Friday

July 1, 2016
Total # Posts: 26,400

**math help please**

20 + 5 + 20 + 5
*January 12, 2016*

**physics**

LOL - I guess unless the string breaks they better have the same acceleration force of m1 down slope = 3.7 g sin 30 = 1.85 g force of m2 the other way = 2.3 g net force = (2.3 -1.85)g = .45 * 9.81 = 4.41 N block 2 wins and heads straight down, block 1 heads up slope a = 4.41...
*January 12, 2016*

**Algebra II**

well, I suppose I would check -125^4/3 -125^1/3 = -5 then(-5)^4 = 625 so it looks like you are right to me
*January 12, 2016*

**Calculus AB**

Ah, so you have heard the words "mean value theorem" now let's see what the slope is from x = 1 to x = 2 y(2) = |(-2)(6)| = 12 y(1) = |(-5)(3)| = 15 so slope = -3/1 = -3 Mean value theorem says slope must be 3 at least once between = 1 and x = 2 lets look at ...
*January 12, 2016*

**Calculus AB**

Here you go http://www.sosmath.com/calculus/diff/der11/der11.html (mean value theorem)
*January 12, 2016*

**Calculus AB**

DRAW A GRAPH !!! somehow a smooth curve has to get from 4 at -3 back to 4 at +4 It could be a horizontal line, but that is a trivial case It could start up, but then would have to come down. SO HAS TO HAVE SLOPE of ZERO in here at least once if it started down, it has to come ...
*January 12, 2016*

**us history. Plz help!**

Well where is Louisiana and the Mississippi valley on your map ?
*January 12, 2016*

**us history. Plz help!**

3 is wrong. The United States did not exist when France was fighting England and us in the north east. I suspect they mean Louisiana purchase 5 wrong remember slavery etc at the time period 7 - I do not remember, assume you are right 9 I guess 11 no 12 - need for strong ...
*January 12, 2016*

**math help**

45 min + 30 min = 75 min = 1 hour and 15 min = 1.25 hr 9 - 1.25 = 7.75 which is 7:45 am
*January 12, 2016*

**Math**

2.5 gal (4 qt/gal) = 10 qt
*January 12, 2016*

**math help**

70/2
*January 12, 2016*

**math**

3 * 5.5 = 16.5 = 17
*January 12, 2016*

**math**

if n is 12 then n+6 is 18
*January 12, 2016*

**Conversion**

if it is 10 seconds I suspect 110 yards :) 1760 yd/mi 3600 s/h 110 yd/10 s (1 mi/1760 yd)(3600s/h) = 22.3 mi/h
*January 12, 2016*

**PHYSICS 1**

if your angles are math convention, counterclockwise from x axis and not compass angles from north then just use what Steve gave you for A Ax = 145 cos 190 Ay = 145 sin 190 etc
*January 12, 2016*

**math**

4.5 / 60
*January 12, 2016*

**6 is right**

You got one, enough already
*January 12, 2016*

**Random selections?**

4 C Hey have you just picked random answers?
*January 12, 2016*

**Math**

3D wrong, solution is y = 0 but what about 0 x = 0 in 2C ?
*January 12, 2016*

**Math**

2. Same mistake 5 x = + 40
*January 12, 2016*

**Math**

1) no 16 - 9 = +7
*January 12, 2016*

**Please try to do these before asking**

We are here to help, not to do your work for you. Try first
*January 12, 2016*

**math**

I just answered this http://www.jiskha.com/display.cgi?id=1452632926
*January 12, 2016*

**Math**

2 L + 2 w = 30 L = 4 w ======================== 2(4 w) + 2 w = 30 10 w = 30 w = 3 so L = 12 and A = 3 * 12 cm^2
*January 12, 2016*

**Language Arts - Please Help!**

1. I would pick B. It follows line by line the poem. 6. It says rhythym, not rhyme 7. I have no idea. 9. the second half can stand independently.
*January 12, 2016*

