# Posts by Damon

Total # Posts: 31,586

World history
LOL, I guess you would not have a list of answer choices for this. In fact this requires at least a bookcase full of history texts and research papers and I am not sure how to do anything but point you to a few web sites. I guess start with the rivers (Tigris and Euphrates) ...

Math
-3 / (1/2) = -3(2/1) = -6/1 = -6

Maths
common multiple 5 2*2*2 2*2*3 need 5 2 2 2 3 120

Math
lol, square has at least 4 how many does a circle have ? ;)

Maths
alpha^.5 = [b +sqrt(b^2-4c)]/2 beta^.5 = [b -sqrt(b^2-4c)]/2 alpha =(1/4) [ b^2 +2bsqrt(b^2-4c)+b^2-4c] beta =(1/4) [ b^2 -2bsqrt(b^2-4c)+b^2-4c] alpha + beta = (1/4) [4 b^2 -8 c] = b^2 - 2 c etc ....

physics
10^4 km = 10^7 meters !!!! well the force on 1kg is the value of g there :) F = G * 1 * M /R^2 F =6.67*10^-11 * 6 *10^6 /(16*10^14) I think you probably have a typo

Math
-5 = -a+b-c dy/dx = 3 a x^2 + 2 b x + c = 4 at x = -1 so 3a - 2b + c = 4 d^2y/dx^2 = 0 = 6ax +2b = -6a+2b so b = 3 a 3 a -6a + c = 4 -5 = -a +3a -c -3a + c = +4 +2a - c = -5 ------------ 5 a = 9 etc check my arithmetic

Math Independent & Dependent.
the cost depends on how many c = 7 s http://nces.ed.gov/nceskids/help/user_guide/graph/variables.asp

Calculus unit review
draw a graph point A is (1/11) f(5) = f(1) + integral 1 to 5 (f' dx) = 11 + 9 = 20 or just say integral from 1 to 5 of (dy/dx) dx = y(5)-y(1)

Math
before x students 5x/8 boys and 3x/8 girls so later 3x/8 + 6 = 5x/8 3 x + 48 = 5 x 2 x = 48 so x = 24 students before x+6 = 30 after 6 girls arrived

how many minutes
hours = minutes/60 speed = 63 miles/those hours

math
1.20 x

Math
(7/8)(16/1) = 7*16/8 = 7*2 = 14

Math
hat is zero at -3, -3 , 2 ,2 , -5 the double roots mean the curve just touches the axis at: -3 and +2 when x is big positive, it is big positive when x is big negative it is big negative y = 180 when x = 0 so starts at lower left crosses x axis at x=-5 goes up then dips down ...

Physics
total energy is constant until it hits the ground. Potential turns to kinetic. m g h = 8 * 9.81 * 100 Joules

History
I am inclined to agree with you. See: http://en.wikipedia.org/wiki/Freedmen's_Bureau_bills although in practice it turned out more like B and even that was undermined by the KKK etc.

Math - limits
in radians sin t --> t + t^2/2! -t^3/3!..... so in radians sin t/t --->1 as t--->0 however we are doing degrees do t degrees which is (pi t/180) rad so we have sin (pi t/180) /t which becomes (pi t/180 +(pi t/180)^2/2 ... divided by t ----> pi/180 as t--->0...

Math
15/12 = 5/4

Math
agree

Math
1 / 3

math
Smith: 1 teen drinks 2/3 case / 5 weeks so 1 teen drinks 2/15 case / 1 week ===============================Jones 1 teen drinks 5/6 case / 4 weeks so 1 teen drinks 5/24 case / 1 week ======================== smith 2/15 jones 5/24 which is bigger? 15 = 3*5 24 = 3 * 8 3*8*5 = 120...

math
Once again 192 - 150 = 42 NOT 142

Social studies
ok :) Then I agree with you.

spelling ?
mass crowding maybe? If so yes.

error
192=k+54c............................. (1) 150=k+14c. ........................... (2) subtract (1) from (2) 142=40c ============================= whoops 42 not 142

physics
mg + mv^2/r = 1000 Newtons g = 9.81 m/s^2 v = 7.4 m/s r = 11.2 m solve for m

statistics
http://davidmlane.com/hyperstat/z_table.html

Physics
yes, true power = V i but V = i R so Power = i^2 R = V^2/R Joules per second or "Watts" Energy (or heat) = Power * time so indeed H = i^2 R t = V^2/R Joules Now how much heat do we need? H = mass * specific heat * change in temp H = 0.5 * 4.19*10^3 * 70 Joules so in ...

