Posts by Damon

Total # Posts: 30,122

calc
integrate to find x(1) and x(7) x(7)-x(1) is the displacement vector to find the distance scalar we must know when the particle is moving forward and when back and integrate over those intervals adding absolute values v = t^3 - 10 t^2 + 27 t - 18 integral = t^4/4-10t^3/3 +27t^...

Calc
integral of (500-3t) = 500 t - 1.5 t^2 at t = 13, integral = 500(13)-1.5(169) = 6500 - 253.5 = 6246.5 liters

Math
integer

Math
Are you sure you mean sqrt(-9) ??? That is an imaginary number. Maybe you mean sqrt (25-9) = sqrt (16) which is 4 which is a whole number and an integer

Math
5 + sqrt -9 5 + 3 sqt(-1) 5 + 3 i complex

math
m < 13 n > 13 p < 5 I think you mean at most 35 people 20 + a <= 35 a <= 15 so no more than 15

watch units!
watch out, km/hour given

Calc
a = (V2-V1)/(t2-t1) V2 = 90,000/3600 = 25 m/s V1 = 25,000/3600 = 6.94 t2-t1 = 13 so a = 1.39 m/s^2 ====================== d = V1 t + (1/2)a t^2 = 6.94 *13 + .695*169 = 208 m

Science
sounds right to me

Math
using same web site for normal dist A = .1 M = 72 sd = 9 .1 area is anything below 60.46 If I try bottom .3, anything below a C, I get A = .3 ---> below 67.28, that is the boundary for the HIGHEST D

Math
http://davidmlane.com/hyperstat/z_table.html area = .4 mean = 72 SD = 9 .4 are between 71.5 and 72.5 so 71.5

physics
total drop = 2.2+ .55 = 2.75 m drop in gravity Potential energy = = 6.95 * 9.81 * 2.75 = increase in spring Pe = (1/2)k x^2 = .5 *k * .55^2 so k = (6.95*9.81*2.75)/(.5*.55*.55)

math algebra
cold 1/8 tub/min hot 1/12 tub/min drain -1/7 tub/min so sum 1/8 +1/12 - 1/7 tub/min = 3/24 + 2/24 - 1/7 = 5/24 - 1/7 = 35/168 - 24/168 = 11/168 tubs/min = 168/11 min/tub = 15.3 min

Math
false say 1 by 1 1*1 = 1 cm^2 but 1.1 * 1.1 = 1.21 cm^2 .21 is more than .1 :)

physics
Ke = (1/2)m v^2 = Pe = (1/2)k x^2 (1/2)m (2v)^2 = (1/2)k (nx)^2 v^2 multiplied by 4 so x^2 multiplied by 4 so 2 times original x

Math
mean win = (1+2+3+0+0+0) = 6/6 = $1 so lose .25 per toss so lose $25 for 100 games

PRE-CALCULUS
a) 150,000 * 1.054^20 = 320,440.07 check do the others the same way as I showed you in the previous problem below

PRE-CALCULUS
r = .12/n where n = times per year a = 5000 * (1+r)^8n eg annual: 5000 * 1.12^8 semi where n = 2 5000 * 1.06^16 quarterly where n = 4 5000 *1.03^32 etc continuous a = 5000 e^.12 t = 5000 e^.96 = 13058.48

Math
3*18 = 54 m^2

Math
b/g = 7/9 g-12 = b so (g-12)/g = 7/9 9(g-12) = 7g 2 g = 108 g = 54 b = 42 sum = 96

Science
on the other hand if he carried it 500 m UP, then 100 * 500 = 50,000 Joules The problem does not say direction so who knows?

MATH HELP!!
Starlight Tree Farm sells Douglas firs and Noble firs. One December they sold 139 more Douglas firs than Noble firs. The total number of trees sold was 377. Which equation could be used to solve for n, the number of Noble fir trees sold

MATH HELP!!
You are welome

MATH HELP!!
25 6/25 - 20/25 = -14/25

math
100 times the fraction

US History
I guess maybe because Fort Neccessity is near Pittsburgh?

