Wednesday
September 24, 2014

Posts by Damon


Total # Posts: 18,632

Algebra 2 Answer Check
1. 2/√3 A: 2√3 / 3 yes 2. -18/√6 A: -3√6 yes Add or subtract. 3. 4√3 - 9√3 A: -5√3 yes 4. √8 - 15√2 A: -13√2 yes 5. √45 + √20 A: 5√5 yes 6. 2√48 + 2√12 = 2 sqrt (4*12) + 2 sqrt 12 = 4 ...
September 2, 2014

Algebra 2. HELP
You are welcome.
September 2, 2014

Algebra 2. HELP
I think you can graph straight line t = 0 to t = 8 (end of shift, you still have 18 left for the next shift :( n = 42 to n =18 -3(5) + 42 = 27
September 2, 2014

What is P?
1.05^3 = 1.157625 1.157625 * x = 8600 x = 7429.00
September 2, 2014

algebra
5 r </= 1 r </= 1/5 so what is the problem?
September 2, 2014

Math 2
56 = 2*2*2*7 96 = 2*2*2*12 7 rows of 8 and 12 rows of 8
September 2, 2014

Math
6, linear, 3 -6 = -3 7, V shaped, not linear -4+2 = -2 but |-2| = +2 8, certainly not linear, infinite (undefined) at x = 2 !!! You had to ask me that ???? 2 /(6-2) = 1/2 14, same sort of problem as 8
September 2, 2014

Math
if it has x^2 in it it is certainly NOT linear !!! f(1) = 1^2 + 1 - 2
September 2, 2014

Math
hey, y = m x + b is a straight line this is y = 1 x + 5 m = 1 b = 5 if x = -2 y = -2 + 5 = 3
September 2, 2014

Math
Huh? -2 + (-5/12) -3 5/12 + 1
September 2, 2014

calculus/physics
typo, 62 lbs/ft^3
September 2, 2014

calculus/physics
I do not know what y = x10 means Whatever the function is you must find the distance from the top (y =1) down to the centroid, which is the center of mass of the water. That is the distance you have to lift the water, call it h. Then find the volume V , the area times 2 feet. ...
September 2, 2014

phys urgent!
I do not have time to run your numbers but your approach is correct. constant Vx = 2.4*10^6 cos 38 so t = .015 /Vx Vyi = 2.4*10^6 sin 38 y = Vyi t -(1/2)(qE/m) t^2 = 0 at x axis
September 2, 2014

Algebra 2
ALWAYS !!!!!!!!!!!~!~!!!!
September 2, 2014

Algebra 2
http://www.mathsisfun.com/associative-commutative-distributive.html check out associative
September 2, 2014

chemistry. You did not ask a question
They both displace the same volume and mass of water so both weights are reduced by density of water * g * volume of cube
September 2, 2014

Algebra1
5 c = -30 c = -6
September 2, 2014

physics
v = (4/3) pi r^3 dv/dr = 4 pi r^2 (which is the surface area of course :) dv = 4 pi r^2 dr dv/v = 4 pi r^2 dr/(4/3)pir^3 dv/v = 3 dr/r here dr = .04 and r = .84 so 100 * 3 dr/r = 12/.84 = 14.3 %
September 2, 2014

Maths
x and (60-x) now in six years Tom = (x+6) brother = (54-x) (x+6) = 2 (54-x) x+6 = 108 -2x 3x = 102 x = 34
September 2, 2014

Finance
http://www.mortgagecalculator.org/ pmt = principal [ r/ {1 - (1+r)^-n} ] here principal = 150,000 r = interest rate / month = .08/12 =.006666666 n = 12 * 30 = 360 months I get 1100.65 per month that calculator link also says 1100.65
September 2, 2014

Maths,Physics,life science,geography,
I assume you mean Vi = 100 m/s and a = -5 m/s^2 v = Vi + a t 0 = 100 -5 t t = 20 seconds to go from 100 to 0 at -5m/s^2 d = Vi (20) - (1/2)(5)(20)^2 d = 100 (20) - 2.5(400) = 2000 - 1000 = 1000 meters to stop, runs 200 meters beyond the end of the runway into the harbor where ...
September 2, 2014