Science
x = sin (2 pi t/T) 1/2 = sin (2 pi t/24) 2 pi t/24 = pi/6 because pi/3 radians= 30 degrees and sin pi/6 = 1/2 t/12 = 1/6 t = 2

Math
L = 31.5 w = (4/7)31.5 = 18 p = 2 * 31.5 + 2 * 18 A = 31.5 * 18

Science
force = change in momentum/time 10 N = 10 kg *V / 10 s V = 10 m/s ============= or F = m a 10 = 10 a a = 1 m/s^2 v = a t v = 1*10 = 10 m/s

physics
v = a t 100 m/s = a ( 5 s) s = 20 m/s^2

Physics

Physics
weight in water = WW Newtons weight in air = WA Newtons mass = WA/9.81 kilograms (if your scale reads in kilograms, multiply by 9.81 m/s^2 on earth to get Newtons) difference = WA-WW = buoyant force = volume*density of water * 9.81 density of water = 1,000 kg/m^3 so difference...

algebra
typo maybe?

algebra
you have 0k so you can not solve for k

physics
a = dv/dt = 6.24 so v = constant + 6.24 t at t = 0, v = Vi so v = Vi + 6.24 t 9.36 = Vi + 6.24 * .44

Math
think ! 1. It starts in 1990 at 1,000,000 2. it DECREASES and you meant to the POWER t, not times t a k^t not a k t to check at 2010, t = 20 years y = 1,000,000* .98^20 ?

order does matter, typo by me
Write the number of permutations in factorial form, then simplify. How many differnet ways can you and four of your friends sit in the backseat of a limousine? A. 4!;24 b.4!120 C.5! 120 D. 5! 720 There are 5 of you. Order does matter so permutations of 5 taken 5 at a time 5! =...

PLLZ!PLLZ help with math quick!!!!!
Ariel wants to choose 5 players for her basketball team. There are 7 players to choose from.How many different teams can Ariel make? A. 21 B.32 c.42 D.56 =============================== combinations in grade seven? C(n,r) = n!/[r!(n-r)!] = 7!/[5!(2!)] = 7*6/2 =21...

Math
24 x^2 = 3*4.5 = 13.5 x^2 =13.5/24 so x^2 = .5625 feet^2 *144 in^2/ft^2 = 81 inches^2 so 9 inches on a side

Algebra
sketch graph at x = -oo it goes to -oo at x = -1 it is +6 at x = 0 it is-2 at x = +oo it is +oo SO it crosses the x axis three times, three real roots

Math PROBABILITY part 1
3/36 = 1/12 are less than 4 1,1 1,2 2,1 ================== IF you mean < or = 4 THEN 6/36 = 1/6

Math PROBABILITY part 1
1 though 6 horizontal and 1 - 6 verrtical chat 36 possible rools 9 have up two odd 9/36 = 1/4 so I bet B

Math PROBABILITY part 1
4/9 + 7/18 + x = 18/18 15/18 + x = 18/18 x = 3/18 = 1/6 which is a

Math PROBABILITY part 1
yes, 5/8 yes 4/9 next, problems

PHYSICS
1.3*.4 = .52 .7*.4 = .28 total distance = .8 total time = 1.1 av speed = .8/1.1 = .73 m/s

math plzzz help quick
You are welcome.

math plzzz help quick
2x = y-14 so -4x = -2(y-14) = -2y + 28 use that for -4x in equation 2 (-2y+28) - y = 4 -3 y = -24

physics
Vi = 14 a = -3.3 v = Vi + a t at stop, v = 0 0 = 14 - 3.3 t 3.3 t = 14 for half time if t = 7/3.3 v = 14 - 3.3 (7/3.3) v = 14 - 7 = 7 on the nose then

math plzzz help quick
rewrite first one x = y -11 use that for x in the second one y + 7 = -2(y-11) y + 7 = -2 y + 22 3 y = 15 y = 5

Algebra
divide by factor (x+2) (x^3 – 3x^2 – 6x + 8)/(x+2) = x^2-5x+4 which is (x-4)(x-1) so 4 and 1

electricity
15 = 60R/(60+R) 900 + 15 R = 60 R 45 R = 900

Physics
m v^2/R = 600 0.8 v^2/0.9 = 600

modern worl studies connexus
6 NO WAY!!! 9 Canada has its own monarch ??? First I heard of it, and I row against them up there in Nova Scotia.

math
4 works for 1, 4 or 4 people 6 works for 1, 2 , 3 or 6 people

math
READ That was the CHECK James is 48

math
Jo + 5 = Ja/3 Jo - 3 = Ja/6 -------------- subtract 0 + 8 = Ja(1/3 - 1/6) Ja (2/6-1/6) = 8 Ja = 6*8 = 48 =========================== check Ja = 48 Jo = 3 + Ja/6 = 3 + 8 = 11 then 11+5 = ??? 48/3 16 = 16 sure enough

need info
Please type entire problem. Without knowing the density of the logs or the mass of you and your friend, no way. call log density rho call g = 9.81 m/s^2 water density = 1000 kg/m^2 mass of passengers = m n = number of logs n * .13^2 *2.2 = V, needed volume of logs 1000 g V = B...

