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Posts by Damon

Total # Posts: 29,750

pre calc
top = L^2 bottom = L^2 4 sides = 4*13L total = 2 L^2 + 52 L

algebra
Good ! You are welcome.

algebra
no, look below carefully 3.2*10^2 LY ( 5.88*10^12 mi/LY) = 18.8 * 10^14 mi = 1.88 * 10^15 mi

easy algebra question, check answer
yes 3*10^1 * 3*10^5 = 9*10^6 because x^a * x^b = x^(a+b)

can not help
Since I do not know what it looks like. You can not copy and paste here.

Math
4*10 = 40 10 * 10 = 100 so eleven, but the raft only holds ten :)

Social Studies
You are welcome.

Social Studies
Well, I would have picked A, although I would put it much more strongly. The Soviet Union effectively took absolute control of countries like Poland, Czechoslovakia, Hungary, East Germany ..... Google "Winston Churchill Iron Curtain speech"

Ms Sue?
We are volunteers, for the most part teachers, who are happy to help students, but not to do tests for you. Force = rate of change of momentum = d/dt (m v) if m is constant ( no mass change due to exhaust or fast fuel use or what ever) then: F = m dv/dt F = m a where a is ...

Physics
40*9.81*.4 = work done power = work /second so P = 40 * 9.81 * .4/.5 = 314 Watts if you used 10 m/s^2 for g you would get C

Physics
25 * 200 = v * 900 v = 5.55 so yes, A

do not see pictures
If you tried to post diagrams, that does not work here.

Science
1 = 10 log P/Po where log is base 10 0.1 = log P/Po 10^.1 = P/Po P/Po = 1.259

Math
You are welcome.

Math
steps >/= 10,000 - 5,274

Physics 202
for rock: T = 2 pi sqrt (L/g) T = 2 pi sqrt (.5/g) for ball Tb = 5 T so 5 T = 2 pi sqrt (Lb/g) =================== 10pi sqrt (.5/g) = 2pi sqrt (Lb/g) 5 sqrt (.5) = sqrt(Lb) 25 (.5) = Lb Lb = 12.5

Math
dR/dx = 1500 - 3000*2/(2x+3)^2 if x = 150 dR/dx = 1500 - 6000/303^2 = $1499.93 per unit the point is that you have an initial 1000 setup cost then it is $1500 per unit but that decreases as the number goes up and you train robots

maths fractions
1/4 = 3/12 1/3 = 4/12 x/12 - 3/12 = 4/12 x/12 = 7/12

20/15 in lowest terms.Express your answer mixed n
sorry 1 1/3

20/15 in lowest terms.Express your answer mixed n
divide top and bottom by 5 4/3 = 3/3 + 1/3 = 3+1/3 = 3 1/3

Math
6 out of 20 do not like it. 6/20 = 30/100 or 30%

mathematical literacy
2 of cement 2 of lime 2*5 = 10 of sand 2 of water

history please help! Check my answers!
Flowers are major, and are only in the third choice, so yes, right.

math
ah 40,000 (1.07)^2

math
h = 9 - (x+3)^2 = 9 - x^2 -6 x - 9 = -x^2 - 6x slope = dh/dx = -2x -6 zero when x = -3 curvature = d^2h/dx^2 = -2 so that is a maximum then what is h? -x^2 - 6 x = -x (x+6) when x = -3 3 (3) = 9 which we could have said in the beginning because x^2 is always + so 9-x^2 is ...

PHYSICS
u = 1.12 forever Vi =initial vertical velocity = 0 v = Vi - 9.81 t h = Hi + Vi t - 4.9 t^2 h = 27.8 - 4.9 t^2 0 = 27.8 - 4.9 t^2 so t = sqrt (27.8/4.9) use that t to get horizontal range x = 1.12 t

physics
t cos 52 = (24/2)9.81 = 12*9.81

History - please check my answers
1. I would include the check on gov power 2. The First amendment is about Congress NOT MAKING A LAW ABRIDGING the right of the people peaceably to assemble. I am not aware of anything about public versus private property in the First Amendment, although there is case law on ...

calculus
64 = (4/3)pi R^3 from that find R dV = surface area * dR (easy way :) so dV/dt = 4 pi R^2 dR/dt 20 in^3/min = 4 pi R^2 dR/dt solve for dR/dt

Calculus review
arc tan t where t = x^2 so arc tan x^2 (it is how fast the area is changing at the right side of the area, the high limit of t)

Geometry
Diameter = 4' radius = 2' = 24 inches Area = pi r^2 = 576 pi in^2

Math
r+4 = 2(a+4) or r - 2a = 4 You need to know something more.

maths
(5/8)(152) = 5*19 = 95

Physics
does the water just stop or continue moving with the child? it it continues moving on the child for an instant, you have 90 kg, not 30

Math
Do + Da = 41 Do + 5 = 2(Da+5) 41 - Da + 5 = 2 Da + 10 etc

Math
LOL, subtract 3 from the answers to the question above.

physics
luckily a right triangle with legs of 3 and 4 has a hypotenuse of 5 so there is no need to use c^2 = a^2 + b^2 to get the magnitude. The cosine of the angle south of west is 3/5 so the angle is 53.13 degrees south of west which is 180 + 53.13 degrees counterclockwise from the ...

physics
west = 2.5 km south = 10 km magnitude = sqrt(6.25 +100) tan of angle south of west = 10/2.5 = 4 angle south of west = 76 degrees south of west

Math - Derivatives
dy/dx = x^3 +2x^2 -5x +6 = 12 x^3 + 2 x^2 - 5x -6 = 0 x = -3 , -1 , +2 http://www.wolframalpha.com/widgets/view.jsp?id=b858339e64fa997454dd12f77cb1ece1

physics
32 s more,

Math 8th grade
well six one hours plus 2 half hours = 7 hours

Algebra
.5 D + 1 B </= 6

Math
T = L + 19 T + 4 = 2 (L+4) =================== L+19 + 4 = 2 L + 8 L = 15 T = 34

Oh maybe it means
does not do 40 for the whole 20 sec, but only for 20 - 4 = 16 s so 100 + 40*16 = 640 + 80 = 820 ..... not a choice though.

physics
The trick is to use average speed for a time of constant acceleration v = Vi + a t Vf = final v = Vi + a t Vf -Vi = a t so a = (Vf -Vi)/t d = Vi t + .5 a t^2 d = Vi t + .5 (Vf-Vi)t^2/t d = Vi t -.5 Vi t + .5 Vf t d = .5(Vi+Vf) t BUT .5(Vi+Vf) IS the average speed during ...

physics
average 20 for first 5 so 100 m go 40 for 20 s so 800 more now brake average 20 for 4 = 80 980 so I agree

math
What does full mean? Multiply by 3 every day? That is called geometric sequence http://www.mathsisfun.com/algebra/sequences-sums-geometric.html Say A is amount on day 1 then on day 12 you have A(3)^11 and on day 4 you have A(3)^3 3^11/3^3 = 3^8 = 6561 so you have 6561 times as...

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
By the way, GOOGLE Archimedes

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...

enough already
I already answered most of these.

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
yes

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

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