Saturday
December 3, 2016

Posts by damon

Total # Posts: 28,237

Math
2^n
December 2, 2016

Math
5(.07)(8000)=2800
December 2, 2016

Calculus
Yes, of course -4-1 = -5 :)
December 2, 2016

Calculus
where do they hit? 4 x^2 = 45 - x^2 x^2 = 9 x = +/- 3 cylinder height = 45-x^2 - 4 x^2 = 45 - 5 x^2 cylinder thickness = dx cylinder circumference = 2 pi x so V=?[0,3]2 pi x(45-5x^2)dx
December 2, 2016

So what?
no question is asked.
December 2, 2016

physics
Vertical problem: at max height (half the trip) 600 = Vi t - .5*9.8 t^2 .5*9.8 t^2 - Vi t + 600 = 0 also v = 0 so 0 = Vi -gt t = Vi/g = Vi/9.8 so .5*9.8(Vi^2/9.8^2) - Vi^2/9.8 +600 = 0 600 = .5*VI^2/9.8 Vi = 108 m/s initial up speed t = rising time = 108/9.8 = 11.1 s total ...
December 2, 2016

Finite Math
A (1.0465)^6 = 15,000 A = 15,000/1.313516 = 11,419.73
December 2, 2016

physics
Ke = (1/2)(1260)(14.8^2) Joules go ahead and integrate m a dx if you want but energy is a lot easier.
December 2, 2016

Physics
total weight = (251+350)(9.81) + rhogas 9.81(4/3) pi (9.5)^3 where rhogas is the mass per unit volume of the gas in the balloon weight must = weight of air displaced = rhoout g (4/3)pi(9.5)^3 rho gas = kg/mol * n = .029 n where n is mols in PV =nRT T = 273 + T that we want rho...
December 2, 2016

Pressure in Physics
60 *9.81/10 N/m^2 or Pascals if you mean on the floor on earth and 10 is the floor area
December 2, 2016

maths
2 pi Ro = 44 solve for Ro then Ri = Ro - 2 so inner circumference = 2 pi Ri and Path area = pi(Ro^2-Ri^2)
December 2, 2016

math
16 = 4*4 12 =4*3 so 4*4*3 is LCM = 48 of each 3 packs HD 4 packs buns
December 2, 2016

Physics
google Bernoulli constant= v^2/2 + g z + p/rho in your units v in m/s p in Pascals(N/m^2) rho = 1000 kg/m^3 for water g about 9.8 v at bottom = 1.2 m/s v at top = 2 v at bottom =2.4 m/s z at top = z at bottom + .2 meters p/rho bottom =143000/1000 so 2.4^2/2 + 9.8(.2)+ 143 = 1....
December 2, 2016

Math
B yes C 128(0.5)^3 128*.125 = 16 yes D 128*.5^8 = 128* .00390525 = 0.5 YES !!!!!
December 1, 2016

Math
Gabby drove t-3 hours she drove 2 hours so t-3 = 2 and Ryan drove 5 hours D = Ryan speed * 5 D = Gabby speed * 2 so 5 R = 2 G but G = R+42 so 5 R = 2(R+42) 3 R = 84 R = 84/3 = 28 HUY - The DIFFERENCE is 42
December 1, 2016

Calculus 1
v = x^3 dv/dx = 3 x^2 dv/dt = dx/dt * dv/dx dv/dt = 4 * 3(121) cm^3/s
December 1, 2016

math
1000-850 = 150 interest 150 = 850 (.08) t
December 1, 2016

Pre-Calculus
satellite position is likely to be x, y , z of t :)
November 30, 2016

science
1. I disagree with you. People just assumed we were at the center. Partly religious 2. agree 3. agree 4. I agree with you. A and B are obvious. D is the sun and moon working together to produce spring tides when the moon is full and new and neap tides when the moon s half moon...
November 30, 2016

Algebra
v = dh/dt = 32 -32 t at top, v = 0 t = 1 h = 9+16 = 25 ====================== now with algebra 16 t^2 -32 t =9 - h complete square t^2 -2 t = (-1/16)(h - 9) t^2-2t+1 = (-1/16)(h - 9)+16/16 (t-1)^2 = -(1/16)( h-25) t = 1, h=25 same answer
November 30, 2016

precalculus
1 x +1 y = 2 1 x +1 y = 3 1 1 2 1 1 3 subtract top one from this 1 1 2 0 0 1 oh my! 0x+0y=1 ?
November 30, 2016

