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January 21, 2017

Posts by Damon

Total # Posts: 28,805

Calculus applications
first go here http://www.jiskha.com/display.cgi?id=1480944543
December 5, 2016

Math
749 is bigger than 500 so 123,166---> 123,167 123,167,000
December 5, 2016

Algebra
3x+2y=34 x+y = 15 so y = 15-x 3x +2(15-x) = 34 3x + 30 -2x = 34 x = 4 y = 11
December 5, 2016

which do you guess?
NOT B
December 5, 2016

Algebra 2
I bet you mean x^2 + y^2 = 16 well we could do it right or we could cheat and say we want a circle with center at (-8 ,-3) (x+3)^2 + (y+3)^2 = 4^2
December 5, 2016

URGENT 4TH GRADE MATH
You are welcome.
December 5, 2016

URGENT 4TH GRADE MATH
733.2
December 5, 2016

URGENT 4TH GRADE MATH
you want 22 characters? 733.166666666666666666
December 5, 2016

URGENT 4TH GRADE MATH
well, I know 6*7 = 42 so 6*700 = 4200 but 6*800 is too big so use 700 and then we have 4399-4200 = 199 left over 6* 30 = 180 so use 30 and I now have 730 and 19 left over 6*3 = 118 so use 3 and I now have 733 and one left over so 733 1/6 733 with a remainder of one
December 5, 2016

NO
You do not have 49 teachers!
December 5, 2016

VERY, VERY URGENT 4TH GRADE MATH!!!!!!!!!!!!!!!!!!
so 6 groups of 7 would require 42 teachers but 7 groups of 7 needs 49
December 5, 2016

VERY, VERY URGENT 4TH GRADE MATH!!!!!!!!!!!!!!!!!!
Hurry please, I am waiting on pins and needles. I know that 7*6 is around 42 and 7*7 is about 49
December 5, 2016

MATH URGENT!!!!!
slope 1 = (3-3)/(4-0) = 0 slope 2 = 2 2-0 = 2
December 5, 2016

wait a minute
it PRODUCES 150 J of heat? Usually one must put heat into an engine to get work out (boil water, burn gas). This is either a typo or a magic trick.
December 5, 2016

Physics
100(work out/heat in) the heat out to the other system is lost to this problem. Note that it is 110 which is what is left over after you take 40 out of your 150 see http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/heaeng.html
December 5, 2016

whoops
cos x =cos 2x cos 2x = cos^2x -sin^2 x where does cos^2x -(1-cos^2x) =cos x cos x = 2 cos^2x-1 2 cos^2x -cos x - 1 = 0 (2 cos x +1)(cos x -1) = 0 cos x = 1 or cos x = -1/2 x = 0 or 2 pi n or x = 2 pi/3 +2 pi n
December 5, 2016

Calc
why do you think the domain is from -pi to 3pi ? I think it is all real x df/dx = 2 cos x -2 cos 2x (hoping you did not mean sin^2x) at 7 pi 2sin 7pi = 0 in fact sin any number of pis is zero so we are looking for where the slope is 0 that is where cos x = cos2x well, that is ...
December 5, 2016

what do you mean?
What you typed y = a(x - h)2 + k, a ? 0 a line with slope 2a and y intercept 2 a h + k is VERY different from y = a(x - h)^2 + k, a ? 0 a parabola with vertex at (h,k) and upright (holds water)
December 5, 2016

precalculus
x 7-4 = 3 and directrix is above vertex (sheds water) so a = -3 (x+2)^2 =-4*3 (y-4)^2 = -12(y-4)^2 =
December 5, 2016

you do this one
Hey, I did the other one
December 5, 2016

wait a minute
I did the other one, you can find the x component of your speed around the circle.
December 5, 2016

Calculus 1
f(x,y) = x^3y^2 df = (df/dx) dx + (df/dy) dy df/dt=(df/dx) dx/dt + (df/dy) dy/dt but f is a constant = 2916 df/dx = 3x^2y^2 = 3*81*4= 972 df/dy = 2x^3y = 2*729*2= 2916 so 0 = 972 (dx/dt) + 2916 (2) dx/dt = -6
December 5, 2016

Math
y = cos (x)+ 3 x interchange x = cos y + 3 y if y = 0, x = 1 + 0 x' = -sin y + 3 but y = 0 at x = 1 dx/dy = 3 dy/dx = 1/3
December 5, 2016

