Tuesday

September 23, 2014

September 23, 2014

Total # Posts: 18,627

**History**

How much does this machinery cost? Assuming money was borrowed from the bank to buy it all, how do the loan payments compare with the monthly payments to the bank for the farm land and the house and barn? Does the cost of this equipment force you to buy a much bigger farm than...
*August 5, 2014*

**Algebra**

149.25 = x - 0.25 x 149.25 = 0.75 x x = 149.25 / 0.75
*August 5, 2014*

**math hw**

20/60 = 1/3 of an hour distance = speed * time 160 miles = speed * (1/3) hour speed = 3 * 160 miles/hour = 480 miles/hour
*August 5, 2014*

**Pre Cal**

100 at 50 degrees counterclockwise from x 50 at 160 counterclockwise from x x component = 100 cos 50 + 50 cos 160 = 64.28 - 46.98 = 17.30 y component =100 sin 50 + 50 sin 160 = 76.60 + 17.10 = 93.70 magnitude = sqrt (17.30^2 + 93.70^2) angle = tan^-1 (93.70/17.30)
*August 5, 2014*

**Math**

You are welcome. Good luck !
*August 5, 2014*

**Math**

Here: http://www.purplemath.com/modules/mtrxmult.htm
*August 5, 2014*

**Math**

|24 -12| |0 +3 | |-18 -9|
*August 5, 2014*

**Math**

Well, if you multiply a matrix by a scalar, you multiply every element by the scalar
*August 5, 2014*

**Math**

Perhaps nothing. I need to figure out what the question is :)
*August 5, 2014*

**Math**

Oh like this? | -8 +4 | -3| +0 +3 | | +6 +3 | now does it want the product or -3 times the determinant I wonder ?
*August 5, 2014*

**Math**

Anyway --- go here : http://matrixcalc.org/en/
*August 5, 2014*

**Math**

can you describe it in words? is it a single matrix like | -8 +4 | | +0 +3 | | +6 +3 | and you want something about it ?
*August 5, 2014*

**Math ?????**

I have no idea what you are doing. Are those vectors or matrices or what ?
*August 5, 2014*

**Alegbra**

T >/= -6
*August 5, 2014*

**Alegbra - Ms Sue**

Ms Sue, negative divide changes arrow direction.
*August 5, 2014*

**Alegbra**

5 > 4 - 2 y 1 > -2 y divide by -2, when you multiply or divide by a negative, change direction of arrow - 1/2 < y so y > -1/2 now check that by picking some y which is greater than (to the right of on number line) -1/2 like maybe -1/4 8 - 3 > 4 - 2(-1/4) ???? 5...
*August 5, 2014*

**physics**

call north y and east x phase one: vx1 = 40.6 cos 25 vy1 = 40.6 sin 25 x1 = 40.6 cos 25 * 3 y1 = 40.6 sin 25 * 3 Phase 2 vx2 = 0 vy2 = 23 x2 = x1 + 0 * 7.4 y2 = y1 + 23 * 7.4 d = sqrt (x2^2 + y2^2)
*August 5, 2014*

**Physics**

50 meters plus whatever, find whatever v = Vi - 0.981 t v = 0 at max height so t = 30 m/s / 9.81 m/s^2 t = 3.06 seconds upward h = 50 + Vi t - 4.9 t^2 h = 50 + 30 (3.06) - 4.9 (3.06)^2
*August 5, 2014*

**Calculus-Math**

A = 2 (t+1)(t^.5) dA/dt = 2 [ (t+1)(.5 t^-.5) + t^.5 (1) ] = 2 [ .5 t^.5 +.5 t^-.5 + t^.5 ] = 2 [ 1.5 t^.5 + .5 t^-.5 ] = 3 sqrt t + 1/sqrt t = (3 t + 1 )/sqrt t
*August 5, 2014*

**Math**

10/12 + 9/12 = 19/12
*August 5, 2014*

**Geometry**

I am not sure how to do a two column proof of this. If the word "image" or "model" implies similarity, then it is just a one line proof; if it is a valid image, then the model and the bicycle are similar. (angles are the same and lengths are proportional.)
*August 5, 2014*

**Geometry**

If corresponding angles are the same and if all corresponding lengths are in the same ratio then the images are similar.
*August 5, 2014*

**Geometry**

The image is similar (in the geometrical sense) to the original. Therefore if any length on one image is 9 times its length on the other image, then all lengths are in that ratio. Use any length, for example the diameter of the front wheel on each image :)
*August 5, 2014*

**Economics**

Nope
*August 5, 2014*

**economics**

1. costs money, employs bureaucrats 2. keeps people alive, employs bureaucrats
*August 5, 2014*

**Afrikaaans**

Ik ken een beetje Nederlands en ik versta je wel, maar wat heb je nodig? Wij kunnen een essay over je school niet schrijven. Ik weet niets over je school.
*August 5, 2014*

**geometry**

did you leave out the 3 120s that go with the three 50 s ?
*August 5, 2014*

**geometry**

the exterior angles have to sum to 360, all the way around with exterior of 50 we have exterior of 150 so far and 360 - 150 = 210 left for exterior angles exterior with 127 interior = 53 exterior with 135 = 45 so 210 - 53 - 45 = 112 left for exteriors exterior with 173 = 180-...
*August 5, 2014*