College alegbra
I assume this does not mean the perimeter but the total length of fencing. I assume x is the length and there are 3 y fences P = 2 x + 3 y x y = 1500 so y = 1500/x then P = 2 x + 4500/x x P = 2 x^2 + 4500 2 x^2 - xP = -4500 x^2 -xP/2 = -2250 x^2 -xP/2 + P^2/16 = -2250 + P^2/16...
November 30, 2016

Calculus
the function climbs uphill 15 from -3 to +12 in its jaunt of +5 from -1 to +4 that means that somewhere in between there the slope of the function is slope = 15/5 = 3 so at some x = c between x = -1 and x=+4slope = f'(c) = 3 so a)
November 30, 2016

Physics
(1/2) m v^2 = m g h or use Bernoulli (1/2) rho v^2 + rho g h + P = constant here P = 1 atm on top of the tank and at the outflow so the two ways are the same v = sqrt (2 g h ), just like the water fell amount that comes out per second = Q = Area*v = pi r^2 v = pi*10^-4 v so Q...
November 30, 2016

Physics
F/m = 2/60
November 30, 2016

physics
a = F/1 = i + 2 j -2 k v = Vi + a t x = Xi + Vi t + (1/2)a t^2 v at 5 = i+0j+2k + 5i +10j -10k = 6i + 10j - 8k x at 5, well assume start at (0,0,0) x = 0 +(i+0j+2k)5 +(1/2)(i + 2 j -2 k)25 = 5i+0j+10k+(1/2)(25i+50j-50k) =17.5 i +25 j -15 k check my arithmetic !
November 30, 2016

Physics
yes, both in watts or Joules/second
November 30, 2016

Math
same as when tan = -1 which is when theta = 90+45 =135 = 3 pi/4 or when theta = 360 - 45 = 315 = 7 pi/4
November 30, 2016

Physics
m v^2/r = 50 * 64 / 8 = 400 m/s^2
November 30, 2016

Calculus AB
-(x^4 - 5 x^2 + 6) / (x +3^.5) -(x^2-3)(x^2-2) /(x+3^.5) OH LOOK! -(x-3^.5)(x+3^.5)(x^2-2)/(x+3^.5) = -(x-3^.5)(x^2-2) when x is -3^.5 = -(-2*3^.5)(1) = 2 sqrt 3 Now there is a limit and I am at it without you doing some.
November 30, 2016

Calculus
is x^(1/5) defined and continuous in that interval? (-1)^(1/5) = -1 etc, seems ok how about arc cos x that looks fine x/(x-3) woukld blow up at x = 3, but we do not go there so it is ok but Oh my, sqrt(-1) is imaginary! and is called i for want of a real number to use. It is a...
November 30, 2016

Integral Calculus
Height = sin x radius = (3 pi/2 -x) = r so dr=-dx d volume = sin x (2 pi r (-dr)) = 2 pi sin x (3pi/2-x)dx =2 pi(3pi/2) sin x dx - 2pixsin x dx = -3 pi^2 cos x - 2 pi [sinx-xcosx] = [-3 pi^2+2pix]cos x -2 pi sin x at pi - at 0 sin is 0 at both so cos pi = -1 so - [-3 pi^2+2pi^...
November 30, 2016

Algebra (Please Check My Answers)
4. James attached a diagonal brace across a rectangular frame that measures 6 feet by 8 feet. What is the length of the diagonal brace? ~ 2 feet ~ 10 feet ~ 14 feet ~ 48 feet*** =================== 36+64 = 100 sqrt(100) = 10
November 30, 2016

ss
I am inclined to think you made the correct guess.
November 30, 2016

Math
Hmm be sure to put the numbers back in to check. a = 20 and c = 10 13 + 3 = 16
November 30, 2016

Math
a = 2 c a-7 + c-7 = 16 2 c + c - 14 = 16 3c = 30 c = 10
November 30, 2016

Math
x+35 + 5x-21 =180
November 30, 2016

CHEM 1301
H = 8/3 *12.2 = 32.5 12.2 + 32.5 = 44.7
November 30, 2016

cal
Good :)
November 30, 2016

cal
g = (x-1)/(2x+4) dg/dx = [(2x+4)-2(x-1)]/(2x+4)^2 at x = -1 dg/dx = m the slope = [(-2+4)-2(-2)]/(2)^2 = 6/4 = 3/2 and g = -2/2 = -1 so y = m x + b -1 = 3/2 (-1) + b b = 1/2 so y = (3/2) x + 1/2 or 2 y = 3 x + 1 check my arithmetic!
November 30, 2016