Math
You only have three sides, usual solution does not apply 2 w + L = 750 (note not 2 L) so L = 750 - 2 w A = w L = w (750-2w) -2w^2 + 750 w = A w^2 - 375 w = -A/2 w^2 - 375 w + (375/2)^2 = -A/2 + 35156 (w-375/2)^2 = -(1/2)(A -70,312) max at w = 375/2 = 188
September 2, 2014

math
length = x width = 2000/x 2x + 2 (2000/x) = 180 x + 2000/x = 90 x^2 + 2000 = 90 x x^2 - 90 x + 2000 = 0
September 2, 2014

Math
circumference of tire = pi D = 36 pi =113 inches/revolution 55 mi/h (1 h/60min)(5280ft/mi)(12 in/ft) = 58,080 inches/min 58080 inches/min (1 rev/113 in) = 514 rev/min 514 rev/min ( 2 pi radians/rev) = 3229 radians/min
September 2, 2014

Math, Calculus
what angle has a cosine = .49 ?? cos^-1 .49 = 60.66 degrees so our answers are 60.66 degrees above and below the negative y axis (180 deg) 180 - 60.66 = 119.34 degrees 180 + 60.66 = 240.66 degrees
September 2, 2014

Math
radius = 20 height of center = 25 height = 25 + 20 sin [2 pi t/4 - pi/2} I use 2 pi t/4 because that gives 0 at t = 0 and a full revolution, 2 pi, at t = 4. I put in the phase of -pi/2 so that at t = 0 we have 25 +20 sin -pi/2 = 25 - 20 = 5 meters, the starting point at t = 0...
September 2, 2014

Math
2 A = 87-63 = 24 so A = 12 degrees average = (87+63)/2 = 75 so D = 75 + 12 sin (2 pi t/24 - p) where p is the phase to give the right temp when t = 5 when t = 5 sin (2 pi 5/24 - p) = -1 or 5 pi/12 - p = -pi/2 p = 6 pi/12 + 5 pi/12 = 11 pi/12 so D = 75 + 12 sin ( pi t/12 - 11 ...
September 2, 2014

Math
sqrt (25+49) = sqrt 74
September 2, 2014

Physics, Math
Archimedes says: volume of fluid displaced * density of fluid * g = upward buoyant force = weight is neutrally buoyant mass = weight/g = volume*density 2500 * 1.225 = 3063 kg up now subtract the mass of air in the balloon 2500 * rho what is rho, the density of air inside at ...
September 2, 2014

chemistry
Block A has a greater mass in 125 cm^3 than Block B has in 145 cm^3 so Block A is more dense.
September 1, 2014

Physics
d volume/d h = base area (draw a picture :) dv/dt = dv/dh * dh/dt so dv/dt = base area * dh/dt let rho = m/v of candy d m = dv (rho) so dv = dm/rho so (1/rho) dm/dt = base area * dh/dt or dm/dt = rho * base area * dh/dt = (m/v) * L * W * dh/dt
September 1, 2014

calculus
passenger ship east = 16 t if t</= 2 then 16 t is the answer if t >2 cargo ship north = 12 (t-2) (t>2 :) d^2 = (16t)^2 + 144(t^2 -4 t + 4) d^2 = 256 t^2 + 144 t^2 -576 t + 576 d^2 = 400 t^2 -576 t + 576 d = sqrt (400 t^2 -576 t + 576) check, yes that is 32 miles at t...
September 1, 2014

physics
h = (1/2)(9.81)(tfall)^2 h = 330 (7.8-tfall) 660 (7.8-tfall) = 9.81 tfall^2 9.81 tf^2 + 660 tf - 5148 = 0 for the positive root I get 7.06 so the sound comes up for 7.8 - 7.06 = .7407 seconds .7404*330 = 244 meters
September 1, 2014

Math
LOL any percent of 100 is that percent ! 64% of 100 is 64 75% = .75 = (3/4) (3/4)(60) = 3*15 = 45
September 1, 2014

Please check my answers
Richard is renamed "member" after the verb In the second one, you is renamed "member" after the verb.
September 1, 2014

Math
4 /(1/2) multiply top and bottom by 2 8 /(2/2) or 8 ================ (1/4) /(1/3) multiply top and bottom by 3 (3/4) / (3/3) or 3/4 ========================= (15/4) / (1/3) again top and bottom by 3 45/4 = 11 1/4
September 1, 2014

Math
You are welcome. By the way, (I am curious) could you be the same person with the blue and white socks question? It is another subject (probability) entirely on another level.
September 1, 2014

Math
9*70 + 60 = 630+60 = 690 RIGHT !!! 60/70 = 6/7 = .8571428571 which is .86 to the nearest hundredth so 9.86
September 1, 2014