mechanics
F1 = f in x direction F2 = f cos 60 in x and f sin 60 in y total x = f +f cos 60 = 1.5 f total y = f sin 60 = [sqrt3/2]f magnitude of resultant = sqrt [ 1.5^2 f^2 + 3/4 f^2 ] = f sqrt [2.25 +.75 ] = f sqrt 3

Phycis
(1/2 )m v^2 + m g h = 1470 so Ke = 1470 - m(9.81)25 to get a numerical answer you need to know m

Physics
with constant acceleration a: v = Vi + a t x = Xi + Vi t + (1/2) a t^2 here Vi = Xi = 0 so x = (1/2)at^2

math
Fid = Fif + 26 Fif = R-12 so R = Fif+12 Fid + Fif + R = 71 Fif+26 + Fif + Fif+12 = 71

physics
2.2*10^4 = mg + ma =2150(9.81+a)

Calculus
http://www.jiskha.com/display.cgi?id=1486194050

value
75/3 = 25

distance ?
You have to know some distance in the problem. Otherwise you just have similar triangles of arbitrary size.

maths
well, go ahead. 30, 60, 90 triangle side opposite 30 = 5.6 sin 30 side opposite 60 = 5.6 sin 60

Calculus
tangent of angle above x axis = 35/42 magnitude = sqrt (42^2+35^2)

Math
0 to 9

Physics
F = G Mm m /Rm^2 F/m = G Mm/Rm^2 = 6.67×10-11 m^3 kg-1 s-2 * 1.08*10^16kg/[1.35*10^4]^2m^2

history
No way !

Math
4/-2 = -2 -2/-2 = 1 1/-2 = -1/2 (-1/2)/-2 = 1/4

math
(35/64)a = 2450 a = 2450*64 /35

Math : ratio and proportion
(2 L/80km) 1 km = 1/40 liter

Geometry
north wind due to boat speed at 16 kn west wind at 10.4 kn magnitude = sqrt(16^2+10.4^2) tan angle west of north = 10.4/16 compass angle= 360 - that angle

Math
5 * .0625 * 7150 = interest due total = interest due + 7150

Mathmaybe something like:s
7 , 8, 9 , 11 , 11, 11

MS. SUE! World History (Absolutism and Revolution)
The second one, Peter the Great's accomplishments,is correct. Do not forget he established a Russian port, called St. Petersburg, on the Baltic. I do not know much about Maria T. However from what little I know I would vote for #3.

History
http://www.britannica.com/event/United-States-presidential-election-of-1860

History
10 a is correct 3 see http://www.carolana.com/SC/1800s/antebellum/educational_opportunities.html 7. D is correct 8. http://www.geni.com/projects/Southern-Fire-Eaters/4715 9. Good grief, no slavery did not become legal in Massachusetts. However in theory after that decision, a ...

Maths
two years at 3% = .03*2 = .06 so .06 times original deposit = 72 so 72/.06 which is 1200

Maths
.06 v = £72

C
Sometimes: "Code of Ethics"

dynamics
v = -k ln x + c 15 = -k ln .6 + c 9 = -k ln 1.2+ c -----------------subtract 6 = -k ln(.6/1.2) etc

Math m1
600 = 400 a so a = 600/400 total force = 400 a + 1000 a = 1400 a

physics
and add heat of vaporization to steam

Geologic Time and Earth's History Unit Te
I would be happy to do it but need WhiteRain's text book.

ah --
hey - only the component in the k direction passes through your loop :)

set maths
You have to do this with a Venn diagram, which I can not really draw here but using that you should be able to figure it out.

So where is your attempt to do this? There are two common ways, I do not even know which you are using since I see no work.

History
1. agree 2. agree 3. agree 4. agree Hey, you know the answers perfectly well :)

Math--Matrix
http://matrixcalc.org/en/vectors.html

Math--Matrix
http://www.sosmath.com/matrix/eigen1/eigen1.html

physics
Newtonian Gravity, objects of mass M and n: F = force of attraction on each F = G m M/r^2 if M is earth mass, call it Me and r is earth radius, call it Re then G Me/Re^2 = 9.81 m/s^2 approximately so F = 9.81 m F/m we call acceleration of gravity on earth, g = about 9.81 If ...

physics
now F = m g work done against gravity = integral F*dr or m g dr or m * integral g dr m 9.8 Re^2 integral dr/r^2 from Re to 4 Re integral dx/x^2 = -1/x so here 1/6,400,000 - 1/25,600,000 = 1.17 * 10^-7 so work done in Joules - m 9.8 Re^2 * 1.17* 10^-7 = m (47,040,000) Joules ...

trick question
Although g may be about 9.8 m/s^2 at the surface of earth, it is not 9.8 at 4 Re and therefore you can not assume it is constant g = 9.8 (Re^2/r^2)

calculus
yes