cal typo ?
g = x -.5 x + 4 did you mean x^2 maybe? or what?
November 30, 2016

Algebra
4 a + 5.5 c = 92 a + c = 20 4 a + 5.5 c = 92 4 a + 4 c = 80 ------------------subtract 0 + 1.5 c = 12 c = 8 etc
November 30, 2016

math
maximize .085 x + .068 y x+y <= 50,000 x>=6,000 x<=27,000 y<=34,650 x+y>=1 phony to fill fields I get $3859 at (27000, 23000) ==================== http://www.wolframalpha.com/widget/widgetPopup.jsp?p=v&id=1e692c6f72587b2cbd3e7be018fd8960&title=Linear%...
November 30, 2016

cal
You are welcome.
November 30, 2016

cal
3 x^2 dx + 3 y^2 dy = 3 x dy + 3 y dx (y^2 -x)dy = -(x^2-y)dx dy/dx = - (x^2-y)/(y^2-x)
November 30, 2016

Math
56 = 2 * 28 = 2*2*14 = 2*2*2*7 can not have more than one 2 2*7 = 14
November 30, 2016

math
2 by 3/2
November 30, 2016

value
4/5 = .8
November 30, 2016

Math
+ C :)
November 30, 2016

Math
x - 6?xdx/( x^2+1) let z = x^2+1 dz = 2 x dx so x dx = (1/2)dz then x - 6?(1/2)dz/z x - 3 ln z x - 3 ln(x^2+1)
November 30, 2016

Math
?(x^2-6x+1)/(x^2+1) dx =?(x^2+1)dx/( x^2+1)-6?xdx/( x^2+1) = ?dx - 6?xdx/( x^2+1)
November 30, 2016

Portions and integers
Zero just gives you an arbitrary point on the number line to measure the other two points from. The fact that it happens to be the melting point of ice is irrelevant to this problem. -89 is colder than -39 -89 is LEFT of -39 on our number line -89 < -39 how much colder is ...
November 30, 2016

Not sure
skin, hair, nails the only thing listed that is related is the hand.
November 30, 2016

physics -- impossible
if r is the radius above earth center the speed is totally impossible. I suspect a typo
November 29, 2016

Huh initial height?
If the velocity is only 3 m/s at the bottom, no way it will go up 10 meters. Typo? Did you leave out an initial height?
November 29, 2016

math
2 x/5 + 35000 = 3 x/4 35000 = 15x/20 - 8x/20 = 7 x/20 5000 = x/20 x = 100,000
November 29, 2016

genetics - no idea
not my thing - need biology teacher
November 29, 2016

Physics
LOL valve straight down is stable (pendulum) valve straight up is unstable (balancing pencil on nose) I = mr^2 = 1.005(.36) (about .36) for angle x in radians, restoring moment is about .005*9.81 x r = .003*9.81 x oh well call g = 10 instead of 9.81 = .03 x .03x = -I alpha = -...
November 29, 2016

Algebra 2
74-m = m/2 + 11 63 = 3 m/2 m = 63*2/3 = 42 74 - 42 = 32
November 29, 2016

maths
yes
November 29, 2016

maths
250 - 80 = 170 girls (170/250)100 = ?
November 29, 2016

2
You can not row cotton profitably everywhere. You need the right soil and water conditions and preferably a large area of flat land. Rice in particular uses very different soil conditions, like wet. Virginia climate was very good for tobacco as was Ky and Tenn.
November 29, 2016

CHECK! LAST TIME MATH!
100% - 20% = 80% or .8 100% - 10% = 90%
November 29, 2016

CHECK! LAST TIME MATH!
call it 150 .8 *150 = 120 so yes .9 *120 = 108 so save about 42 total
November 29, 2016

math
15 is 1/4 of the way around to 60 min 360/4 = 90
November 29, 2016

Check It, Math
.06*5000 + .08*(10000-5000) = .14*5000 = 700
November 29, 2016

Math
5(0/10)+ 10/2=5
November 29, 2016

Interest Finite Math
huh? amount deposited = A Interest earned in 8 years on that is .05 * 8 * A = 1213 A = 1213/0.40
November 29, 2016

Physics
a 42*9.81 b 42*9.81 cos 34 c force down slope = 42*9.81 * sin 34 so a = 9.81 sin 34 d 3 = .5 (9.81*sin34) * t^2 t is answer to e v = a t = 9.81 sin 34 *t
November 29, 2016

Linear Algebra
or http://geomalgorithms.com/a02-_lines.html
November 29, 2016

math
3.25 * 360 = ?
November 29, 2016

Math
2 n/3 + 8 = 48
November 29, 2016

Social Studies
I do not see your map. However a major advantage for the North in the Civil War was that the North had a lot more rail transportation, even before Sherman went through.
November 29, 2016

what about it ?
y = -2 x -16 ???? you do not say what you want done
November 29, 2016

linear programming
did with linear programming, no need for simplex
November 29, 2016

