Friday
September 19, 2014

Posts by Damon


Total # Posts: 18,540

science help !!
I am not sure. Although it is a new technology here and CA will have the first one in the uSA it is hardly groundbreaking in Japan for example. Money, legal challenges, mountains, obtaining rights of way...... http://www.sfbg.com/politics/2014/03/07/california-high-speed-rail-...
May 21, 2014

Science Check Answer?
You are welcome.
May 21, 2014

Science Check Answer?
https://www.google.com/search?q=larynx,+trachea,+bronchi,+pharynx,+alveoli&client=firefox-a&hs=wBE&rls=org.mozilla:en-US:official&channel=sb&tbm=isch&tbo=u&source=univ&sa=X&ei=fQJ9U9WkHcKLqAaC-ICgCw&ved=0CE0QsAQ&biw=1011&bih=620
May 21, 2014

Math 6 gemoetery
You are welcome :)
May 21, 2014

Math 6 gemoetery
LOL, well there is one sure way to find out 93 * 58 * 2.47 = 13,323.18 now 6000*1.5 = 9,000 6000*2 = 12,000 the last two are even lower
May 21, 2014

science
Yes
May 21, 2014

science
http://www.thefreedictionary.com/Selectively+permeable
May 21, 2014

science
you are selecting, which means choosing some and not others to let through
May 21, 2014

science
Oh come on, make a guess :)
May 21, 2014

Algebra
13-2 = 11 9-4 = 5 so 11 a + 5 b
May 21, 2014

Science 1 question
Yes, confusing.
May 21, 2014

Science 1 question
Yes, A
May 21, 2014

Chemistry
1 atm is about 1.013*10^5 Pa or 101.3 kPa 101.3 - 2.5 = 98.8
May 21, 2014

Science Check Answers?
alveolus has high surface area to allow lots of gas exchange
May 21, 2014

English
B I think yes C yes B
May 21, 2014

Algebra 2
x = 2 y = -1 sketch graph in Quadrant 4 if theta is angle below x axis sin theta = -1/2 csc theta = 1/sin theta = -2/1
May 21, 2014

math
x </= 5-2.25 x </= 2.75
May 21, 2014

algebra
y = 4 x + 1 y + 2 x = 13 so 4 x + 1 + 2 x = 13 6 x = 12 x = 2 then y = 4(2) + 1 = 9
May 21, 2014

Algbera
add or subtract a full circle (or several of them) 130 + 360 = 490 of course 130 is coterminal with 130 but hardly counts as an answer
May 21, 2014

math
sure enough, 20 months
May 21, 2014

math
total paid = 35 * number of months 700 = 35 * n so n = 700/35
May 21, 2014

math
t is the same for both I assume 65 t + 35 t = distance between LA and NYC t = distance/100 so distance from NYC = 35 * (distance between)/100
May 21, 2014

Calculus
Oh, if you mean the algebra look at the numerator [ x -(x+h)] = x - x - h = -h
May 21, 2014

Calculus
h is a small increase in x which is allowed to approach zero to get the slope of f(x) at x, the definition of the derivative Definition of deriviative of f(x) is: df/dx = {f(x+h) - f(x) ]/h as h-->0
May 21, 2014

Calculus
What do you want, the derivative? if so f(x) = 1/x f(x+h) = 1/(x+h) f(x+h)-f(x) = 1/(x+h) - 1/x = [ x -(x+h)] /[x(x+h)] = -h/ (x^2 + x h) [f(x+h)-f(x)]/h = -1/(x^2+xh) limit as h-->0 = -1/x^2 which is of course the derivative
May 21, 2014

Algebra/Permutation
in general for n items taken r at a time P(n,r) = n!/ (n-r)! for n = 4 and r at a time P(4,r) = 4!/(4-r)! so for 4 taken 1 at a time 4!/3! = 4*3*2*1/(3*2*1) = 4 or for 4 taken 2 at a time 4!/(2)! = 4*3 *2*1/2*1 = 12
May 21, 2014

Algebra
whoops, sorry, thanks !
May 20, 2014

Algebra
mean is 6 yes I get sqrt 80 = 8.94 for SD 2^2 + 2^2+1^2+6^2+3^2+3^2+1^2+4^2 4+4+1+36+9+9+1+16 = 80 sqrt 80 = 8.94
May 20, 2014

