Friday

August 22, 2014

August 22, 2014

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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