Wednesday

September 3, 2014

September 3, 2014

Total # Posts: 18,248

**geometry**

2 2 3 3 3 1
*August 16, 2014*

**Math**

by "right" do you mean "right triangle" ? If so then tan B = b/a B = tan^-1 (b/a)
*August 16, 2014*

**calculus**

Hey, you are doing great ! These last two were harder than the ones you asked for help with.
*August 16, 2014*

**calculus**

good, that is a long one :) add, then multiply, then add
*August 16, 2014*

**calculus**

3 min = 180 seconds downstream = 5 * 180 across = 12 * 180 hypotenuse = sqrt (across^2 + downstream^2)
*August 16, 2014*

**calculus**

in the x direction 6 * 1 = 6 int the y direction 2 * -4 = -8 in the z direction 0 * 1 = 0 6 + -8 = -2 see: http://www.mathsisfun.com/algebra/vectors-dot-product.html to see how to do it with |A| * |B| * cos theta
*August 16, 2014*

**Physic**

hard to say without knowing the volume. duck it in a full cup and measure the amount of water that flows over the lip.
*August 16, 2014*

**Physics 2**

Hard to say without knowing the distances... In general F = k Q1 Q2 /|R^2| iin direction of R If horizontal length = a and vertical height = h Q is lower right Q1 is lower left Q2 is upper left Q3 is upper right R is vector from Q to one of the other 3 Rx = x component of R Ry...
*August 16, 2014*

**Algebra**

I am not sure your superscript shows up on everyone's screen. 5 (14-20)^2 /2 = 5 * 36 /2 = 5 * 18 = 90
*August 16, 2014*

**physics, mit 2.01x, mechanical engineering**

If you tried to copy and paste the drawing or sketch of this truss here, it did not work because copy and paste is not allowed here. From what you said, moment of inertia of the cross section must be increased or length of section reduced assuming you are doing Euler column ...
*August 15, 2014*

**math**

how many buggies? 21 = 9 + 3 n n = 4 4*4 = 16 21 - 16 = 5
*August 14, 2014*

**Math**

1+2+3 average is (1+3)/2 = 2 2*3 = 6 check :) so I think it is (1+31)/2 = 16 16*31 = 496
*August 14, 2014*

**math**

-2 = -1/.5 so they are perpendicular, yes, C
*August 14, 2014*

**math corrections**

profit, p = revenue, r - cost, c r = revenue = 25 g c = cost = 75 so p = 25 g - 75 so if p >/= 50 then 25 g - 75 >/= 50 so you are right. It is E.
*August 14, 2014*

**math**

4.85/4 = 1.21625 = quarterly percent 11 years = 44 quarters (1.0121625)^44 = 1.7022 3,500 * 1.7022 = 5957.70 so agree. I do not see any list of staetements
*August 14, 2014*

**mathematics**

x+6
*August 14, 2014*

**math corrections**

I agree with your answer, C and have no idea why it is called incorrect.
*August 14, 2014*

**math corrections**

1, 5c 2 10 c 3, 15 c 4, 25c 5 30C 6 35 c 7 40 c 8 50 c 9 55 c 10 60 c 11 65 12 75 c 13 80 c 14 85 c 15 90 c
*August 14, 2014*

**math**

4000/7 = 571.4 so we need a little more than 571 572 will do 572 * 7 = 4004, check :)
*August 14, 2014*

**math**

5 28 = 300 + 28 = 328 6 43 = 360 + 43 = 403 sum = 731, agree
*August 14, 2014*

**Finance**

If your in county prices go up so you must pay more of your coins for a banana, then your coins will buy fewer of my bananas and is worth fewer of my coins which can still buy as many bananas as they did last year.
*August 14, 2014*

**fundinjobo high science**

H2 is 2 grams/mol so we have 40 mols of H2 which is 80 mols of H for each mol of H we get 1/3 mol of NH3 so we get 80/3 mols of NH3 NH3 is 14+3 = 17 grams/mol (80/3)mols * 17 grams/mol = 453 grams NH3
*August 14, 2014*