Algebra
That standard deviation is much too big. Are you sure it is not the variance and you forgot to take the square root?
May 20, 2014

geometry
You are welcome, good luck !
May 20, 2014

geometry
look at http://www.regentsprep.org/Regents/math/algtrig/ATT1/trigsix.htm you only really need sin, cos, tan for now.
May 20, 2014

geometry
ok, recipe for right triangle where hypotenuse is opposite right angle: sin of angle = opposite side/hypotenuse cos of angle = adjacent side / hypotenuse tan of angle = opposite side/adjacent side
May 20, 2014

geometry
Now Taylor, I told you to draw a picture. what is adjacent side, what is opposite side, what is hypotenuse?
May 20, 2014

Physics
100 sqrt (6^2+1^2) = 100 sqrt 37 = 608
May 20, 2014

physics
P V = n R T P same n same R same so V = k T V1/T1 = V2/T2 V2 = (T2/T1) V1 V2 = (225/300) (3)
May 20, 2014

Math
well, not using the table .7^3 = .343 so you can be pretty sure that C is correct now let the digits of each of those three digit numbers be our test for example. If all three are seven or below, we got a win. There are twenty of those numbers. How many of them have all digits...
May 20, 2014

geometry
cos 81 = x/30
May 20, 2014

geometry
it goes up 8 feet while going horizontal distance sqrt(18^2+225) = 23.4 ft tan theta = 8/23.4 theta = 18.9 deg
May 20, 2014

geometry
tan theta = 17/29 Hey, draw a sketch for these problems so you can see what is opposite, what is adjacent and what is hypotenuse.
May 20, 2014

physics
power = voltage * current = 220 * .45 Watts by the way even at 220 volts, .45 amps does not sound like much to cook pizza.
May 20, 2014

geometry
sin 34 = d/180 d = 180 sin 34 = 100.6 ft
May 20, 2014

physics
output = work done = 530 * 4 = 2120 Joules by the way input = 200 * 15 = 3000 Joules
May 20, 2014

physics
luckily 6*10^5 is much less than light speed of 3*10^8 so not a relativity problem v = Vi + a t 5.94 * 10^5 = 2.95*10^5 + 2.7*10^14 t divide by 10^5 5.94 = 2.95 + 2.7*10^9 t 2.7 * 10^9 t = 2.99 t = 1.107 * 10^-9 seconds
May 20, 2014

MATH HW HELP!!
db/dt = .16 b db/b = .16 dt ln b = .16 t + c e^ln b = b = e^(.16 t +c) = C e^.16 t or more simply b = C e^.16 t when t =0 , e^.16 t = 1 so C = value when t = 0 b = 5 e^(.16*12) b = 34.1 grams
May 20, 2014

physics
m g h = work done to lift = 4*9.81*2.5 = 98.1 Joules
May 20, 2014

Physics
2.7 g/mL * 385 mL
May 20, 2014

MATH HW HELP!!
1.08^18 = 4 so $40,000
May 20, 2014

AP chemistry
the Al heats up the water cools down 25 * .897 * (40-0) = 100 * 4.186 * (Ti-40)
May 20, 2014

math
C = P + 32 M = 4 P - 38 C + P + M = 828 P + 32 + P + 4 P - 38 = 828 6 P -6 = 828 6 P = 834 P = 139 now go back and get C and M
May 20, 2014

MATH HW HELP!!
well, I can do it using daily but I bet continuous compounding will give the same answer to the nearest dollar :) anyway daily interest = .01825/365 = 5 * 10^-5 number of periods = 365 * 4 = 1460 1 + 5*10^-5 = 1.00005 1.00005^1460 = 1.07573 note this multiplier 1.07573 x = 25,...
May 20, 2014

math
You are welcome :)
May 20, 2014

math
d = 4/3 p d + p = 21 or 56 or whatever so (4/3) p + (3/3) p = 21 or 56 or whatever so (7/3) p = 21 or 56 p = (3/7) of whatever and d = 4/3 of that
May 20, 2014

MATH HW HELP!!
12/4 = 3% per period 7* 4 = 28 periods 1.03^28 = 2.288 so 2.288 x = 25,000 x = 10,927
May 20, 2014