The Simplex Method
164 at (8,12) http://www.wolframalpha.com/widget/widgetPopup.jsp?p=v&id=1e692c6f72587b2cbd3e7be018fd8960&title=Linear%20Programming%20Calculator&theme=blue max 10x+7y x+y<=20 x>=3 x<=8 x+y>=1 phony to fill all the blanks
November 29, 2016

Algebra2
(8^3)^x = 60 ?? 512^x = 60 x = log60/log512
November 29, 2016

algebra
looks like a letter V with the bottom on the y axis at -2 and slopes of 1 on the right and -1 on the left
November 29, 2016

social studies
Oh, sorry !
November 29, 2016

social studies
Van Buren was never president by the way.
November 29, 2016

Social Studies
I agree with you.
November 29, 2016

Social Studies
Well, it did not make slavery legal really in Massachusetts for example, but it said the owner could come get him which pretty much amounts to the same thing.
November 29, 2016

Social Studies
I guess, sort of.
November 29, 2016

Social studies
Even after they got here it happened google roger williams
November 29, 2016

College Algebra
2 ln (x-6) well I think x better be greater than 6
November 29, 2016

precalculus
(2x-1)/(x^2-1) = a/(x+1) + b/(x-1) 2x-1 = ax-a + bx + b 2 = a+b -1 = -a+b -----------add 1 = 2 b b = 1/2 a = 2-b = 3/2 so (3/2) / (x+1) + (1/2)/(x-1)
November 29, 2016

Math
(3 days/5 gal) * 60 gal = 36 days
November 29, 2016

Math
s = 5 R = 4 * 5 = 20 (5+x)2 = 20 + x 10 + 2 x = 20 + x x = 10 years from now 20 + 10 = 30
November 29, 2016

Pre-Calculus
let's put the center of each at 0,0 to make it easy ellipse x^2/a^2 + y^2/b^2 = 1 we could make a and b the same, but that would be a circle and too easy so lets make a = 2 and b = 1 x^2/4+y^2/1 = 1 then major axis along x = 2a = 4 vertex at -2,0 and + 2,0 (also at 0,1 and...
November 29, 2016

Math
equality wold be x = 5 inequality would be x < or = 5 which we write x </= 5 <5 means less than
November 29, 2016

Math
I told you above you can buy 1,2,3,4 or 5 but not 6 any positive whole number less than or equal to 5
November 29, 2016

Math
yes, but what are you going to use 0.454545.... of a CD for?
November 29, 2016

Math
11x <= 60 x<=60/11 since fractional CDs are not very useful x <= 5 I can buy 1,2,3,4 or 5 but not 6
November 29, 2016

math volume
I can not see your pictures but Base area = pi d^2 / 4 = pi in^2 base height = 3 pi in^3 = 9.42 in^3
November 29, 2016

social studies
The western hemisphere, from Brazil to the USA, experienced a huge INVOLUNTARY TRANSATLANTIC migration from Africa.
November 29, 2016

math
m minibuses m x number in minis n cars n y = number in cars 10 minibuses means m = 10 10 x in buses 6 cars means n = 6 6 y in cars so 10 x + 6 y = 150 but also 5x + 18 y = 150 now we have a plain old 2 eqn, 2 unknown problem multiply the second equation by 2 and we have: 10 x...
November 29, 2016

Physics
total mass = 2.5+1.2 = 3.7 kg omega = 2 pi f = 2pi/T = sqrt(2300/3.7) = 24.93 so T = .252 second normal force = m g = 1.2 * 9.81 = 11.77 Newtons max friction force = .56*11.77 = 6.59 when does m a = 6.59 N? 6.59 = 1.2 a a = 5.49 meters/s^2 magnitude of a = A omega^2 = A(24.93...
November 29, 2016

Physics
inward Ac = v^2/r tangential a = dv/dt 7.04 =sqrt[a^2 + (v^2/r)^2 ] 49.56 = 3.03 + v^4/289 v = a t = 1.74 t v^4 = 9.17 t^4 so 46.53 = 9.17 t^4/289 t^4 = 1466 t = 38.3 seconds Check my arithmetic!!!
November 29, 2016

PHYSICS
omega^2 R double omega, same R, four times 21.3 4*21.3 =
November 29, 2016

Physics
see http://www.jiskha.com/display.cgi?id=1480442177
November 29, 2016

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