Tuesday
July 29, 2014

Posts by Damon


Total # Posts: 17,557

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

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

Math
You are welcome.

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

math
tan 15 = d/495

math
You are welcome :)

math
yes -10 + 8 = -2 yes 9 - (-9) = 9+9 = 18

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

math
combine LIKE terms 8x + 6 x = 14 x 2 = 2 so 14 x + 2

MATH
You are welcome.

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

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

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

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

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

History
seward's folly

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

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

Math please check my answers?
237 (1.02)^t is correct

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

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.

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 offi...

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

Evaluate the expression.Algebra
9*6*3 /(6*4) 9*3/4 27/4

geometry
2 x + 10 = 80 2 x = 70 x = 35

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

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

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.

math
up 4 in horizontal 10 so 4/10 = .4

math
do the others the same way

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

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

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

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

math 6 probability
5*225 = 1125

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?

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 !!!!!!!! =====...

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....

geometry
6/15 = x/81

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

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

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

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

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

HIS204
4.4 !!!! Look up history of Japanese - Americans during WW2

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...

Math 6. Correct?
You are welcome.

Math 6. Correct?
3/18 = 5/30 yes

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

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

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.

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

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

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.

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.

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

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

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.

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.

Math - Inequalities
You are welcome :)

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

math
tan slope = 13/5 slope = tan^-1 (13/5) = 69 degrees

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 H...

math 6 rule pattern
You are welcome.

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

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

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...

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-...

Science Check Answer?
You are welcome.

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

Math 6 gemoetery
You are welcome :)

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

science
Yes

science
http://www.thefreedictionary.com/Selectively+permeable

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

science
Oh come on, make a guess :)

Algebra
13-2 = 11 9-4 = 5 so 11 a + 5 b

Science 1 question
Yes, confusing.

Science 1 question
Yes, A

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

Science Check Answers?
alveolus has high surface area to allow lots of gas exchange

English
B I think yes C yes B

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

math
x </= 5-2.25 x </= 2.75

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

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

math
sure enough, 20 months

math
total paid = 35 * number of months 700 = 35 * n so n = 700/35

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

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

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

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

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

Algebra
whoops, sorry, thanks !

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

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

geometry
You are welcome, good luck !

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

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

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

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