Calculus
delta x = .1 x range ____ y at right 1.0 to 1.1 ____ 2/1.1 = 1.82 times .1 = .182 1.1 to 1.2 ____ 2/1.2 = 1.67 times .1 = .167 1.2 to 1.3 etc in the end add them up .182 + .167 etc

US History
I do not think slaves were in Rhode Island before about 1700 so I agree with you. Pilgrims landed in Plymouth MA in 1620 and settlement of RI was thus later than that. I have my doubts about timing in SC as well.

physics typo?
Vi = 47 m/s d = 50 =============== v = Vi + a t 0 = 47 + a t a t = -47 or a = -47/t =============== d = Vi t + .5 a t^2 50 = 47 t + .5 a t^2 50 = 47 t +.5(-47/t)t^2 50 = 47 t - .5*47 t 50 = .5*47 t t = 100/47 then a = -47/(100/47)= -22 m/s^2 > twice gravity I think maybe ...

Math
13 = .65 x x = 13/.65 = 20

Math
(1/3)/5 = 1/15 but 5/(1/3) = 15

US History
The Spanish certainly DID find gold. They became the most powerful country in Europe for a while due to their riches from the New World. So I agree with you.

Math algebra
I have a hunch you mean f(x)= (x-2)/(x^2-81) which is (x-2)/ [ (x-9)(x+9) ] it is zero if the numerator is zero so when x = 2 it is undefined when the denominator is zero x = 9 or x = -9

Math algebra
AVA + .2*10^9 = 2 * AVE T + .6*10^9 = AVA AVA + AVE + T = 6.5*10^9 ============================ do them all in billions well T = AVA - .6 AVE = .5 AVA + .2 so AVA + .5 AVA + .2 + AVA - .6 = 6.5 2.5 AVA = 6.9 take it from there

Math algebra
(20+2x)(30+2x) = 936 600 + 100 x + 4 x^2 = 936 4 x^2 + 100 x - 336 = 0 x^2 + 25 x - 84 = 0 (x - 3 )(x + 28) = 0 x = 3 feet

ANOTHER TRIANGLE MATH PROB!
Get it?

ANOTHER TRIANGLE MATH PROB!
I said 12, and 12 is an option

ANOTHER TRIANGLE MATH PROB!
Now maybe you need to do this a more official way to really get it 21/24 = 10.5/x we want to get the 24 and the x out of the bottom so multiply both sides by 24 x 24 x (21/24) = 24 x (10.5/x) 21 x = 24 * 10.5 x = 24 * (10.5/21) x = 24 * (.5) x = 12

ANOTHER TRIANGLE MATH PROB!
21/24 = 10.5/x well 10.5 is half of 21 and we all know 12 is half of 24 so 10.5/12

Physics === Not hard
(1/2) k x^2 = (1/2) m v^2 k (.07)^2 = .0055 (11.4)^2

physics
Ke = (1/2) m v^2 = .5*.00335 * 255^2 in Joules = mass * heat of fusion of water = 3.35 * 333 J/gram

Math (equation of tangent line)
That is the second strange tangent line problem today. The first one was horizontal :)

re: Differential Calculus
Just copy your function into there: x^2cos^2y - siny = 0 look at the solution close to (0,0)

re: Differential Calculus
I mean parallel to x axis and y = pi for part 2, normal is up the y axis see http://www.wolframalpha.com/widgets/view.jsp?id=91851988c40ebbe236f5561e167c9ab8

Math
You are welcome.