Math
remember 1 worked for y, so not it works for x :)
December 5, 2016

Math
dy/dx = 5 x^4 + 6 x^2 + 1 but x is 1 here we know already dy/dx = 5+6 + 1 = 12 interchange dy/dx = 1/12
December 5, 2016

try interchanging x and y
y = x^5 + 2 x^3 + x - 1 exchange x and y x = y^5 + 2 y^2 + y - 1 now use 3 for x 4 = y^5 + 2 y^2 + y 1 works for y
December 5, 2016

Vectors
|a| = sqrt(3^2+4^2) about 5 I think. Now you do the other. Remember when you square a negative you get a positive.
December 5, 2016

Calculus applications
You are welcome.
December 5, 2016

correction
the shear, not the moment, changes instantly at the center
December 5, 2016

Calculus applications
If you want to draw it it is a seesaw with no one on it w pounds per foot of weight down (+) and a force up of wL = total weight at center :) Note that moment must be zero at both ends and will be maximum at the middle changing signs instantaneously M = w L (x/2) - w x^2/2 S...
December 5, 2016

science
ahh, which comes out to zero if he is not accelerating up or down :)
December 5, 2016

science
1500 * 9.8 Newtons down and if he is sitting quietly 1500* 9.8 N up from the ice on his frozen fur.
December 5, 2016

Like ALWAYS
Momentum after = Momentum before. Even when you get to relativity !
December 5, 2016

Science Physics
There is one thing you can really count on, Newton's First Law. If there is no external force on a system, the momentum remains CONSTANT Momentum before = Momentum after. If I could underline that PERIOD I would do so. You can not count on mechanical energy being the same ...
December 5, 2016

Math
w + L = 108 L = w + 30 so w + w + 30 = 108
December 4, 2016

physics
F = m a F = 3kg* 5m/s^2 = 15 Newtons a = F/m a = 15N/12.2kg a = 1.23 m/s^2
December 4, 2016

statistics
http://davidmlane.com/hyperstat/z_table.html
December 4, 2016

math double check please
yes, two 2s and a 3 yes, 420 * 3
December 4, 2016

pre calculus
http://www.jiskha.com/display.cgi?id=1480860809
December 4, 2016

Calculus
see the rope and the boat problem below.
December 4, 2016

Calculus
h height above bow (constant=7) y hor distance to bow (25 at moment) x = our rope length x^2 = h^2 + y^2 2 x dx = 0 + 2ydy dy/dx = x/y dy/dt = dy/dx dx/dt = 2 (x/y) x = sqrt (7^2 + 25^2) = 26 so dy/dt = 2 (26/25) = 2.08 m/s
December 4, 2016

Calculus
hint dA = 2 pi r dr so dA/dr = 2 pi r and dA/dt = dA/dr * dr/dt
December 4, 2016

PHYSICS (REALLY DIFFICULT PLEASE HELP)
18+273 = 291 K 0 + 273 = 273 K P V = n R T 103 * 23 = n R *291 n R = 103*23/291 same n R later 101 V = n R 273 V = n R (273/101cm^3) V = (103*23/291)(273/101) cm^3 22 cm^3 = .0022 Liters = 22*10^-6m^3 ================================== P V = n R T 101325 (22.4 liters)(1m^3/...
December 4, 2016

Sequence and serice
54/100 or 27/50 a rational number is any one that can be expressed as a ratio of whole numbers.
December 4, 2016

maths
2n + 24/6 = 25/6 n = 1/12
December 4, 2016

pre calculus
2 1 2 4 2 2 0 5 2-1 6 2 1 0 2 3/2 0 1-2 1 0 0 0 0 (3/2, 1, 0)
December 4, 2016

pre calculus
http://www.gregthatcher.com/Mathematics/GaussJordan.aspx
December 4, 2016

Maths
The diagonal sqrt(24^2 + 18^2)
December 4, 2016

Where are you stuck?
So what did you do?
December 3, 2016

Math
(1/2)(40 + 3/8) = 20 + 3/16 20 3/16
December 3, 2016

Math
2/12 = 1/6 24 * 1/6 = 4 or 12/24 = 2/x 12 x = 48 x = 4 or the original width was twice the length twice 2 is 4
December 3, 2016

Math
Then count the number of one inch by one inch square boxes. You will get 50 of them, 5 times 10 :)
December 3, 2016