**typo ?**

4000 meters / second maybe? Newton #2: Force = change in momentum / time (F= m a if m is constant but here it is not) change in momentum/second = [.050 kg * (4000 - 0) m/s]/second = 200 Newtons
*August 5, 2014*

**History**

The farmers got caught in a cycle of debt because it says they did not have capital to buy land and therefore I suspect they had to borrow.
*August 5, 2014*

**physical**

LOL !!! This is a trick question. You know the answer. It is exactly the same as throwing a ball straight up. It takes just as long to go up (0 = Vi - g t) so t = Vi/g h = Vi t - (1/2) g t^2 as it takes to go down 0 = h - (1/2) g t^2 = Vi t - (1/2) g t^2 - (1/2) g t^2 t = Vi...
*August 5, 2014*

**English/ Help**

Now what about A? Who misunderstood what? Did they think he was Darth Vader when he was actually Luke S? Now what about B? Was there milling around and people stepping on others' toes trying to get selfies and autographs? Now what about C? Who left. I might have but I was ...
*August 5, 2014*

**English/ Help**

http://www.jiskha.com/display.cgi?id=1407196486
*August 5, 2014*

**English/ Help**

Could swear I have seen this question before.
*August 5, 2014*

**college physics**

omega = initial omega + alpha * t if alpha is constant and it starts from rest t = omega/alpha
*August 5, 2014*

**math**

C = 9000 + 21 x yes Revenue = R = 49 x P = 49 x - 21 x - 9000 so P = 28 x - 9000 now for some reason they did not asdk how ma tires must be sold to break even but it would be P = 0 28 x = 9000 x = 9000/28
*August 4, 2014*

**Algebra**

Your notation is extremely awkward. We normally write x to a power as x^power like x^3 is x cubed Now I will do it your way but you have errors starting with the sign in the first line x(2x squared-x-3)+ 1(2x squared-x-3) should be x(2x squared-x-3) - 1(2x squared-x-3) then x*...
*August 4, 2014*

**Algebra**

again: http://www.jiskha.com/display.cgi?id=1407198511
*August 4, 2014*

**Algebra**

Did I not just do that ?
*August 4, 2014*

**English/ Help**

hmmmm ..... each pointed to their records of service and academic excellence.
*August 4, 2014*

**Pre-College Algebra**

distributive property: x * (2x^2 - x- 3) -1* (2x^2 - x- 3) = 2 x^3 - x^2 - 3 x - 2 x^2 + x + 3 combine like terms = 2 x^3 - 3 x^2 - 2 x + 3
*August 4, 2014*

**math test review**

h^2 + 64(2) = 18^2 = 324 h^2 = 196 h = 14 area = (1/2)(8sqrt 2)(14) =56 sqrt 2
*August 4, 2014*

**Physics**

You are welcome.
*August 4, 2014*

**Physics**

Stand on a scale and push on the ceiling :) Third law. Force by man up on bars --> force down on man Sum forces on the man who is not accelerating up or down m g down + handlebar force down force up on man = pedal force net force = 0 so no change of momentum (F = m a = 0) ...
*August 4, 2014*

**English/ Help**

I agree with you but I was a physics major :) C and D are just plain wrong. The car, not the fuel efficiency, is designed :)
*August 4, 2014*

**math hw**

all multiples of 6 are even and multiples of 3 Venn diagram (intersection is mult of 6) n are multiples of 6 22 - n are even only 15 - n are 3 only (22- n) + n + (15-n) = 30 37 - n = 30 n = 7
*August 4, 2014*

**math hw**

Hey (a^2-b^2)= (a+b)(a-b) remember forever (a+b)(a-b) = 20 2(a-b) = 20 a - b = 10
*August 4, 2014*

**math**

g = 2 b - 5 so yes, but they said b for boys
*August 4, 2014*

**physics**

You also need specific heat of iron and melting point Watch your units, grams or kg , Joules or calories to get up to Tmelt heat = 1000 g * specific heat iron in Joules/gram deg C *(Tm-20) to melt heat = 1000g * 33 J/g
*August 4, 2014*

**Calculus**

y = x^.5 y' = .5 x^-.5 sketching this I am going to reverse slope equation y' at tangent = m = (y-yo) /( x-xo) = .5x^-.5 y' = m = (y-0)/(x+16) = .5 x^-.5 x^.5 /(x+16) = .5 x^-.5 x/(x+16) = .5 x = .5 x + 8 .5 x = 8 x = 16 so the tangent hits the curve at x = 16 ...
*August 4, 2014*

**physics**

do vertical problem find Vi, initial speed up Vi = 65.2 sin 34.5 find t where v = 0, top of curve v = Vi - 9.81 t 0 = Vi - 9.81 t solve for t, time at top, half the time in the air max height h = 0 + Vi t - 4.9 t^2 now horizontal problem u = 65.2 * cos 34.5 the whole time ...
*August 4, 2014*

**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*

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