Friday
August 22, 2014

Posts by Damon


Total # Posts: 17,977

English/ Help
Unfortunately copy and paste does not work here and I do not see the original sentence.
August 4, 2014

Math
If you have not had FOIL, use distributive property v(v+3) - 5(v+3) = v^2 + 3 v - 5 v - 15 = v^2 - 2 v - 15 FOIL is for doing these First, Outer, Inner, Last v*v + v*3 - 5*v - 5*3
August 4, 2014

Math 221
no anything to the -3 is one over anything^3 so 1/(-4)^3 1/[ -4*-4*-4 ] 1/ -64 -1/64
August 4, 2014

Math 221
when you have more than one term in a numerator or denominator, put a parenthesis around them a + b/c is just that , a alone plus b/c but (a+b) / c is a+b ----- c or a/c + b/c
August 4, 2014

Math 221
Go with my original reply then. I had a hunch that was the case because both 24 and 15 were divisible by 3.
August 4, 2014

Math 221
ok if you really mean that. I had a hunch it looked like 24x^5-15x^4 ------------ 3x^2 but if you really mean 24 x^5 - (15 x^4/3 x^2) then 24 x^5 - 5 x^2
August 4, 2014

Math 221
Be careful with numerators and denominators and parentheses What you wrote is 24x^5- (15x^4/3x^2) but I bet what you mean is (24x^5-15x^4)/3x^2 which is 24x^5/3x^2 - 15x^4/3x^2 or 8 x^3 - 5 x^2
August 4, 2014

POL201
hmmm, around here unfunded means unfunded :)
August 4, 2014

Math
Yes !!! Great :)
August 4, 2014

English/ Help
Yes, I am the first person You are the second person see: http://www.quickanddirtytips.com/education/grammar/first-second-and-third-person?page=1
August 4, 2014

math
(a) i(x) = .04 x + .0475 (29,000 - x) = 1377.50 - .0075 x (b) 1332.50 = 1377.50 - .0075 x
August 4, 2014

Math
Just add like terms 4 u^2 - 5 u^2 plus -2 u + 1 u plus 7 + 3 = - u^2 - u + 10
August 4, 2014

Math
You are welcome poly means more than one or many in general
August 4, 2014

Math
although a polynomial normally has more than one term for example x^2 + 2 x + y + y^3 .........
August 4, 2014

Math
yes :)
August 4, 2014

Math
Then to raise one power to another see: http://mathsfirst.massey.ac.nz/Algebra/Exponents/IntegerExp/RaisePower.htm
August 4, 2014

Math
Here is a link to instructions: http://www.mathsisfun.com/algebra/variables-exponents-multiply.html
August 4, 2014

Math
Again I will assume you mean: (-2x^4)^2 / y -2 *-2 = + 4 x^4 * x^4 = x^8 so 4 x^8 / y which is the same as 4 x^8 y^-1
August 4, 2014

pol week 2 quiz
I would have to Google some of that !
August 4, 2014

math plz ugh
huh - no work required y = -(3/4)x - 5
August 3, 2014

math
sketch it. y = -8
August 3, 2014

math help plz!
7 y = 3 x - 9 so y = (3/7) x - (9/7) m = slope = 3/7 b = y axis intercept when x = 0 = -9/7
August 3, 2014

Physics
There is no horizontal force. Therefore there is no change in the horizontal component of velocity.
August 3, 2014

statistics
http://davidmlane.com/hyperstat/z_table.html
August 3, 2014

math
pi y^2 dx from -1 to +1 same as 2 pi y^2 dx from 0 to 1 2 pi (1-2 x^2 + x^4) dx from 0 to 1 2 pi (1-0) - 4 pi (1^3/3-0) + 2 pi (1^5/5-0) 2 pi - 4 pi/3 + 2 pi/5 (pi/15) ( 30 - 20 + 6) (16/15) pi Check my arithmetic !
August 3, 2014

Calc BC
http://www.jiskha.com/display.cgi?id=1406849570
August 3, 2014

Trigonometry
Yes, right triangle, 7 is hypotenuse, h is opposite the 50 degrees
August 2, 2014

Trigonometry
I drew a sketch Between the steep slope (65 degrees) and horizontal outside it is 180 - 65 = 115 then up at the top of the outside triangle 180 - 115 - 50 = 15
August 2, 2014

