Tuesday
September 23, 2014

Posts by Damon


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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