Thursday
August 28, 2014

Posts by Damon


Total # Posts: 18,115

math
20* .3 + 15 * .05 = 6 + .75 = 6.75 ============================ the middle 8 tables only seat 2 but the two end tables seat 3 8*2 + 2*3 = 16 + 6 = 22
May 22, 2014

algebra
h(m+1) = 2 f f = h(m+1)/2
May 22, 2014

5th Grade ADV. Math
You are welcome :)
May 22, 2014

5th Grade ADV. Math
another way A plays the other 3 B plays only C and D more because has already played A that is 2 more C plays only D because has played A and B so one more 3+2+1 = 6 again plus that last game = 7
May 22, 2014

5th Grade ADV. Math
That did not line up right, but I hope you see the point
May 22, 2014

5th Grade ADV. Math
Whoops, you do not do it that way in grade 5 Make a grid ___A___B___C___D A --- * --* --* B----------*---* C--------------* D ------------- The stars are the games played in the first round You see there are 6 of them then the final is 7
May 22, 2014

5th Grade ADV. Math
combinations of four taken two at a time = 4C2 = 4!/[ 2! (4-2)! ] = 4*3*2 /(2 * 2) = 6 games before the final so 7
May 22, 2014

calculus
If you draw this you see you want the integral from y =0 to y = 3 of -x dy y = ln(1-x) e^y = 1-x -x = e^y -1 so integral from 0 to 3 e^y dy - dy e^y - y at 3 = e^3-3 e^y - y at 0 = 1 so e^3 - 4 about 20 - 4 = 16
May 22, 2014

pre-algebra
when x increases by 2, y always decreases by 1 so m = slope = -1/2 y = -x/2 + b put in a point like (4,0) 0 = -4/2 + b so b = 2 so y = -x/2 + 2
May 22, 2014

Math
You are welcome.
May 22, 2014

Math
The top of the first rainbow will not fit into the bottom of the one above it.
May 22, 2014

math
tan 15 = d/495
May 22, 2014

math
You are welcome :)
May 22, 2014

math
yes -10 + 8 = -2 yes 9 - (-9) = 9+9 = 18
May 22, 2014

Algebra where did I go wrong
5! / [ 2! (5-2)! ] 5!/(2! 3!) 5 * 4 * 3 *2 /(2 * 3 * 2) 10
May 22, 2014

math
combine LIKE terms 8x + 6 x = 14 x 2 = 2 so 14 x + 2
May 22, 2014

MATH
You are welcome.
May 22, 2014

MATH
L * w = 225 2 L + 2 w = 60 so L + w = 30 and w = 30-L L (30-L) = 225 30 L - L^2 = 225 L^2 -30 L + 225 = 0 (L-15)(L-15) = 0 L = 15 meters
May 22, 2014

SCIENCE HELP !!
Do muskrats eat catfish? If so, they might get hungry.
May 22, 2014

college calculus
.5 = e^-k(5730) ln .5 = -.6931 = - 5730 k k = 1.2097*10^-4 .45 = e^-1.2097*10^-4 t ln .45 = -.7985 = -1.2097*10^-4 t t = 6601 years
May 22, 2014

Algebra
I can not. { x-[ -2 + sqrt(160) ]/6} * {x+[ -2 + sqrt(160) ]/6}
May 22, 2014

History
I guess I would go with Midway of the choices above. He certainly did not buy Alaska from Canada :)
May 22, 2014

History
seward's folly
May 22, 2014

History
Lots of things, including buying Alaska (Seward's Folly)from Russia :)
May 22, 2014

algebra/ Can see I am right
arrangements of three letters: 26^3 = 17576 but subtract 241 17335 times 1000 17,335,000
May 22, 2014

Math please check my answers?
237 (1.02)^t is correct
May 22, 2014

Math please check my answers?
slope = (83- -29) / (-2 - -10) = 112/8 = 14 which is indeed positive :)
May 22, 2014

appliance repair
Although E is the answer they are looking for, E is much more commonly used for the electric field strength which is Volts per meter. The question is poorly written.
May 22, 2014