Trigonometry
You are welcome.
August 2, 2014

Trigonometry
b) outside triangle is 50, 115 and 15 so sin 15/2 = sin 115/a a = 7 (long slant side) then sin 50 = h/7 h = 5.36
August 2, 2014

Trigonometry
a) angle up at top = 180 - 65 - 50 = 65 oh, my, this is an isosceles triangle, interesting anyway let's find the other two sides for fun sin 50/a = sin 65/2 a = 2 sin 50/sin 65 = 1.69 and b = 2 sin 65/sin 65 = 2 obviously sin 65 = h/1.77 h = 1.69 sin 65 = 1.53 or ...
August 2, 2014

math
1/3 = b/a so a/b = 3/1 which is 3
August 2, 2014

teacing in early childhood programs
Knowing nothing about the subject, I would go with a.
August 2, 2014

Physics
There are no horizontal forces here! NONE!!! Nada ! Zilch ! THEREFORE there is no horizontal acceleration ! Therefore there is no rate of change of horizontal velocity component ! Therefore the answer to this silly trick question is that there is no change in the horizontal ...
August 2, 2014

Physics
first c It passes 11 meters on the way up and on the way down. now the calculations I guess it started at h = 0 (we are lying on our backs in a shallow hole throwing this upward ) Vi = 18 a = -9.81 m/s^2 = g initial Ke = (1/2) m v^2 = 162 m loss of Ke at 11 meters = m g h = ...
August 2, 2014

Physics
C = q/V q = C V i = -dq/dt = -C dV/dt so dV/dt = -i/C V = i R = 4.5 * 10^5 i so i = .222 * 10^-5 V = 2.22*10^-6 V then combine dV/dt = -(1/c)(2.22*10^-6 V) dV/V = -(2.22/49) dt ln V = -.0453 t + constant V = Vi e^-.0453 t . 75 = e^-.0453 t ln .75 = - .288 = - .0453 t t = 6.35 ...
August 1, 2014

Physics
The charge on each is the same. The voltage on each is half the battery = 8.3 volts C = q/V C = .88 *10^-6 /8.3
August 1, 2014

Chemistry / help
Think !!! Which of those expands to fill a bigger bottle?
July 31, 2014

physics
assume you mean 10^3 100 ( 1.50/ 4.32 )
July 31, 2014

physics
look at the question below this one v^2 = 2 g h
July 31, 2014

physics
45 g has nothing to do with this because m cancels (1/2) m v^2 = m g h v^2 = 2 g h v = sqrt (2 g h) [ worth remembering ]
July 31, 2014

physics
assume you mean 10^3 v = 22.5 km/hr (1 hr/3600 s)(1000 m/km) answer = (1/2)(82)(v^2) Joules
July 31, 2014

AP Calc
when x = 0, middle, y = e^0 + e^-0 = 2 when x = 2 or -2 (end) y = e^2 + 1/e^2 = 7.524 so parabola has vertex at (0, 2) and goes through (-2, 7.524 ) and (-2,7.524) we might as well move this down weo so the vertex is at the origin vertex at (0,0) and (2, 5.524) and (-2, 5.524...
July 31, 2014

physics
The same way we did the one below
July 31, 2014

physics
.6 kg * 9.81 m/s^2 * 0.75 m
July 31, 2014

physics
d = Vi t + (1/2) a t^2 450 = 9.6 t + 2.1 t^2 solve quadratic for t then v = Vi + a t v = 9.6 + 4.2 t
July 31, 2014

physics
force * distance in direction of force = 57.5 * 9.81 * 1.25 = 705 Joules = 0.705 kJ the rest of the 2.25 kJ is lost to heat and his own motion
July 31, 2014

physics
v = Vi + a t 28.5 = 0 + 3.70 t
July 31, 2014

physics
assume start from rest v = Vi + a t v = 0 + 3 * 10 which is 30 m/s
July 31, 2014

physics
distance = 820 + 600 time = 10.3 * 60 + 3.8 * 60 average speed = distance / time
July 31, 2014