**Grade 5 math**

16 * 75 = ??? cm divide cm by 100 to get meters
*January 12, 2016*

**msth**

10 x + y x = 3+5 = 8 8 = 2 y so y = 4 80 + 4 = 84
*January 12, 2016*

**Math**

yes, you are welcome.
*January 12, 2016*

**Math**

2.6 + 6.03 + 2.6
*January 12, 2016*

**Algebra**

I do not see your answers.
*January 12, 2016*

**maths**

LOL you need more than that side side side? side angle side? angle side angle? or something
*January 12, 2016*

**Math**

1. yes 2. yes 3. no 9-12 = ? 4. five less is x-5 it can be equal to 9 or x-5 = 9 or it can be greater than 9 or x-5>9 so x - 5 >/= 9 which I believe is A
*January 12, 2016*

**Algebra**

y = (-3/4) x + 2 y = (+3/4) x + 2 slopes are -3/4 and +3/4 if they were the same, then parallel if one were - 1/the other, then perpendicular so neither
*January 12, 2016*

**math**

45 x = 100 + 25 x
*January 12, 2016*

**SS HELP!**

Which answer uses the word "Rights".
*January 12, 2016*

**SS HELP!**

1. No 2. yes 3. yes 4. I am not familiar with Georgia constitution but wonder if the conduct negotiations with Germany
*January 12, 2016*

**History**

neither
*January 12, 2016*

**History**

The assumption that "Most people know ... " is a hint of bias of course.
*January 12, 2016*

**History**

No, but we do not see what is in the article you read.
*January 12, 2016*

**Math**

yes
*January 12, 2016*

**Social studies**

Look at a globe or map !!!!!
*January 12, 2016*

**Social studies**

I would not pick d. That covers all of Europe and Africa :)
*January 12, 2016*

**Social studies**

For example: Israel, Jordan, and Lebanon. Saudi Arabia, Iraq,Iran Egypt, Turkey. ============================= find them :) by the way I am sure that they are all south of the arctic and north of the south pole, but that does not locate them satisfactorily.
*January 12, 2016*

**Math**

13891885.31 approximately
*January 12, 2016*

**Math**

220/8 = 27.5 225/5 = 45 do the others the same way and see which is the most words/minute
*January 12, 2016*

**Math**

Which ratio is equivalent to 4/16 A. 2:4•• B. 6 to 20 C. 8:32 D. 12 to 64 ===================== no 2/4 = 1/2 4/16 = 1/4 the only one with a denominator four times the numerator is 8/32 C.
*January 12, 2016*

**I am not sure**

I guess I would start with a Google search, maybe on napkin dye safety or just paper dye safety or something. I am not sure they are any more dangerous though.
*January 12, 2016*

**Wait a minute**

What am I thinking? The RANGE is the amount in the account. The DOMAIN is the date :)
*January 12, 2016*

**Algebra 2**

However it would not include 51.473 so 100 * entry is integer
*January 12, 2016*

**Algebra 2**

Why would it be integers? $ 51.47 for example I suppose it could be negative if your bank has some sort of policy covering your bad checks.
*January 12, 2016*

**math**

2 x^2 = 100^2 ? x^2 = 5,000 x = 70.7 feet if you want the sides of a square with 100 ft diagonal
*January 12, 2016*

**I do not understand**

Is this the diagonals of a square or something and you want the sides?
*January 12, 2016*

**Math**

(3/7)(3/3) = 9/21 sure enough :)
*January 12, 2016*

**Math**

Cute problem :)
*January 12, 2016*

**Math**

log 2 (-3sin x) -log2 (cos^2) x =1 log 2 [ -3 sin x/cos^2 x = 1 -3 sin x / cos^2 x = 2^1 = 2 sin x/cos^2 x = -2/3 well the sin must be negative so x is between pi and 2 pi well try sin x/(1 - sin^2 x ) = -2/3 let z = sin x z/(1-z^2) = -2/3 3 z = -2 + 2 z^2 2 z^2 - 3 z - 2 = 0...
*January 12, 2016*

**Math**

5h - 9 = -16 + 6h subtract 5 h from both sides - 9 = - 16 + 1 h add 16 to both sides 7 = h the end
*January 12, 2016*

**Social studies**

LOL - I would have picked A. Jews, Christians of all sorts in Syria and Lebanon and Armenia (if any survive) and Egypt .... But probably C is the expected answer.
*January 12, 2016*