**math**

y = 14 t - 4.9 t^2 if you do not know physics or calculus you must complete the square to find the vertex of the parabola. 4.9 t^2 - 14 t = -y t^2 - 2.857 t = -(1/4.9) y t^2 - 2.857 t + 1.429^2 = -(1/4.9)y+2.04 (t-1.429)^2 = -(1/4.9)[ y - 10 ] vertex at height 10 meters and ...
*August 14, 2014*

**history**

http://history.howstuffworks.com/revolutionary-war/hartford-convention.htm B. mainly ports for international trade. (Boston, Philadelphia, New York, Charleston, the ports in Va and MD ....... Hey, Google this stuff !
*August 14, 2014*

**history**

....... from Albany to ______ Oh well :(
*August 14, 2014*

**math**

What are you talking about? 15,000 (1 + 0.10/12)^12n for 6 years 15,000(1.008333)^72 = 15,000*1.8176 = $ 27,263.91 for 12 years 15,000 (1.008333)^144 = $49,554.73 etc
*August 14, 2014*

**math**

4 s = 20 s = 5
*August 14, 2014*

**maths probably typo but all right here is your cost**

I suspect you men .10 or 1.0 times 8 per mile not $10 per (1/8) mile but since you used 10 I will go along with $80 per mile c = 1.8 + 80 m c(4.5) = 1.8 + 80 (4.5)
*August 14, 2014*

**Maths**

.75 fruits = orange or .75 f = oj .25 fruits = apples or .25 f = a oj - 10 = .5 a so .75 f - 10 = .125 f .625 f = 10 f = 16 answer now check 12 + 4 = 16 yes 12 - 10 = 2 2 = half of 4 yes
*August 14, 2014*

**maths parentheses? might as well be Martian**

I can not decipher your text right off for example (36/25)^(3/2) or [36/(25)^3]/2 or what, no hope unless you use parentheses properly
*August 14, 2014*

**Math**

if y = a x^n then dy/dx = a n x^(n-1) so if y = 2400 x^1 - 2 x^2 then dy/dx = 2400 (1) x^(1-1) - 2 (2) x(2-1) or dy/dx = 2400 x^0 - 4 x^1 which is dy/dx = 2400 - 4 x
*August 14, 2014*

**math**

try volume Vnew = (x+2)(x+2)(x+2) big mess try area Anew = (x+2)(x+2) = x^2 + 4 x + 4 not this for sure try that perimeter thing how many edges? 4bottom +4top +4verticals = 12 edges 12 * 2 = 24 !!! winner
*August 14, 2014*

**maths**

suspect you mean 0.10 per 1/8 mile or 0.80 per mile c(n) = 1.80 + .8 n c(4.5) = 1.80 + .8 (4.5)
*August 14, 2014*

**maths**

I told you.
*August 14, 2014*

**maths**

surface area = area of base and top (same for both) + height*2 pi r so not the same and not twice volume = area of base * height ah ha, twice if you double height
*August 14, 2014*

**Statistics**

combinations of 15 taken six at a time 15!/ [6! (15-6)!] 15! /(9! 6!) 15*14*13*12*11*10 / (6*5*4*3*2) 7*13*11*5
*August 14, 2014*

**maths**

2.25 times volume = area of base * height height the same base 1.5*1.5 = 2.25
*August 14, 2014*

**Physics**

change in potential energy = m g h = work done = 2180 Joules/second * t
*August 14, 2014*

**Physics**

r omega^2 = 9.81 m/s^2 r = (6.9/2)*1000 = 3450 m so omega^2 = 9.81/3450 omega = .0533 radians/s (that is about 118 seconds /revolution or about 2 minutes per revolution)
*August 14, 2014*

**Physics**

force * time = change in momentum = m v
*August 14, 2014*

**physics**

x displacement = 50 cos 90 + 50 cos 245 = 0 -21.43 y displacement = 50 sin 90 + 50 sin 245 = 50 -45.3 = 4.68 displacement = sqrt (-21.4^2+ +4.68^2) = 21.9 meters x is negative and y is positive so quadrant 2 tan angle above x axis = tan^-1 y/-x = tan^-1 4.68/21.43 = 12.3 deg ...
*August 13, 2014*