Mathh
total cards = 110 + 75 + 315 gave away = 110 + 75 percent given = 100 (110+75)/(110+75+315)
July 31, 2014

physics
20 * 9.81 * .7 no work is done carrying. Force is not in direction of motion
July 31, 2014

physics
Vi - 8 t like DROSP said
July 31, 2014

physics
I might do it in m/s though .14 / 180 = 7.77 * 10^-4 m/s = .000777 m/s
July 31, 2014

physics
1 km/min = 60 km/hr
July 31, 2014

physics
water mills and wind mills ?
July 31, 2014

physics
5350 /(5350 + 600) multiply by 100 if you want percent
July 31, 2014

math
First one, roll 6 times p is a two = 1/2 p not a two = 1/2 p a two one out six rolls = (6,1) (6!)/[(1)!(5!)] (1/2)^1(1/2)^5 = 6 (1/2)^6 Second one p is a two = 2/3 p not a two = 1/3 p a two one out of 6 rolls = 6 (2/3)^1 (1/3)^5 = 6 (2)/3^6 P second one / p first one = 2/3^6 /...
July 31, 2014

physics
A (1/2) m v^2 B (1/2)(18m)v^2/9 B/A = twice
July 31, 2014

physics
Jill (1/2) m (100/15)^2 Jon (1/2) m (100/30)^2 Jill/Jon = 30^2/15^2 = 4 Jill's ke = 4 time Jon's
July 31, 2014

physics
10 cm * 1 meter/100 cm = 0.1 meters 120 * .1 = 12 Joules
July 31, 2014

physics
1*9.78 - 5 Does it really say g = 9.78 m/s and not g = 9.81 m/s^2 ???????
July 31, 2014

physics
Francis, read and punch calculator. He gave you the answer.
July 31, 2014

math
4 sqrt 6 ---------- sqrt (6*5) = 4/sqrt 5 * sqrt 5/sqrt 5 = (4/5) sqrt 5
July 30, 2014

PreCalculus
If the events are independent, you multiply the probabilities. For example that would not apply to falling and getting eaten by the shark BECAUSE you were hit by lightning or the ship sank but only as independent events.
July 30, 2014

physics
2.74 + 3.19 cos 61.2
July 30, 2014

Math
Mike (1/60) project/min Walter (w project/min) together (1 + 60 w)/60 project /min [(1+60 w)/60 ] 40 = 1 project 1 + 60 w = 6/4 60 w = .5 w = .0083333 1/w = min/project = 120 minutes
July 30, 2014

ALGEBRA
L = w + 3 (L+2)(w+2) = 70 + (L)(w) (w+5)(w+2) = 70 + (w+3)(w) w^2 + 7 w + 10 = 70 + w^2 + 3 w 4 w - 60 = 0 w = 15 L = w+3 = 18
July 30, 2014

ALGEBRA
approach speed = v + v+60 = 2 v+60 d = rate * time = (2v+60)(5) = 10 v + 300 unfortunately we were not given d, their distance apart so I am faced with a problem or a typo.
July 30, 2014

maths
Republican and Tea Party ?
July 30, 2014

Math
(100 pages / h hours) (1 hour/60 min) = (100/60 h) pages/min * m minutes = (100 m /60 h) Probably C but if so you have a typo
July 30, 2014

calculus 2
y = x^(1/3) ????? h = (6-1)/10 = . x____________ y 1____________ 1 1.5 _________ 1.145 2____________ 1.260 2.5__________ 1.357 3 etc etc etc 3.5 4 4.5 5 5.5 6 integral is about (.5/3)(y0+4y1+2y2+4y3 +2y4 ......+1y10)
July 29, 2014

Physics
Normal force = m g cos 30 max friction force = mu m g cos 30 power in = power out P = (mu m g cos 30) v
July 28, 2014

Physics -- check answers please
yes yes
July 28, 2014

Physics
-4 F (opposite charges attract)
July 28, 2014

pharmacy
huh? .930/3 = 0.310 mg
July 28, 2014

Calculus
easy way: r = (4/16) h = (1/4) h surface area = pi r^2 = pi (1/16) h^2 dV = surface area * dh dV = pi (1/16) h^2 dh DV/dt = (1/16) pi h^2 dh/dt hard way: V = (pi/3) r^2 h given again r^2 = (1/16) h^2 V = (pi/3)(1/16) h^3 dV/dh = (pi/16) h^2 again dV/dt = (pi/16) h^2 dh/dt
July 27, 2014

math
speed = s current = c s + c = 17.2 s - c = 10.4 ------------ add 2 s = 27.6 etc.
July 27, 2014

Math
Those are both straight lines, graph them. x - 3 y= 10 goes through (0,-10/3) and (10,0) we are on that line and left of it 3 x - 2y = 5 goes through (0,-2.5 ) and (5/3 , 0) we are on that line and below it where do they hit? 3 x - 9 y = 30 3 x - 2 y = 5 ------------------ -7 ...
July 27, 2014