Math
sqrt 15 = 3.873 3.873 * 10 = 38.73 which is about 39 so yes

TRIANGLE HELP!!!! (MATH!)
3/4 = 6/8 = 9/12 = 12/16 = 15/20

math
74 + 12*52 = 74 +624 = 698

Tod
Cool !

math
7/12 blue (12-7)/12 = 5/12 red

Math
(1/3) n = 5 n = 3*5 = 15 nights

Math
1.06 * 20.00 = 21.20

Arithmetic
3 for .20 is 12 for .80 so profit of .80-.70 = .10 dollars/dozen so .60 = 60 cents for 6 dozen

Physics
eff = Q/W = T2/(T1-T2) T2 = 26 + 273 T1-T2 = 33-26 = 7 eff = 299/7 = 42.7

Physics
gain in potential = m g h = 65 * 9.81 * 1100 Joules eff = ..25 so .25 energy = 65* 9.81 * 1100 so energy expended = 4*65*9.81*1100 Joules 4184 Joules = 1000 calories so in Calories (4/4.184)65*9.81*1100 power = energy expended/ time in watts = 4*65*9.81*1100/(37.5*60)

Math
1 2 3 4 5 6 first die 1 1 1 1 1 1 second die 2 2 2 2 2 2 3 3 3 3 3 3 4 4 4 4 4 4 5 5 5 5 5 5 6 6 6 6 6 6 total of 36 possibles the number one shows up 11 times 36 -11 = 25 times no ones 11/36 -25/36 = - 14/36 = -7/18

not linear
3495 *.8^t .8^5 = .328 or about $1150 which is not nothing but is also not much

Algebra
maybe: same as the probability that one of the numbers you choose is zero probability that first one is zero = 1/6 probability that second one is zero also is 1/6 so sum is 2/6 = 1/3

CHEMISTRY
try Gooling: ETHYLENE GLYCOL or antifreeze :) suspect it is Ethane-1,2-diol

Calculus
do the integral 4(x^2+1) dx/x^2and divide by the span which is 3-1 = 2 4 x^2 dx/x^2 + 4 dx/x^2 is 4 x - 4/x = 4 (x-1/x) at 3 = 4(3-1/3) = 32/3 at 1 = 0 so 32/3 divide by 2 16/3

American government
Well, if you just want my opinion as an uninvolved friend of the student, yes.

American government
I hope not. Read: http://www.google.com/search?q=amicus+curiae&ie=utf-8&oe=utf-8

american government
http://www.jiskha.com/display.cgi?id=1479316937#1479316937.1479317141

Dynamics
Vi = 80,000 m/3600 s a = -3.24 v = Vi + a t 0 = 80/3.6 - 3.24 t d = Vi t + (1/2) a t^2 = (80/3.6) t - 1.62 t^2

Calculus
(4/3)(x+3)^(1/3) but 0^(1/3) = 0 so right, zero

Math
x = xi - 5 y = yi + 7

math
b-s = 15 3 b = 8 s so b = 8s/3 8s/3 - 3s/3 = 15 5 s/3 = 15 s/3 = 3 s = 9 b = 9+15 = 24

maths
200 + 200 + 300 + 300 :)

Science
.01 * 6*10^23 * electrons per ion Do you really mean total electrons or valence electrons? If the latter it is two.

math
1.25^n = 2 n log 1.25 = log 2 n = log 2/ log 1.25

Math
(3*60/2) minutes /(1/5)minutes/pancake = 15 *30 = 450 pancakes and I do not believe you cook 5 pancakes per minute

math
360 = v t 360 = (v+10)(t-3) = vt -3v + 10t -30 so vt = vt -3v + 10 t - 30 10 t = 3 (v+10) but t = 360/v 3600/v = 3 v + 30 3 v^2 +30 v - 3600 = 0 v^2 + 10 v - 1200 = 0 v+40)(v-30) = 0 v = 30

math please explain!
You are welcome.

math please explain!
this is because in feet and seconds acceleration of gravity, g = 32 ft/s^2 then velocity v = Vi - g t where Vi is initial velocity and g = 32 ft/s^2 and height h is h = Hi + Vi t - (1/2)g t^2 in this problem h = Hi + Vi t - 16 t^2 where Hi = 20 and Vi = 120

math please explain!
h = 20 + 120 * 3 - 16 (9) = 20 + 360 - 144 in feet where g = 32 ft/s^2

The Maths
multiply second equation by -1 then add +4x + 3y = -2 -4x + 4y = 16 ---------------add 0 + 7 y = 14 so = +2