Check please
animals is DIRECT (gave animals, not people:) ZOOS is in a subordinate phrase as is TIME THEM is it all right :)
September 1, 2014

Engineering
for anything pointy with straight sides v = (1/3) area of base * height here 300 = (1/3)(pi r^2) h so r^2 h = 900/pi
September 1, 2014

Math
200 above -30 is 170 above zero. Draw it on a number line.
September 1, 2014

Math
You are welcome :)
September 1, 2014

Math
not quite that easy you start with 30 socks p first blue =6/30 p second blue = 5/29 so .2*5/29 product is p2 blue p first white = 24/30 p second white = 23/29 product is p 2 white so add .2*5/29 + 24*23/(29*30)
September 1, 2014

Math Proof
You are welcome.
September 1, 2014

Math Proof
The key word here is ** EVERY ** epsilon, including one vanishingly small .
September 1, 2014

Math Proof
You say that as epsilon ---> 0, |x-y|--->0
September 1, 2014

Math Proof
yes it has to be for any old epsilon, including one that is vanishingly small so that the difference between x and y is so tiny it does not exist.
September 1, 2014

Math Proof
well epsilon is anything you want it to be, but usually you make it a small number and let it approach zero. If x = 5 and y = 7 then |x-y| = epsilon now we would call epsilon = 2 BUT x is only equal to y if |x-y|< ANY epsilon bigger than zero, including e = .0000000001 so ...
September 1, 2014

Math Proof
on second thought draw x as a point on a number line, then y points epsilon to the right and to the left. Then let epsilon ---> 0
September 1, 2014

Math Proof
well, draw two points on a number line maybe a distance epsilon apart then let epsilon go to zero.
September 1, 2014

Math Proof
LOL, well I suppose one could prove it somehow. It seems to belabor the obvious though.
September 1, 2014

math
You are welcome.
September 1, 2014

math
.2 p = 700 p =3500 .8 p = 2800 That sure is an expensive pair of shoes !
September 1, 2014

physics
call one charge Q1 and call Q2 = (200*10^-6 - Q1)
September 1, 2014

physics
E is the electric field, the force on a point charge of ONE coulomb. You can do it with E for either charge, ten multiply by the charge on the other (the target) sphere. Normally though you would just use the Coulomb law form F = k Q12Q2/r^2 see: http://teacher.nsrl.rochester....
September 1, 2014

MAT222
I answered this below.
September 1, 2014

MAT222
equation 1 2 y = x - 2 equation 2 2 y = x - 2 or both are y = (1/2) x - 1 They are both the same line. ANY old x and y that fits one fits the other.
September 1, 2014

Math
The math is much easier than the mind reading.
September 1, 2014

Math
Is that 3 n not on the right or is that the student's attempt at an answer?
September 1, 2014

Math
3 n^2 = 3 n n^2 - n = 0 n(n-1) = 0 n = 0 or n = 1
September 1, 2014

college algebra ???
I guess if you knew how to use parentheses to tell us what is numerator and what is denominator and what is exponent of what you would not be asking the question so I do not know what to say.
September 1, 2014

math typo
There are an infinite number of functions that pass through that point. You must tell more, like if a line give the slope.
September 1, 2014

Math
[ 3(x+2)/{(x+3)(x-3)} ] / [ 6x(x+2)/4(x+3) ] = [ 2 /{(x-3)} ] / [ x ] = 2 /[x(x-3) ] yes, agree (4/3)(x+3)/(x^2+2x)
September 1, 2014

math
check what these lines look like 2 y = 3 x - 6 5 y = - x + 1 10 y = 15 x - 30 10 y = -2 x + 2 ---------------------subtract 0 = 17 x -32 x = 32/17 (handy number :( ) y = 48/17 -3= -3/17
September 1, 2014

MA112
I answered below but d = b(c-d)/(a-b)
September 1, 2014

math
I am sure this means something to someone. Perhaps if you post it 500 times one of us will figure it out. I failed even before I got to x>#/4
September 1, 2014

MATH
(-1)^3 = -1 * -1 * -1 = -1 -3 (-1)^2 = -3 * - 1 * -1 = -3 +4 = +4 ----------------- add -1-3+4 = 0
September 1, 2014

math
0 like I said before.
September 1, 2014

MA112
You divide both sides by (a-b), not by a - b d = b(c-d)/(a-b)
September 1, 2014

math packet
n nickles (n-6) dimes 5 n + 10 (n-6) = 105
September 1, 2014

math
C + C/3 = 152
September 1, 2014

algerbra
The slopes are the same (m=4) so the lines never intersect and there is no solution.
September 1, 2014

staristics
nobody can answer that without knowing probability that an egg is rotten. Once you discover that use binomial distribution with C(24,4) = 24!/[20!*4!] times p^4 (1-p)^16
September 1, 2014