Algebra
You are welcome. This is a good example to diiferentiate between combinations and permutations Combinations of 31 taken 5 at a time would be 31! /[ 5! (31-5)! ] That takes into account all the different groups of five you can make, but does not order the five for specific ...
May 22, 2014

Algebra
It is not combinations because the order matters, it is permutations. (Joe could be either president or vice president for example and those are not the same) 31!/(31-5)! = 31!/26! = 31*30*29*28*27 = 20,389,320
May 22, 2014

Evaluate the expression.Algebra
9*6*3 /(6*4) 9*3/4 27/4
May 21, 2014

geometry
2 x + 10 = 80 2 x = 70 x = 35
May 21, 2014

physics
used up 67,500 + 290,000 - 30,000 Joules
May 21, 2014

math 6 probaility
there are four possible outcomes of flipping a pair h h h t t h t t so you should get h h 60/4 = 15 times we got it 24 or 9 more times than expected
May 21, 2014

math 6 probability
It is a whole new game after the first play. 75% IF you had said what is the probability of him hitting two in a row, that would be .75*.75 BUT that is NOT what you were asked.
May 21, 2014

math
up 4 in horizontal 10 so 4/10 = .4
May 21, 2014

math
do the others the same way
May 21, 2014

math
That was using the distributive property. You can also use FOIL if you know it.
May 21, 2014

math
4. (3x + 4)(x – 2) (1 point) 3x(x-2) + 4(x-2) 3 x^2 - 6 x + 4x - 8 3 x^2 -2x - 8
May 21, 2014

math
2 x * 10 x = 2*10 * x *x = 20 x^2 2. –3m(m + 8) = -3 m(m) + -3m(8) = -3m^2 - 24 m
May 21, 2014

math 6 probability
no, it hit the red section 225 times out of 1125 times spun
May 21, 2014

math 6 probability
5*225 = 1125
May 21, 2014

History
I guess you are talking about Canada maybe? Railways came after the revolution in the US. Was Canada several colonies so they could have inter-colonial railways?
May 21, 2014

Algebra please check my answers
4) The formula below can be used to find the amount of radioactive material that remains after a certain period of time, where A0 is the initial amount of material, A is the amount of material remaining after t hours, and k is the decay constant. A = A0(2.71)-kt...
May 21, 2014

Algebra please check my answers
3) Robert is considering purchasing a manufactured home that costs $77,300. If he expects the home value to decrease 8% each year, which function will show the value of Robert's manufactured home in t years? A. V(t) = $83,484t B. V(t) = $77,300(-0.92)t C. V(t) = $77,300(1....
May 21, 2014

geometry
6/15 = x/81
May 21, 2014

Math
band alone 11 choir alone 17 band and choir alone 4 band and math alone 7 math and choir alone 6 band choir and math 3 math alone 9 from 11+4+10+6+17 + M = 57 so 2 classes = 4+7+6 = 17
May 21, 2014

Math 6 meters help
144 = 2L + 2 w so L + w = 72 L = w + 4 so w + 4 + w = 72 2 w = 68 w = 34 then L = 38 A = L * w = 38 * 34 = 1292
May 21, 2014

algebra
not combinations because order does not matter in combinations we need permutations of 7 taken 4 at a time p(n,r) = n!/(n-r)! = 7!/3! = 7*6*5*4 = 840
May 21, 2014

Algebra
x intercept of f(x) = -3 y intercept of f(x) = 12 g(x) = -3 x -9 x intercept of g(x) = -3 y intercept of g(x) = -9 so it is not A
May 21, 2014

HIS204
By the way I agree with Stephen and with Ms. Sue. However I feel especially strongly about 4.4 since I lived in California during the war and friends of my family were included. http://www.history.com/this-day-in-history/war-relocation-authority-is-established-in-united-states
May 21, 2014