Math
Because to find the area of a rectangle you multiply the length by the width. To figure out why, draw a picture 10 inches by 5 inches and divide it up into columns one inch wide and rows inch high.
December 3, 2016

Math
yes, multiply
December 3, 2016

CSC
(2s-44)+(s+22)+ s = 5858 4 s -22 = 5858 4 s = 5880 s = 1470 etc
December 3, 2016

Physics
vertical problem Vi = 25.8 sin 20 = 8.824 m/s v = Vi - 9.81 t at top v = 0 t = 8.824/9.81 = .900 seconds at top (therefore 1.8 seconds in air by the way) h = Vi t - (9.81/2) t^2 = 8.824(.9) - 4.9(.81) = 7.94 - 3.97 = 3.97 meters high horizontal problem u = 25.8 cos 20 = 24.2 ...
December 3, 2016

Math
multiplying by 5/2 should not give the same answer as multiplying by 2/5(which is dividing by 5/2)
December 3, 2016

Math
21 7/8 * 2 1/2 one way is to use distributive property (21 + 7/8)(2 + 1/2) =(2 + 1/2)(21) +(2 + 1/2)(7/8) = 42 + 21/2 + 7/4 + 7/16 = 42 + 168/16 + 28/16 + 7/16 = 42 + 203/16 = 42 + 12 + 11/16 = 54 11/16
December 3, 2016

Physics
yes,your table is for a = dv/dt = 4 so dv = 4 * dt dv/dt = a = 4 v = a t = 4 t x = (1/2) a t^2 t a v x 0 4 0 0 1 4 4 2 2 4 8 8 3 4 12 18 4 4 16 32 5 4 20 50 It is that v column you want, how far it moves PER SECOND not how far it moved total.
December 3, 2016

Physics
so dx/dt = a t dx = a t dt at t = 0, dx = 0 at t = 1, dx = a at t = 2, dx = 2a at t = 3, dx = 3a at t = 4, dx = 4a etc in other words you are looking at v(t), the velocity, which is linear with time (the CHANGE in position, not the position) v = a t the POSITION itself will be...
December 3, 2016

College Calc
sqrt 576 = 24 24*4 = 96
December 3, 2016

College Calc
LOL,square min P, given A A = L w so L = A/w P =2L+2w P = 2A/w + 2 w 2 w^2 - w P = -2 A w^2 -(P/2)w = A w^2 -P/2 w + P^2/16 = -A + P^2/16 (w-P/4)^2 = -(1/16)(16A-P^2) vertex when w = P/4 (that is a square :) Area = P^2/16 = (P/4)^2 of course P given, max A A = L w P =2L+2w so ...
December 3, 2016

Physics
R is speed of rain r is angle of rain to vertical horizontal rain we see = Rsinr+bike speed vertical rain we see = R cos r case 1 hor = R sin r + 20 ver = R cos r tan 45 = (R sin r +20) /Rcos r case 2 tan 19deg48 min = (R sinr +12)/R cos r
December 3, 2016

Algebra
It is as if she got 89 on 5 of the 6 tests! (89*5 + x)/6
December 3, 2016

Physics
http://formulas.tutorvista.com/physics/doppler-shift-formula.html
December 3, 2016

Physics
As the ambulance approaches, the pedestrian will hear a higher frequency. As it recedes a lower frequency. Add the absolute values of the changes. For the formula, Google Doppler shift (classical not relativistic)
December 3, 2016

chemistry
4/2 = 2 mols of CO2 for every mol of C2H6 mol of C2H6 = 2*12+6 = 30 g mol of CO2 = 12+32 = 44 g 7500 * 2 * 44/30
December 3, 2016

history knowledge
I guess I would have to go along with that but wonder if it would have lasted if he had lived. The last few years of scooting around the Middle East and western Asia did not seem to be aimed at establishing any sort of permanent government but rather putting people in titular ...
December 3, 2016

Physics
Fup = m (9.81 + v^2/R) 2*265 = 30 (9.81+v^2/1.4) (b) 2*265 up assuming the seat has no mass :)
December 3, 2016

Math
55% is Cu and FE so 45% is zinc .45 *720 = 324 grams That is assuming this is a MATH, not a Chemistry problem. If it were Chemistry they might be looking at 1/4 of the molecules are Cu, not 1/4 of the mass.
December 3, 2016

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

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