Physics
You are welcome.
September 1, 2014

Physics
You never converted km/hr to m/s go back and do the first step I gave you Vi = 60 km/h (1 h/3600 s)(1000 m/km) and you will get initial velocity = 60/3.6
September 1, 2014

Physics
I get -6667 N
September 1, 2014

Physics
Show me your steps.
September 1, 2014

Physics
no calculate Vi, the initial velocity, as I showed you. then use Vi in the last line to get a, which is negative because we are braking. Then F = m a = 1200 a
September 1, 2014

Physics
Vi = 60 km/h (1 h/3600 s)(1000 m/km) v = Vi + a t 0 = Vi + a t t = -Vi/a d = Vi t + (1/2) a t^2 25 = Vi (-Vi/a) + (1/2)a (-Vi/a)^2 25 = -Vi^2/a + (1/2)Vi^2/a 25 a = -(1/2)Vi^2
September 1, 2014

math
p^2 + p^2 + 10 p + 25 = 625 2 p^2 + 10 p - 600 = 0 p^2 + 5 p - 300 = 0 (p+20)(p-15)= 0
September 1, 2014

math
x by (2000/x) x + 2000/x = 90 x^2 - 90 x + 2000 = 0 (x-50)(x-40) = 0 I suspect it is longer than it is wide
September 1, 2014

Social Studies
Well, of course you will need a publisher for your book when you finish answering. Perhaps you could start with who won and who lost and why.
September 1, 2014

geography
convection maybe?
September 1, 2014

Physics
slope of vector A = -6.5/5 so slope of perpendicular = 5/6.5 or C dot A = 0 5 Cx - 6.5 Cy = 0 Cy/Cx = 5/6.5 if Cx = 6.5 k then Cy = 5 k C dot B = 6.5 k (-2.5) + 5 k (7) = 15 so -16.25 k + 35 k = 15 18.75 k = 15 k = .8 so Cx = .8 * 6.5 Cy = .8 * 5
August 30, 2014

History
By the way, Maine was part of Massachusetts and Vermont was either New Hampshire or New York depending on who you asked :)
August 29, 2014

science
1-.2 = .8 1-.6 = .4 .8 * .4 * 50
August 28, 2014

math
No matter how you turn it, you two are right and person z is wrong :)
August 28, 2014

History
Making it worse is that often the same crop is grown in the same field season after season, making it super easy for the bugs.
August 28, 2014

History
Those crops tend to be produced as mono cultures, mile after mile of fields of the same crop. That makes it easy for the insects to adapt to the crop culture and multiply fast without having to look around for the stuff they like. It is sort of like you are growing hordes of ...
August 28, 2014

Chem Help
whatever you are distilling boils at a lower temp
August 28, 2014

algebra
t s^2 = (R-3) s^2 = (R-3)/t s = plus or minus sqrt [(R-3)/t ]
August 28, 2014

algebra
multiply everything by 10 2 x - 5 x = 210 -3 x = 210 x = -210/3 x = -70
August 28, 2014

algebra
5/3 and sqrt 3 :)
August 28, 2014

Geography
Alaska only in the winter :) There are a lot of glaciers in Alaska but I would not say it is mainly covered in ice all year.
August 28, 2014

algebra 2
what about 1.573 ?
August 28, 2014

Math Problem (please help)
revenue = 4.59 n cost = 4000 + 2.19 n to break even: 4.59 n = 4000 + 2.19 n profit = revenue - cost 5500 = 4.59 n - 4000 - 2.19 n
August 28, 2014

sorry, forgot 10, you are right
10/k = 4.67 * 10^4
August 28, 2014

Physics ...
number produced per second = 10 number lost per second = r = k n so dn/dt = 10 - k n max when dn/dt = 0 or when n = 10/k now find k from half life experiment dn/dt = -k n dn/n = -k dt ln n = -k t + c n = Ni e^-kt when t = 3.24 * 10^3 n/Ni = .5 ln .5 = -k (3.24*10^3) -.693 = -k...
August 28, 2014

science
work = force * distance in direction of force 2.7 = 4.5 x
August 28, 2014

Physics
100 west and 100 east
August 28, 2014

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