Physics 2
speed of light is about 3 * 10^8 meters/ second by the way
July 27, 2014

physics
diffraction grating again
July 27, 2014

physics
y = m lambda D/d d bigger means y smaller
July 27, 2014

physics
less distance ---> more friction, more retarding force
July 27, 2014

physics
momentum before = 2 *.28 momentm after = 2 v + .5 * 1.5 .56 = 2 v + .75 2 v = -.19 v = - .095 (The Answer :) Now by the way is this possible? initial kinetic energy = (1/2)2 (.28)^2 = .0784 Joules final Ke = (1/2)(2)(-.095)^2 + (1/2)(.5)(2.25) = .009025 + .5625 = .5715 Joules ...
July 27, 2014

calculus 2
odd function from -3 to + 3 ---> 0 I suspect
July 26, 2014

Algebra
60 = L + 2 w so L = 60 -2 w A = L w A = (60-2 w)w = 60 w - 2 w^2 If you know calculus, just take derivative and set to zero and you are done If not, complete the square to find vertex of parabola. w^2 - 30 w = -A/2 w^2 - 30 w + 225 = -A/2 + 225 (w-15)^2 = -(1/2)(A - 450) so w...
July 26, 2014

Physics
When a wave travels from fast to slow medium: Reflected wave is inverted. (crest -reflected as trough is 180 deg phase shift)
July 26, 2014

Algebra
Sketch those lines slopes of +/- 1 center axis halfway between 1 and 5 so at y = 3 the lines cross at (2,3), so that is center of hyperbola so (x-2)^2/a^2 - (y-3)^2/b^2 = 1 slopes of asymptotes = +/- b/a so b = a (x-2)^2/a^2 - (y-3)^2/a^2 = 1 put that point in now (4-2)^2/a^2...
July 26, 2014

Physics -- check answers please
1. ok 2. We used to use a "diffraction grating" in the spectroscopy lab to get the clearest pattern.
July 26, 2014

Calc
Oh, sorry, I thought you meant just the length of that splitting fence.
July 25, 2014

Calc
.000000000000001 feet or perhaps the length of the width of a cow. :) The problem does not make much sense as stated. You could make the field extremely longs and not at all wide and divide it with a little fence in the middle the length of your very short ends.
July 25, 2014

algebra 1
well, do part B and you will have the answer to part A 100 - 1.9 = 98.1 percent so every time we go a meter, we multiply by .981 after x meters f(x) = 1700 * .981^x (Part B answer) which is exponential, not linear. (part A answer) It does not lose a constant "amount"...
July 25, 2014

Calculus: Determine the constants from function
dh/dx = 0 at critical points dh/dx = 3 x^2 + 2 b x = 0 x (3x+2b) = 0 so at (2,4), 3x+2b = 0 = 6 + 2b so b = -3 so h = x^3 -3 x^2 + d at x = 2, h = -4 -4 = 8 - 12 + d d = 0 so h = x^3 -3 x^2
July 25, 2014

College Algebra
^4t not to the t/4 1.01875^4t = 7200 4 t = log 7200/log 1.01875 t = 120 years
July 25, 2014

Math 221
That is: https://www.khanacademy.org/math/linear-algebra/vectors_and_spaces/vectors/v/linear-algebra--parametric-representations-of-lines
July 25, 2014

Math 221
Your talk of origins does not make a lot of sense to me since the origin is at (0,0) for all your problems. However perhaps your class is trying to work toward a vector version of this material where you specify a point and move out from there at a certain slope. In that case ...
July 25, 2014

Math 221
If y = x + 8 the x axis intercept for that is when y = 0 0 = x + 8 x = -8 so (-8,0) the y axis intercept for that is when x = 0 which is b in y = m x + b so 8 so at (0, 8) --------------------------------------- I thought I did that other one too. This time you did the problem...
July 25, 2014

Math 221
Go back, I just saw this below and replied. http://www.jiskha.com/display.cgi?id=1406309814
July 25, 2014

MAth
10 y^2 - 15 y + 2 y - 3 or 10 y^2 - 13 y - 3
July 25, 2014

Physics
I do not have your figure. HOWEVER (Note - I do not care what mass it is, call it m not 200 until part c) initial kinetic energy = (1/2)m(100) = 50 m Ke at any height h = 50 m + m g (100-h) so at any height h (Points A B and C) (1/2) m v^2 = 50 m + m g (100-h) note m cancels) ...
July 25, 2014

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