Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 17,491

**Math**

t = k/r 2 = k/67 k = 134 (which happens to be the distance) t = 134/r t = 134/55 t = 2.436 hours

**Science**

weight = f ( vitamin A) weight is dependent on vit A hypothesis the weight of the rats depends on how much vitamin A they get in their diet.

**Math**

Carla, Ms Sue told you to type them in order, then look at the middle.

**Math**

even number, average of the two middle ones

**Maths**

y = k/x 2 = k/8 k = 16 y = 16/x a^2-b^2 = (a-b)(a+b) always

**Algebra**

1 2 3 4 5 6 * * 2/6 = 1/3

**Math**

You are welcome :)

**Math**

If c = .2 n = 6/.2 = 30 so sold 25 for .3 so got 25*.3 = 7.5 sure enough

**Math**

1.25 * 6 = 7.5 profit = 1.5 let cost per box = c sales price = s = c+.1 bought n gave away 5 sold (n-5) cost = n c = 6 so n=6/c sales = (n-5)(c+.1) so (n-5)(c+.1) - 6 = 1.5 (6/c -5)(c+.1) = 7.5 6 -5c + .6/c -.5 = 7.5 -5c + .6/c = 2 -5 c^2 -2 c + .6 = 0 5 c^2 + 2 c -.6 = 0 c = ...

**Algebra 1--Please, help me!**

Incomprehensible. Typos?

**Algebra 1**

look for vertex of the parabola in algebra. (You would be able to do it much faster with calculus or physics) t^2 - 9.25 t - 1.875 = -h/16 t^2 - 9.25 t = -h/16 + 1.875 t^2-9.25t+4.265^2 = -h/16 +1.875+21.39 ( t-4.265)^2 = -1/16( h - 372.25) So, I think it is d and at 4.265 sec...

**Math**

Nah, I do not have to do an experiment. there are four equally likely outcomes.

**Science**

http://www.jiskha.com/display.cgi?id=1400875475

**having trouble please help?**

Do you think we should allow them ... starts out biased (should we throw them in jail or merely hang them?) "syrupy soft drink" implies bias ---> Should there be a ----- no bias healthy versus unhealthy ? certainly biased

**Calculation in chemistry**

2 grams of M in 8 grams of MOn where M is metal symbol and n is O atoms per metal atom There were 8-2 = 6 grams of O in MOn 6 grams of O * (1 mol of O/16 grams) = 6/16 = 3/8 mol of O which is 3/16 mol of O2 so 3/16 mol of O2 combines with 2 grams metal so .5 mol of O2 combines...

**Math**

draw a sketch The bottom has height 7 The top has height 9 The left side is at 4 the right side is at 8 what is missing is the upper right at (8,9)

**science**

v = g t 20 = 9.81 t t =2.03 seconds h = (1/2) g t^2 h = 4.9 (2.03)^2 h = 20.4 meters

**Science**

same Justin the whole tie amount of tissue needed depends on type of tissue used pulse rate is the dependent variable and I do not know why you say it is not write as: pulse rate = f(music type) see definition:http://dictionary.reference.com/browse/dependent+variable

**physics**

final momentum = 4.7 (1000+2200)=15040 initial momentum = 1000 v so v = 15.04 m/s

**physics**

a liter is 10^3 = 1000 cm^3 so we have 22.4 * 1.5 = 33.6 moles of gas at 273 deg K and 100 kPa P V = n R T n and r remain the same so P1V1/T1 = P2V2/T2 100 (1500)/273 = P2 (1000)/253 P2 = 139 kPa ABSOLUTE pressure - 100 KPa for gage = 39 k Pa gage

**Algebra**

Here is a combinations and permutations calculator to get permutations, the "Is order important" box should be YES to get combinations the is order important box is NO http://www.mathsisfun.com/combinatorics/combinations-permutations-calculator.html Here you are doin...

**HELP!!!! MATH**

LOL, I would have had the 15 degrees from horizontal, living on the bleak ocean where at least a seven to one scope is required.

**geometric**

No C) foot

**geometric**

Given those English unit choices, I think foot is the correct choice. A standard shipping container is 20 feet long but most these days are double that, 40 feet long.

**Physic**

x = A sin w t v = A w cos wt a = -w^2 A sin wt = -w^2 x so A w = .438 or w = .438/A A w^2 = 1.53 so A *(.438)^2/A^2 = 1.53 so 1.53 A = .192 A = .125 m

**One last math question**

1/2 - 1/9 = 9/18 -2/18 = 7/18 18 * 7/18 = 7 2/3 - 1/6 = 4/6 - 1/6 = 3/6 = 1/2 9 * 1/2 = 9/2 so 7+9/2 = 14/2+9/2 = 23/2 then 23/2 / (5/2) = 23/5 = 4 3/5

**math**

Draw a sketch of the ten tables in a row. Only two people can sit at the middle ones because the ends are up against the next tables. for the two tables on the end, the usual two can sit plus one on each end of the whole line

**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

**algebra**

h(m+1) = 2 f f = h(m+1)/2

**5th Grade ADV. Math**

You are welcome :)

**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

**5th Grade ADV. Math**

That did not line up right, but I hope you see the point

**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

**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

**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

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