**math**

25 + 12*15 = 205 .12 * 205 = 24.60 saved
*August 13, 2014*

**Algebra**

either way. (a*b)/c = (b/c)a = a b / c
*August 13, 2014*

**algebra**

Please, please, try to use standard notation Do you mean (3-s)^(1/3) = 3 ??????? if so raise both sides of the equation to the third power (3 - s)^1 = 3-s = 27 s = 3 - 27 s = -24
*August 13, 2014*

**mathematics (word problems)**

.5 x + .25 x = monitor + modem .25 x remains so .25 x = 200 + 150
*August 13, 2014*

**whoops**

(m-1/4)(.8) = 3 - 1.2
*August 13, 2014*

**math**

0.10 per 1/8 mile = 0.8 per mile miles = m (m - 1/4 ).10 = 3.00 - 1.20
*August 13, 2014*

**math**

volume of box = 4*3*2 = 24 ft^3 volume of brick = 8/12 *4/12 * 2/12 = 2/3 * 1/3 *1/6 = 1/3 * 1/3 *1/3 = 1/27 ft^3 24/ (1/27) = 648
*August 13, 2014*

**Math**

You try first.
*August 13, 2014*

**math**

17 * 10^-6 mm .0 0 0 0 1 7 move that dot 6 places right and you get 17
*August 13, 2014*

**English**

http://www.sparknotes.com/lit/flies/section12.rhtml
*August 13, 2014*

**Geometry: Area and Volume Math**

I mean volume of sphere :)
*August 13, 2014*

**Geometry: Area and Volume Math**

length in cm or meters or feet or elbows or thumbs area in cm^2 or m^2 or ft^2 or elbows^2 or thumbs^2 volume in cm^3 or m^3 or ft^3 or elbows^3 or thumbs^3 areas = multiple of two lengths volumes = multiples of three lengths of course those lengths might be the same for ...
*August 13, 2014*

**Geometry: Area and Volume Math**

length * width * height 6 * 6 * 6 = 6^3 = 216
*August 13, 2014*

**math**

sin Angle = 10/20 = .5 as we all know sin 30 degrees = .5
*August 12, 2014*

**help AGAIN**

Hopefully curiosity leads to an explanation. Hopefully sincerity leads to trustworthiness.
*August 12, 2014*

**physics**

time for phase 1 = 7/9.5 = .737 hr time for entire trip = 23/22 = 1.045 hr time for 16 km = 1.045 - .737 = .308 hr speed for 16 km = 16/.308 = 52 km/hr
*August 12, 2014*

**chemistry**

P V = n R T V = n (R T/V0 so volume is proportional to number of mos if P and T are constant we need three mols of H2 for every mol of N2 so there is exactly the right amount of each for every mol of N2 we will get 2 mol of NH3 so for every mL of N2 we will get 2 mL of NH3 so ...
*August 12, 2014*

**algebra**

ok, I will try but very confusing -5 (assume x here means times, not x) -5[1/(3x+4)]^(1/3) = -10 ??????? or [1/(3x+4)]^(1/3) = 2 1/(3x+4) = 8 8(3x+4) = 1 24 x + 32 = 1 24 x = -31 x = -31/24 or do you mean -5 [(1/3)x +4 ]^(1/3) = -10 or [(1/3)x +4 ]^(1/3) = 2 ?????? (1/3) x + 4...
*August 12, 2014*

**algebra**

You notation is very hard to follow. Do you mean [ 1/(2n+3) ]^(1/4) = 3 ??? if so 1/(2n+3) = 81 81 (2n + 3) = 1 162 n + 243 = 1 162 n = -242 n = - 1.49
*August 12, 2014*

**Math**

This question could have been written another way around. Lets see how many friends Adrienne is can spend 5 dollars on in addition to spending 75 on the rental for amount in her budget c f = (c - 75)/5 NOW f depends on c but the equation is really the same 5 f = c - 75 or 75+...
*August 12, 2014*