Chemistry
You are welcome :)
May 20, 2014

Chemistry
Just look at the units: Joules = Joules/gram deg C * grams * deg C grams cancel deg C cancels left with Joules = .897 * 200 * 10 Joules = 1794 Joules
May 20, 2014

math homework help
r = .045/12 = .00375 number of periods = 12 *3.5 = 42 months 1.00375^42 = 1.170235983 times 250000 = 292,558
May 20, 2014

Calculus
Not necessarily for example if the data lies along a straight line the slope is the same everywhere You have to take a straight edge and try to make it tangent to your graphed curve at the origin. I do not know what your data looks like so can not say.
May 20, 2014

Physics
the period is 2 pi * square root of L/g we know the length however to find the period we need g on the surface of earth g is about 9.81 m/s^3 HOWEVER on the moon for example is is only about one sixth of that so the period will be sqrt 6 longer IN OTHER WORDS WE MUST KNOW g on...
May 20, 2014

Science
F = m a so a = F/m same F, m' = m/2 F = (m')a' a' = F/m' = F/(m/2) = 2 F/m = 2 a
May 20, 2014

Physics
I do not know but I can tell you the MAXIMUM efficiency which is that of a Carnot cycle High temp = 680 + 273 = 953 Kelvin Low Temp = 220 + 273 = 493 Kelvin Carnot efficiency = 100*(hot-cold)/hot = 100 (953-493)/953 = 48.3 %
May 20, 2014

Science
force down = m g - drag so m g-drag = m a where a is acceleration down a = g - drag/m so at the beginning, with low drag, the acceleration down is about 9.8 m/s^2 as the drag increases, the a goes down until terminal velocity is reached. That is when m g = drag when you open ...
May 20, 2014

Science
If the car was moving at 50 mph then you were moving at 50 mph. If the car de-accelerates to a stop suddenly and there is no back force on you, you continue to move at 50 mph (first law) Now the car is stopped and you are moving at 50 mph toward the windshield. It would be ...
May 20, 2014

Physics
w = omega = 16.3revs/min * 2 pi rad/rev *(1 min/60 s) = 1.71 radians/s v = omega r = 1.71 * 10 = 17.1 m/s Ac = v^2/r = 29.1 m/s^2 29.1/9.81 = 2.97 gs F = m a = 70 * 2.97 = 208 Newtons toward center There is no angular acceleration so no torque as far as I know.
May 20, 2014

algebra
OJ .5(8) + x = 2+x Total 8 + x so 2+x = .4(8+x) 2 + x = 3.2 + .4 x .6 x = 1.2 x = 2
May 19, 2014

math
(0,0) (2,0) (4,3) (2,3) well, you could cut it out of cardboard :) It goes to quadrant 2 The top face becomes the left face, so it faces a different way so d If you spin 90 deg left from quadrant 1, how could you be in quadrant 4 ?
May 19, 2014

algebra
If you did include them all (I wonder how many government candidates liked the program?) then .25 * 360 = 90 degrees
May 19, 2014

algebra
what on earth do the students who run for government have to do with this? Leave them out, part of another survey. We asked 230 students about this program evidently 110 of them liked it so (110/230)(360 degrees) = 172 degrees
May 19, 2014

math
for n = 5 coefs are 1 5 10 10 5 1 for example C(5,3) = 5!/[ 3!(5-3)!] = 5*4/2 = 10 so 1 x^5 + 5 x^4(-3) +10 x^3(-3)^2 +10x^2(-3)^3 +5x(-3)^4 +1 (-3)^5 = x^5 -15x^4+90x^3-270x^2+405x-243
May 19, 2014

Asap please????
I am not sure they could be counted there were so many local laws.
May 19, 2014

algebra!!!
I already did this tonight (x+1)(x-1) = x^2-1 = 40 x = sqrt 41 = 6.4
May 19, 2014

Algebra
12 a /(a^2 -3 a -10) if the denominator is zero, that is undefined and out of the domain so all we want to know is for what a is the denominator zero. It does not matter what the numerator is a^2 -3 a -10 = 0 a = [ 3 +/- sqrt (9 +40) ]/2 a = 10/2 or -4/2 so a = 5 or -2 are ...
May 19, 2014

math
You are welcome :)
May 19, 2014

math
Yes, A a REGULAR pentagon has rotational symmetry, but only if REGULAR
May 19, 2014

