Thursday

August 28, 2014

August 28, 2014

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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