociology
They mean the same thing to me. Homogeneous is opposite to diverse.
December 16, 2016

calculus
LOL, either way I do physics, I find t easier to visualize step by step.
December 16, 2016

calculus
dV/dt = 3ft^3/min(1 min/60s) = .05 ft^3/s so V = .05 * 30 = 1.5 ft^3 at 30 s V = (4/3) pi r^3 so r = 0.71 ft at 30 s dV/dr = 4 pi r^2 (the surface area of course) but dV/dt = dV/dr * dr/dt so dr/dt = dV/dt / (4 pi r^2) dr/dt = .05 /(4 pi*.71^2) = .00789 feet/second
December 16, 2016

Gauss-Jordan elimination
-3 +3 -21 +3 +2 -4 ============= http://www.idomaths.com/gauss_jordan.php ===================== 1 0 2 0 1 -5 x= 2, y = -5
December 15, 2016

HELP SCIENCE
Which do you think? What does north and south pole mean?
December 15, 2016

augmented matrix
No unique solution, equations are the same +3 +1 -11 -9 -3 +33 http://www.idomaths.com/gauss_jordan.php 1 0 -3.667 0 0 0 x = -3.6666.... or -11/3 y can be anything equation 2 is -3 times equation 1 Therefore the two lines are the same, they do not intersect, there is no solution
December 15, 2016

Physics
3.) An 80.kg climber with a 20.0 kg pack climbs 8848 m to the t?op of mount everest. how much work did the climber exert in the climbing the mountain ==================== 100 kg up 8848 meters 100 * 9.81 * 8848 = 8,679,888 Joules (That is the useful work, his efficiency would ...
December 15, 2016

Physics
When the string is cut, the bob has only horizontal velocity u. It keeps that horizontal velocity u until it hits the ground because there is no horizontal force after that. So there are two separate problems here: 1. How far does it go at constant speed u for time t? 2. If ...
December 15, 2016

Math 4th Grade
You are welcome, good luck.
December 15, 2016

Math 4th Grade
280 = 2 x m 28 = 2 x 14 280 = 2 x 140 so m = 140 I am not sure why I would want to do it that way though. If you can handle 2 x 14 I bet you could handle the tens part.
December 15, 2016

Sets
Union is 107 Intersection is 13 draw Venn diagram 69 + A alone = 107 so A alone = 38 plus A and B = 38+13 = 51
December 15, 2016

Measurement/math
35*circumference = 100
December 15, 2016

Algebra
check it yourself like this: 11 + (-.7) = -15(y) ????? I think x = 19 and y = -2 http://www.idomaths.com/gauss_jordan.php with +1 15 -11 +2 -5 +48
December 15, 2016

Math
1/4 + what = 11/12 ???? 3/12 + what = 11/12 well how about 8/12 so 1/4 + 8/12 = 11/12 or 1/4 + 2/3 = 11/12
December 15, 2016

Algebra II
What is an L ?? Perhaps a Newton??? if cm^2/then D for Dyne anyway v = k/p 16 cm^3 = k / 20L/cm^2 k = 16*20 v = 16*20/2.2 = 145 cm^3
December 15, 2016

maths calculas part
144/4 = 36 36*36 = 1296 m^2 now how did I know it was square? 2x+2y = p = perimeter so x+y = p/2 so y = p/2-x A = x y = x(p/2-x) A = (p/2)x - x^2 or x^2 - (p/2)x = - A x^2 -(p/2)x + (p/4)^2 = -A + p^2/16 [ x - (p/4)]^2 = - (A-p^2/16) so vertex at area = (p/4)^2 and x = y = p/4...
December 15, 2016

Maths
if there are five of them and the median is five I think five is an integer a b c d e c = 5 (a+b+c+d +e)/5 = 5 so a+b+5+d+e = 25 a+b+d+e=20 with d and e >5 and a and b <5 well what if a = 1 b= 2 d= 7 e = 10 1 2 5 7 10
December 14, 2016

precalculus
P(k+1) = p(k) + 5
December 14, 2016

Math
volume is proportional to length cubed for similar geometry 2 times length is 4 times area 2 times length is 8 times volume so 1875(16/40)^3 = 1875(.064) = 120cm^3
December 14, 2016

physics
centripetal acceleration: To stay at the same radius, a water particle of mass m must have a force on it inward of m v^2/r. Until it hits the walls of the container, that force is missing. If the water particle happens to hit upon a hole in the wall or dribbles down the wall, ...
December 14, 2016

