Sunday
March 26, 2017

# Posts by Damon

Total # Posts: 29,623

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

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

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

You are welcome, good luck.
December 15, 2016

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
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

physics
suspect 1000 kg not 100 kg but anyway gravity down = 9.81 *100 = 981 N acceleration down = v^2/r Up force = F so 981 - F = ma = 100 v^2/r so F = 981 - 100 (400)/200 = 781 N but as you know if it is a real car I think 7810 N
December 12, 2016

Physics
I will guess that you mean the current leaves the battery and runs through r2 then splits and runs through r1 and r3 in parallel then joins again and runs through r4 back to the battery. If I guess right then r1 and r =3 in parallel are r1 r3 /(r1+r3) = 90*40/(130) = 3600/130...
December 12, 2016

SS HEEELLLPP!!!
I think that is a matter of opinion, not history. Check your text for what they say. I am not sure the Great Wall was such a success militarily. There seem to have been plenty of intruders from the north after. My own opinion is that the most important thing was the ability of...
December 12, 2016

Physics
x momentum = 16*30 = 480 g cm/s -x momentum = 4*50 = -200 g cm/s total x momentum = +280 g cm/s That will NOT CHANGE ! new mass = 16 + 4 = 20 g so 20 * Vx = 280 Vx = 14 cm/s
December 12, 2016

60 sqrt 2 hypotenuse = sqrt (60^2+60^2) = sqrt (2 * 60^2) = 60 sqrt 2 = 84.85
December 12, 2016

physics
Vi = 30 sin 30 = 15 = initial speed UP u = 30 cos 30 = 26 = horizontal speed until caught v = Vi - 9.81 t at top v = 0 (First answer) so at top t = 15/9.81 = 1.53 seconds upward bound THE ACCELERATION IS -9.81 m/s^2 the ENTIRE TIME that it is airborne
December 12, 2016

check for typo
The way you wrote it k x^2 = (3k-5) x = +/- sqrt(3 - 5/k) but I wonder if you mean kx^2 -3kx+5 which would be x = [3k +/- sqrt(9k^2-20k) ]/2k
December 12, 2016

Chemistry
k m/r^2 so (3/4)(804)
December 12, 2016

algebra
I guess maybe you mean 6/ (?3 + 2 ) if so then [ 6/(?3+2)] * [(?3-2)/(?3-2)] 6(?3-2)/[3-4] -6?3 + 12 which is B
December 12, 2016

Physics
Archimedes said Force up = weight of fluid displaced. It displaced 6.4-5.6 = 0.8 kg of water so its volume is V = .8 kg (m^3/1000kg) = 8*10^-4 m^3 so its density is (6.4 /8)10^4 kg/m^3 =8000 kg/m^3 might be iron
December 11, 2016

physics
suspect STATIC is 0.68 .68 m g = starting Force .55 m g = constant velocity Force
December 10, 2016

Algebra
1-4k >= -11 and -1+4k >=-11 -4k >= -12 _and ___4k>=-10 4 k <= 12 __and_____k>=-2.5 k <= 3 note arrow reverse when signs changed so in the end between -3and +3 -2.5 <= k <= 3
December 10, 2016

Physics
You could have done that, patience :)
December 10, 2016

Physics
Total force up =100(9.81) = T1 sin37 + T2 sin 53 Total horizontal force = 0 = T1 cos 37 - T2 cos 53 use that to get T1 and T2 now for example moments about left end T2 sin 53 *5 = 100*9.81* X
December 10, 2016

Math
3(-2)(-2) -2(-2)(3) + 10 12 + 12 + 10 34
December 9, 2016

system of equations
Oh, and you might want to click on "very detailed solution" :)
December 9, 2016

system of equations
Click on Gauss Jordan there of course.
December 9, 2016

system of equations
5 -3 -34 10 -5 -65 (-5, +3) see http://matrix.reshish.com/gaussSolution.php
December 9, 2016

whoops sorry
xp = 100 +/- 50sqrt2 so about 30 (NOT 70 AS I SAID) if xp = 30 yp = .01x^2 = 9
December 9, 2016

Calculus
y = a x^2 100 = a(10,000) a = .01 so our parabola is y = .01 x^2 now a tangent to that parabola must pass through (100,50) slope = .02 xp at parabola y = (.02xp)x + b 50 = 2 xp + b b = 50-2xp but yp = .01 xp^2 and yp =.02xp^2 +50-2xp .01 xp^2 = .02xp^2 + 50 - 2 xp .01 xp^2 -...
December 9, 2016

where is the equation?
I might be able to solve for x given that y is 15 if I had any idea what the equation was.
December 9, 2016

la
Well I suppose your own :)
December 9, 2016

math help
3 < 4 three is less than four 4 > 3 four is greater than three and by the way 4<=4 four is either less than or equal to four
December 9, 2016

physics
31 cos 35
December 9, 2016

work and energy PHYSICS
at O where h = 0, all kinetic, E= (1/2)m Vi^2 + 0 at Q, not moving any more E =0 + m g Q Total energy during whole trip E = (1/2)m v^2 + m g h as h goes up to Q, v goes down to 0 using the start and finish points (1/2) m V^2 = m g Q Vi^2 = 2 g Q Vi = sqrt(2gQ)
December 9, 2016

Physics - studying for finals
for the second part, out in a phase angle .05 sin[(2pi/.75)(x+.375t) -PHI] (2pi/.75)(0.50) -PHI = 0 PHI = 2 pi (.5/.75)
December 8, 2016

Physics - studying for finals
A =0.0500 m L = 0.750 m T = 1/5 = 0.2 goes .75 m in .2 s so v=.75/2 = .375m/s for constant phase (x+vt) the+vt makes it left to make it go 2pi for every wavelength l or time T sin [2 pi (x+vt)/L] now the size .05 sin[(2pi/L)(x+vt)] more numbers in .05 sin[(2pi/.75)(x+.375t)]
December 8, 2016

Math
(x-1)(3x-2)(x-4i) but (x-4i)is not allowed alone, we also need its complex conjugate (x-1)(3x-2)(x-4i)(x+4i) I get 3x^4-5x^3+50x^2-80x+32
December 8, 2016

Math
8x + x = 9 x = 63 x = 7 so 8x = 7*8 which is about 56 as I remember.
December 8, 2016

physics
v = g t = 9.81 * 10 = 98.1 if no air drag but with friction terminal speed is 21 so 21 m/s
December 8, 2016

Math
x = -2 is a vertical line through the point (-2,0). Y can be anything.
December 8, 2016

Math (optimization) really confused
three fences of length x two fences of length y A = xy = 225 so x = 225/y p = total length = 2y + 3 x we want to minimize p p = 2 y +3(225/y) dp/dy = 0 at max or min dp/dy = 0 = 2 -675/y^2 2 y^2 = 675 y^2 = 337 y = 18.4 x = 225/18.4 so what is 2y+3x?
December 8, 2016

They were people, humans.
December 8, 2016

Physics
F * 0.24m = 31Nm so F = 31 Nm/0.24m
December 8, 2016

Physics
try throwing something up and see if time stops and moved backwards while the object falls back down.
December 8, 2016

what do you think ?
The force on this object is F = - m g so a = -g What are your answers?
December 8, 2016

Post a New Question