HIS204
4.4 !!!! Look up history of Japanese - Americans during WW2
May 21, 2014

Math
8*8 = 64 squares first piece has two possible spots so 2/64 is chance it will pick one of them now there are 63 spots left and the second piece has to hit it. 1/63 is that probability 2/64 * 1/63 = 4.96*10^-4 = .000496 ------------------------------- 8 rows first piece can hit...
May 21, 2014

Math 6. Correct?
You are welcome.
May 21, 2014

Math 6. Correct?
3/18 = 5/30 yes
May 21, 2014

Math 6. Correct?
30 feet = 360 inches 360/5 = 72 to 1 4.5 inches * 72 = 324 inches = 27 feet not 29.5
May 21, 2014

trianom
the minute hand does two complete circles distance around 2 circles = 2 * 2 pi r = 4 * pi * 9 = 113 inches
May 21, 2014

Physics
That link is to the commutator page. Go back one page in the link to see why the current in the armature electromagnet must be reversed every half turn.
May 21, 2014

Physics
reverses current in armature as the shaft turns so that torque is always in the same direction. http://electronics.howstuffworks.com/motor5.htm
May 21, 2014

Civics
I should hope D (I think you mean opinions, not options). However all too often we seem to get A
May 21, 2014

u.s. history
We entered WW1 toward the end of the war and the country was not nearly so involved in WW1 as in WW2. After WW1 tough, we were a major nation on the world stage because the arrival of American troops in France was crucial to the allied victory.
May 21, 2014

u.s. history
Well I see that Victory gardens and stamp ration books for example were used in both wars, but sorry, I do not know enough about WW1 in the USA to help.
May 21, 2014

u.s. history
Do you men WW1 or WW2 ???? Your answers apply to WW2 Not sure about WW1, was not there, but it was short for the USA (NOT for Europe !! ) and did not require the home front mobilization of WW2
May 21, 2014

help please on this
mutation see: https://answers.yahoo.com/question/index?qid=20120409133046AADHBVS
May 21, 2014

Physics -- check answers please
2, yes c 3. is D. You need a transformer and rectifier in the little box you plug in to the wall to charge your cell phone.
May 21, 2014

Physics -- check answers please
1. a If you look at a maritime chart you will see that true north is up toward the top of the page but magnetic north is a different direction, here about 17 degrees to the west for example.
May 21, 2014

Math - Inequalities
You are welcome :)
May 21, 2014

Math - Inequalities
a closed dot means included like x < 5 means less than (open) x </= 5 means less than or equal to (closed) http://mathcentral.uregina.ca/QQ/database/QQ.09.05/cynthia1.html
May 21, 2014

math
tan slope = 13/5 slope = tan^-1 (13/5) = 69 degrees
May 21, 2014

Geography
They were heavily involved in maritime trade with everyone from China to Egypt even long before Vasco de Gama opened the Indian Ocean and then the South China Sea to European traders and they tended to adopt the religions brought by the people they traded with. That includes ...
May 21, 2014

math 6 rule pattern
You are welcome.
May 21, 2014

math 6 rule pattern
except for 3 3 they are all multiply by 2, add 1 I bet 3 3 should be 3 7
May 21, 2014

error at end
t at top = 14/9.8 = 1.43 s total time in air = 2t = 2.86 s 20 = u (2.86) so u = 6.99 m/s so U = sqrt (6.99^2+14^2) = 15.64 m/s and tan theta = 14/6.99 theta = 63.5 degrees
May 21, 2014

furthermathematics
Initial vertical speed Vi = U sin theta constant horizontal speed = u = U cos theta horizontal problem 20 = U cos theta * T where T is time in air vertical problem v = Vi - g t v = 0 at the top so t at top = Vi/g g = 9.8 m/s^2 on earth so t at top = Vi/9.8 now at the top at 10...
May 21, 2014

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

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