Science 6
B skunk eats toads I do not think toads and mice compete for who has the honor of being eaten by the fox
December 14, 2016

Algebra
1 q + 1 n = 13 1 q + .2n = 8.2 ---------------subtract .8 n = 4.8 so 6 nickels
December 14, 2016

precalculus
as you can see in the other answers, yes 4y^2+8y-2
December 14, 2016

precalculus
I guess you might mean: x = t^2-6 y = .5t - 1 ????? if so, just substitute 2y = t -2 t = 2 y +2 then x = 4(y^2+2y+1) -6 x = 4y^2 + 8y - 2 sketch that parabola
December 14, 2016

precalculus
hyperbola opening right and left center at (0,0) crosses x axis at -1 and +1 slopes at corners = +/- 2
December 13, 2016

linear programming
maximize p p = 6s+5b s+b</=70 b>/=20 s>/=10 sketch a graph there are two intersections to check (s,b) = (10,60) here p= 60+300 = 360 and (s,b) = (50 ,20) here p=300 + 100 = 400 (winner)
December 13, 2016

physics
Fup = 400 Fdown = 9.81*50 =491 so accelerating down a down = 91/50 m/s^2
December 13, 2016

Science-y Math-y Stuff
0.8 x = 4,000
December 13, 2016

Science
There was this guy in Sicily , Archimedes: http://www.math.nyu.edu/~crorres/Archimedes/Lever/LeverIntro.html http://en.wikipedia.org/wiki/Lever
December 13, 2016

Physics
alternatively you can use conservation of energy kinetic energy at bottom = potenial energy at top (1/2)mVi^2 = m g h so Vi^2 = (2 g h) h = Vi^2/2g
December 13, 2016

Physics
get vetical component of velocity up at ground, call it Vi. If shot at angle A up from horizontal then Vi = V sin A during flight acceleration = -g or 9.8 m/s^2 down or 32 ft/s^2 down speed up = v = Vi - g t = Vi -9.8 t or = Vi -32 t at top, v = 0 so t = Vi/9.8 or t = Vi/32 ...
December 13, 2016

Physics
average speed during initial slowdown = (80+40)/2 = 60km/h 60 km/h * t = 0.5 km t = 5/600 hours = (1/120)hr (1 hr/120)(60min/hr)(60s/min) = 30 seconds so a = change in speed/time = -40 km/hr /30 s = (-40 * 1000 m/3600s)/30s = -(4/3)/3.6 m/s^2 so Vi = (40/3.6) m/s final v = 0 =...
December 13, 2016

I THINK I FIGURED IT OUT!
8 works if you reverse order
December 13, 2016

Math
2/5 = 10/x x = 25
December 12, 2016

Pre-Calculus
well if you mean (x^2-1) it is D but if you really mean (lim x^2) -1 which is what you typed it is A
December 12, 2016

Algebra
9(r-2)<-73 or 9(-r+2)<-73 first one: 9 r -18 < -73 9 r < -55 r < -55/9 sure looks like a solution second one: -9 r + 18 <-73 9 r -18 > 73 9 r > 91 r >91/9 so second solution
December 12, 2016

pre-calculus
square :) side = 50/4 = 25/2 A = x y P = 2x+2y = 50 so y = (25-x) A = x(25-x) = 25 x - x^2 x^2 -25 x = -A x^2 - 25 x + (25/2)^2 = -A + 625/4 x = 25/2 sure enough so y = 25/2 and A = 625/4 = (25/2)^2
December 12, 2016

Algebra
1. 8 is a factor of 12?? 12/8 = 3/2 = 1.5 2 55/5 = 11 3. You said what P was 4 and 5 are incomplete problem statements both A and B are subsets of U 2 is the intersection of A and B
December 12, 2016

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