**of**

1 12/60 hours = 1.2 hours 50 km/h * 1.2 h = 60 km
*January 12, 2016*

**math**

so A total = 32 x^2 sqrt 3/.75 so 32 x^2 sqrt 3/.75 = 19200 sqrt 3 x^2 = 450 x = 21.2 check my arithmetic
*January 12, 2016*

**math**

If you draw it you can see that An = An-1 * .25 or a , .25 a , .25^2 a etc we have a sum of a geometric series here with r = .25 see http://www.mathsisfun.com/algebra/sequences-sums-geometric.html the first term a is area of triangle with 8 x sides a = 2 * 4x * 4x sqrt 3 = 32 ...
*January 12, 2016*

**machanics**

G m M/r^2 = m v^2/r so G M/r = v^2 M = (4/3)rho r^3 G(4/3) rho r^2 = v^2 T = 2 pi r/v v^2 = (2 pi)^2 r^2/T^2 so G(4/3) rho = (2 pi/T)^2
*January 12, 2016*

**Physics**

450 * 2 = 900 Joules
*January 12, 2016*

**Physics**

Depends if they are vertical and symmetric about the cg if so 100/8
*January 12, 2016*

**Physics**

F = .5 m g = .5 * 35 * 9.81 Newtons
*January 12, 2016*

**Physics**

PE = 31 * 9.81 * 1.92 Joules at bottom (1/2) m v^2 = PE suspect C wants work done which is the same as the PE again
*January 11, 2016*

**yes**

If the tree were INCREASING there would be less CO2 released to the atmosphere. So you are right.
*January 11, 2016*

**math**

300/330 = .91 1 - .91 = .09 .09 * 100 = 9 %
*January 11, 2016*

**Physics**

with F = m a f cos 38 = .788 F again a = change in velocity/time = 2.2/time but time = distance/average speed = 3.4 /1.1 = 3.09 seconds so a = 2.2/3.09 = .712 m/s^2 so .788 F = 12 * .712 F = 10.8 Newtons (remarkable)
*January 11, 2016*

**Physics**

You can do it with work if you wish or you can do it with F = m a with work work done = Force in direction of motion * distance Force in direction of motion = F cos 38 = .788 F work done = .788 F * 3.4 meters = 2.68 F Joules that is the increase in kinetic energy (1/2) m v^2...
*January 11, 2016*

**so what is the question**

Are you doing geometric sequences? Fractals ? whatever ?
*January 11, 2016*

**us history**

If you go east from Florida you go to Africa.
*January 11, 2016*

**Math watch addition**

45 min for lunch so 6 hrs and 85 minutes I hour = 60 minutes so you have 7 hours 20 minutes I think 25 minutes
*January 11, 2016*

**Math**

driving 6.5 hr gas 1/6 hr lunch 3/4 hr sum = 7.41666666... hr = 7 hours + .416666.. * 60 min = 7 hours and 25 minutes so that is 5 hours to noon + 2 hours 25 minutes before noon sounds like 9:35 am
*January 11, 2016*

**Physics**

F up = 119 sin 31 = 61.3 N F x = 119 cos 31 = 102 N normal force = m g - 61.3 = 22.5*9.81 - 61.3 = 159 N friction force = .72*159 = 115 N They did not ask for the horizontal acceleration?
*January 11, 2016*

**math**

x of them were there x/4 after an hour x/4 - 20,000 after two hours that is x/12 so x/12 = x/4 - 20,000 3 x/12 - x/12 = 20,000 x/6 = 20,000 x = 120,000 big game
*January 11, 2016*

**math**

if 3 + 4 i is a solution then its complex conjugate 3 - 4 i is also a solution because when you solve a quadratic for example (- b +/- sqrt(b^2-4ac))/2a if b^2-4ac is negative then you have -b + number*i and -b - same number*i They come in complex conjugate PAIRS
*January 11, 2016*

**better link**

http://www.khanacademy.org/science/chemistry/acid-base-equilibrium/copy-of-solubility-equilibria-mcat/v/solubility-product-constant-from-the-solubility
*January 11, 2016*