Math
diameter = twice the radius

Science
v = Vi + a t v = 10 + 2.5 t 40 = 10 + 2.5 t t = 30/2.5 x = vi t + (1/2) a t^2 = 10 t + 1.25 t^2

Maths
weight of dog at time t how much weight the dog gained between those times

Math
60/4 = 15

Calc
well the integral is x^4/4 + C Now in between x = 0 and x = 3 the slope of the integral must be f(0) = 0 f(3) = 27 so the integral must be between 0 + 0(3) = 0 or 0 + 27*3 = 81 In fact the integral is 3^4/4 = 81/4 or about 20

science
v = Vi + a t v = 0 + 2 (3.2) = 6.4 m/s

Math
(x+25)/2 = 3 x

Science
Flat , perpendicular hard walls, ceilings and floors are a no-no. Use heavy carpets, hanging heavy fabric, and soft ceiling tile. Break up the flat perpendicular surfaces with nooks and crannies and odd angles and big furniture. Use soft seating in an auditorium. You can get ...

Chem
.065 = .15 x + .01 .15 x = .055 x = 5.5/15

geography
I am inclined to say Google it but you get a barrage of propaganda. With the Balfour Declaration the English opened the eastern coast of the Mediterranean Sea to settlement by Jewish immigrants. That was kind of them but ignored the fact that people, namely Palestinians, ...

Algebra2
You are welcome.

Algebra2
(x+1)(x-3)(x-3) = 0 Three real roots single real at x = -1 double real at x = 3 http://www.wolframalpha.com/input/?i=solve+x%5E3+-5x%5E2+%2B+3x+%2B+9+%3D+0+%3D+0

algebra
one worker paints 400 meters in 5 hours so one worker does 80 meters/hour 80 m/wh * 4 w * 2 h = 640 m

Math
a^2 + b^2 = 36 a + b + 6 = 14 so a = 8-b 64 - 16 b + 2 b^2 =36 2 b^2 - 16 b + 28 = 0 b^2 - 8 b + 14 = 0 b = [ 8 +/- sqrt (64 -56) ]/2 b = [ 8 +/- 2sqrt 2 ]/2 b = 4+/-sqrt 2 if b = 4+sqrt 2 a = 4 - sqrt 2 A = (1/2)ab = (1/2)(16-2) = 7 m^2

math
b + 2 b = 1500 3 b = 1500 b = 500

math
14.0 - 6.7 = 7.3

physics think typo in speed
v = Vi + a t 12.5 = 226 + a t so a = - 213.5/t d = Vi t + .5 a t^2 105 = 226 t - .5 * 213/t * t^2 105 = 226 t - 106.5 t t = .879 seconds a = -213/.879 = -242 m/s^2 you can do the rest but suspect you have a typo

physics
conservation of momentum in N/S and in E/W directions. Initial momentum is zero.

Hey, one is enough
I already did one like this below.

physics
total mass = .14 +.47 = .61 kg weight = .61*9.81 friction force = .5 * .61 * 9.81 work done = force * distance = .5*.61*9.81*6.8 so (1/2)(.61) v^2 = .5 * .61 * 9.81*6.8 where v is initial speed of can with pellet v^2 = 9.81*6.8 solve for v now conservation of momentum u is ...

physics
get speeds from conservation of momentum 93 g = 60 v 15 g + v t = 83 15 g = 83/2 --------------- so -------------- g = 83/30 = 2.77 v = 93/60 *83/30 = 4.29 v t = 41.5 t = 9.67 seconds check 9.67 * 4.29 = 41.5 15 * 2.77 = 41.55 v/g = 4.29/2.77 = 1.55 93/60 = 1.55 ok

Science
v = Vi - g t = 15 - 9.81 (.5) = 10.1 m/s h = Vi t - 4.9 t^2 = 15 (.5) -4.9(.25)

Physics
3.70 v + 4.70 (8) = (3.7+4.7)(15.6)

I do not know
If you fired it straight up, the truck would not move. If you fired it straight back and there were no brakes on the truck then 53.8 (41.7) = (856-53.8) v

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