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Posts by Damon

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where is M?
if m is at the center then diagonal = 2(5x+1) which is the same as the other diagonal 42 5x+1 = 21 5x = 20 x = 4
December 6, 2016

same question
as below
December 6, 2016

College Math
about .5 https://en.wikipedia.org/wiki/Birthday_problem 1 - [(1/365)^41 (364*363*362....324)]
December 5, 2016

Calculus
side = x height = y volume = x^2y = 4000 so y = 4000/x^2 area = A = x^2 + 4 x y A = x^2 + 4 x (4000/x^2) A = x^2 + 16000/x min or max when dA/dx = 0 0 = 2x -16000/x^2 16000 = 2 x^3 x^3 = 16000 x = 25.2 y = 4000/x^2 = 6.3
December 5, 2016

Science
radiation primarily from sun
December 5, 2016

math
-8 is to the left of +10 on your number line is it not? Therefore -8 < +10
December 5, 2016

Calculus
cos x dx = e^y dy dy/dx = cos x /e^y but e^y = sin x so dy/dx = cos x / sin x = cot x
December 5, 2016

Algebra
how about we multiply the entire equation 1/p+1/(p-45) = 1/30 by 30p(p-45) 30(p-45) +30p = p(p-45) 30 p - 1350 + 30 p = p^2 -45 p p^2 -(45+30+30)p + 1350 = 0 p^2 - 105 p + 1350 = 0
December 5, 2016

Algebra
y^2 = 16 x
December 5, 2016

not doing them all
This is just a reverse of your last problem with different numbers
December 5, 2016

now wait a minute
I have showed you how to do these. speed = sqrt (T/u) u = mass/length distance for wave to travel in one period = 2L (because half a wave is fundamental) T = distance/speed frequency = 1/T
December 5, 2016

physics last one
speed of sound there? Call it v (maybe around 350 m/s) goes twice L 2 L = v T = 2.2 v L = 1.1 v
December 5, 2016

Algebra
p(x) is a parabola opening down(sheds water) therefore the vertex is at the top p So use complete square to find vertex (if you do not know any calculus) -10 x^2 + 100 x = p + 210 x^2 - 10 x = - (1/10)(p+210) x^2 - 10 x + 25= -(1/10)(p+210)+25 (x-5)^2 = -(1/10)(p+210-250) x = ...
December 5, 2016

physics
string length = 0.97 meter m = 0.0036 kg u = mass/length = .00371 half a wavelength = 0.61 meter speed = sqrt (570/.0031) = 429 m/s time to go half a wavelength = .61/429 = .00142 seconds time for a wavelength = .00284 s f = 1/time = 351 Hz
December 5, 2016

physics
mass/unit length = .73/31 = .0235kg/m speed = sqrt (T/u) where T = tension in Newtons which is kg m/s^2 and u is mass per unit length in kg/m so speed = sqrt (1100/.0235) = 216 m/s time = distance/speed = 31/216 = .143 s looks like piano wire :)
December 5, 2016

Math
8 quarts [1 drink/ (1/4 quarts)] = 8 * 4/1 = 32 drinks
December 5, 2016

Huh?
You are asking some old retired professor who has no idea what your test is about? Perhaps you better post one of the thirty questions and tell us what about it you are having trouble with or do you just want me to do it for you? Why would I do that?
December 5, 2016

MATH
3 a = 5 so a = 5/3 4a - 5 = 20/3 - 5 = 20/3 - 15/3 = 5/3
December 5, 2016

math
145 + 2.4*145 -58 = 435 145/435 = .3333
December 5, 2016

math
(Agree with Coolmath )
December 5, 2016

math
clara raised x ali raised 1.2 x shan raised 1.2 x - 58 x = 5/4 (1.2 x - 58) 4 x = 6 x - 290 2 x = 290 x = 145 now you do the rest
December 5, 2016

PLEASE HELP SOCIAL STUDIES CONNECTIONS ACDEMY 6th
yes
December 5, 2016

PLEASE HELP SOCIAL STUDIES CONNECTIONS ACDEMY 6th
arrrgggghhhh Read Reed!
December 5, 2016

math check my answers please
agree agree
December 5, 2016

Math
You are welcome.
December 5, 2016

Math
then my guess is my answer, about 2500, B
December 5, 2016

typo?
no way it is 1010 feet wide assuming you mean about 10 feet and d is 80.8 (or is it 808 ?) surely not a mile and a half pi d = about 3*81 = about250 pi d* 10 = about 2500
December 5, 2016

math
x yellow 12 - x green first draw x/12 second draw (x-1)/11 so both (x^2-x)/132 = 5/33 33(x^2-x) = 660 x^2 - x - 20 = 0 (x-5)(x+4) = 0 x = 5 because it is hard to visualize a negative yellow marble
December 5, 2016

math
brown, 9 x black, 4 x white, 8 x = 16 so x = 2 18 + 8 + 16
December 5, 2016

Calculus applications
Now you want the max moment and where the moment will be max where its derivative, the shear, is zero S = w (L/2 - x) = 0 so the moment is max where x = L/2, the middle of course How much is it? M = w (L^2/4 -L^2/8) = wL^2/8 which is wl (L/8) which is the weight * L/8
December 5, 2016

Calculuhttp://www.jiskha.com/display.cgi?id=1480944543s applications
Calculus applications - Damon, Monday, December 5, 2016 at 9:24am 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...
December 5, 2016

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

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