**Dr Bob - Kayla needs you :)**

I am just plodding through this
*January 11, 2016*

**math/ chemistry**

so you have 1.72 * 10^-3 g /100 mL which is 17.2 * 10^-3 g/liter ten times as much because 1000mL is 1 liter how many mols is 17.2 * 10^-3 g 17.2*10^-3 g/L / 62 g/mol = .277 * 10^-3 mol/Liter 2.77 *10^-3 mols/Liter or M Now to get from there to Ksp I suggest looking at https...
*January 11, 2016*

**math/ chemistry**

there are 1000 cubic centimeters which is 1000 grams of water (close enough) in a liter which is 10 cm * 10 cm * 10 cm now I do not know what chemical you are using that is 62 grams/mol You better give me the whole problem carefully because unless you know M, the molarity, you...
*January 11, 2016*

**Math forum link**

http://mathforum.org/sum95/suzanne/whattess.html
*January 11, 2016*

**yes**

Yes, yes, yes I love it !!!
*January 11, 2016*

**Math**

4 + 5 = 9 4/9 5/9
*January 11, 2016*

**BUT**

which of those is the key to FAILURE of modern civilizations?
*January 11, 2016*

**History**

Nile, Indus, Tigris, Euphrates, Yellow, Mekong ........ Oh, Belarus Volga, Oxus ....
*January 11, 2016*

**Math**

4 s + 6 h = 52 2 h = 1 + s so 6 h = 3 + 3 s ========================= ====================== so 4 s + 3 + 3 s = 52 7 s = 49 s = 7 well that was easy
*January 11, 2016*

**Now way no way no way at all**

Now how can I be 10 years old and 4 years before birth at once :( Those are two parallel lines, they never cross. THERE IS NO SOLUTION !!!!
*January 11, 2016*

**yes**

yes
*January 11, 2016*

**us history**

I love using Mother Jones as my primary source.
*January 11, 2016*

**us history**

Google Mother Jones Haiti Napoleon Louisiana I already used it today :)
*January 11, 2016*

**us history**

Google will settle that in no time :)
*January 11, 2016*

**Math**

well, 1/4 of what it all cost last week so'last week 8000 + 2040 + 8400 = 18,440 so this week 18,440/4
*January 11, 2016*

**Physics**

d is the same for both I will do F d^2 so you see which wins :) gravity Fg * d^2 = G M1 M2 = 6.673*10^-11 * (1.673*10^-27)^2 = 18.7 * 10^-65 electrostatic Fe d^2 = k Q1Q2 = 9*10^9 (1.6*10^-19)^2 = 23 * 10^-29 it is 10^-65 for gravity and 10^-29 for electricity Electricy wins ...
*January 11, 2016*

**Physics**

if a = 0 F = m g = (91)(9.8) = 892 N a = 1.7 m/s / 1.07 s = 1.59 m/s^2 Fup - mg down = m a = 91(1.59) Fup = 892+145 = 1037 N constant speed, no acceleration so back to m g = 892 892 -91(1.67/t) and 0 = 1.7 - 1.67 t t = 1.02 seconds to stop so 892 - 91 (1.67/1.02) = 743 N
*January 11, 2016*

**physics**

a = change in v / change in time = (12-2)/2 = 5 m/s^2 m Vi = 1500 * 2 = 3000 kg m/s m Vf = 1500 * 12 = 18,000 kg m/s 18,000 - 3000 = 15,000 kg m/s F = rate of change of momentum = m a do both ways F = 15,000/2 = 7,500 N or F = 1500 * 5 = 7,500 N remarkable LOL Now What Newton ...
*January 11, 2016*

**us history**

I do not think so, but you are entertaining. I am from Cape Ann where we had few slaves and 15 year old girls helped their mothers.
*January 11, 2016*

**us history**

The wrong ones are a riot !
*January 11, 2016*

**Math-Algebra**

Just try them, and did you catch the error in your previous problem way below, scroll down as for this 2(4) -5(-3) = 8 + 15 yes, ok 2(-5/3) -5(5) = 10/3-25 NO, way too small 2(5)-5(3/4) easy bigger than 6 etc
*January 11, 2016*

**us history**

yes
*January 11, 2016*