Math
The mode for the first one is 100 The mode for the second one is 95 first one ranges from 85 to 100 second one ranges from 81 to 100 mean of first is 94 mean of second is 94 remarkable ! median of first is 90 median of second is 95
May 19, 2014

math
takes too long calculate mean, the sum/10 calculate (x-mean)^2 for each x add them divide by 10 take the square root
May 19, 2014

math
(4/15)^2 = 16/225
May 19, 2014

math
4+3+5+2 = 14 two independent 4/14 draws (2/7)^2 = 4/49 = .0816
May 19, 2014

MATH 1 QUESTION VERY HARD PLS HELP ASAP!!!!!
You are welcome :)
May 19, 2014

MATH 1 QUESTION VERY HARD PLS HELP ASAP!!!!!
Of course if we had sketched a graph, we would have seen a straight line and not have bothered with the parabola :)
May 19, 2014

MATH 1 QUESTION VERY HARD PLS HELP ASAP!!!!!
well, try a parabola since we have three points y = a x^2 + b x + c 1 = a (4) + b (2) + c 0 = a (16 ) + b(4) + c -1 = a(36) + b(6) + c subtract second from first 1 = -12 a -2 b subtract third from second 1 = -20 a -2 b subtract 0 = 8 a a = 0, this is a straight line 1 = -2 b b...
May 19, 2014

fdr
x by y x y = 100 23 x + 10 x + 20 y = cost = c 33 x + 20 y = c y = 100/x so 33x + 2000/x = c dc/dx = 0 for min = 33 -2000/x^2 33 x^2 = 2000 x^2 = 60.6 x = 7.785 ft y = 12.845 ft
May 19, 2014

algebra
(x+1)(x-1) = 30 x^2 = 31 x = 5.6
May 19, 2014

math
Yes, A is correct :)
May 19, 2014

math
Oh, sorry Jake, misunderstood your reply
May 19, 2014

math
Jake, your answer is A -5 --->+5
May 19, 2014

math
sketch it on a graph !!! Hint, straight back :) (-3,5)
May 19, 2014

MATH
if you rotate it 60 degrees (360/3), it looks exactly like it did before since there is a corner at every 60 degrees your answer to the second part is correct. Unlike circles, you can cover your flat roof with them with no leaks. http://mathforum.org/sum95/suzanne/whattess.html
May 19, 2014

math
first what is QR which is p? law of cosines p^2 = q^2 + r^2 - 2 p q cos P p^2 = 9.6^2 + 7.4^2 - 2(7.4)(9.6)cos 53 solve for p then law of sines sin R/7.4 = sin 53/ p
May 19, 2014

algebra
y = -3 + cos 2 pi (3/2pi) x or y = -3 + cos 3 x
May 19, 2014

algebra 2
7^(1/5) = fifth root of 7
May 19, 2014

Science
It did not result. The force caused the acceleration ! F = m a F = 3000*20 = 60,000 N
May 19, 2014

Algebra
total females = 80+80+70 = 230 80 of those in humanities first 80/230 = .348
May 19, 2014

algebra
1/sin (7pi/6) 7 pi/6 is pi/6 or 30 degrees below -y axis in quadrant 3 so sin 7 pi/6 = -1/2 inverse is csc = -2
May 19, 2014

math
sketch it in quadrant 2 y = 1 x = -1 tan theta = y/x = -1
May 19, 2014

geometry
1 meter by 0.2 meter boards? area board = .2 m^2 area floor = 50 m^2 50/.2 = 500/2 = 250
May 19, 2014

Math
when does 4 x = 2 pi , a full circle ? x = 2 pi/4 = pi/2 the single amplitude is given, 3
May 19, 2014

Algebra
d^2 = (y2-y1)^2 + (x2-x1)^2 d^2 = 5^2 + 12^2 = 13^2 (5 12 13 right triangle) 13
May 19, 2014

math help
x = -7717/335 y = -36738/335 z= 16662/335
May 19, 2014

typo?
-3 ??? x ???? +13y+29z=81 and what do you want? A solution using Gauss Jordan ? If so go to: http://www.gregthatcher.com/Mathematics/GaussJordan.aspx
May 19, 2014

algebra 1
multiply both sides by -1 This changes the direction of the arrow 2 x/7 + 8 < 9 2 x/7 < 1 2 x < 7 x < 3.5
May 19, 2014

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