**Math**

c = 75 + 5 f cost c depends on number of friends f
*August 12, 2014*

**Math**

ROTFL anything to the zero power is ONE one to one hundred or whatever is ONE 3^27 * 3^-9 = 3^18
*August 12, 2014*

**math PLEASE HELP**

You are welcome :) by the way 366/7 = 52 remainder 2 days Sunday - Monday is one Monday - Tuesday is two so we land there on Tuesday
*August 12, 2014*

**math PLEASE HELP**

LOL 2012 was a leap year beginning on Sunday http://www.calendarlabs.com/online-calendar.php?y=2012 Tuesday
*August 12, 2014*

**physics**

I have no idea what the statement is but in general if you drop something with no initial speed v = sqrt (2 g h) where h is height in meters g = 9.81 m/s^2 on earth v is in meters/second If you used copy and paste, it does not work here and I can not see your problem.
*August 12, 2014*

**MATH**

.5 x for film , .5 x left .25 * .5 x = .125 x on refreshments so .5 x - .125 x = .375 left for the book so .375 x = 7.50 x = 20 dollars
*August 12, 2014*

**PLEASE HELP WITH MATH**

You are welcome.
*August 12, 2014*

**PLEASE HELP WITH MATH**

If the clock spun backwards, then 20 minutes before any hour the minute hand would point to 4 assuming that the numbers remained painted on the dial as they are now.
*August 12, 2014*

**algebra**

Do you mean (1/3) + 5/(s-4) = 2 ???? if so then multiply everything by 3(s-4) (s-4) + 15 = 6(s-4) 15 = 5 (s-4) 3 = s-4 s = 9 Yes, I agree all the way.
*August 12, 2014*

**algebra**

k + 5 = -6/k k^2 + 5 k = -6 k^2 + 5 k + 6 = 0 NOTE - we have a sign problem (k+2)(k+3) = 0 k = -2 or k = -3
*August 12, 2014*

**algebra**

suspect you mean (2x+3)/x = (x+5)/2 multiply everything by 2x 4 x + 6 = x^2 + 5x x^2 + x - 6 = 0 (x-2)(x+3) = 0 x = 2 or x=-3 note I have a problem with your transition from your line two to line three 2(2x+3)=x(x+5) 4x +6=x^+5 should be 4 x + 6 = x^2 + 5x
*August 12, 2014*

**geometry**

1 m / 2 cm 14 cm (1 m / 2 cm) = 7 m 20 (1/2) = 10 m 7 (1/2) = 3.5 m
*August 12, 2014*

**Math**

14 = 7*2 always :) (x-7)(x+2) ------------------ b(Ab+3) ----------------- suspect you mean a^3-8a^2+15a which is a (a^2-8a+15) but we know 15 = 3 * 5 and 3+5=8 :) so a (a-5)(a-3)
*August 12, 2014*

**math**

circles are all geometrically similar to each other so all lengths scale the same. Both the diameter and the circumference are lengths. (1/2) 8 = 4
*August 12, 2014*

**arithematic**

1000 = (v+c)15 = 15 v + 15 c 1000 = (v-c)30 = 30 v - 30 c ------------------------------- 2000 = 30 v + 30 c 1000 = 30 v - 30 c ------------------ subtract 1000 = 60 c etc
*August 12, 2014*

**Algebra**

5 + 4 (2)^2 = 5 + 4 (4) = 5 + 16 = 21
*August 12, 2014*

**Algebra**

(4 * 1/10)^3 = 64 * 1/1000 = .064
*August 12, 2014*

**Algebra**

2*2*5 x^5 u^7 and 2*2*7 x^3 v^2 u^4 4 x^3 u^4
*August 11, 2014*

**Analytic Geometry**

sketch it first then find the lengths of the sides for example c^2 = 2^2 + 6^2 = 40 c = 2 sqrt 10 then use law of cosines a^2 = b^2 + c^2 - 2 b c cos A
*August 11, 2014*

**Analytic Geometry**

intersections: x^2 + y^2 - 2x - 2y -2 = 0 x^2 + y^2 + 2x + 2y -2 = 0 ---------------------------subtract -4x -4y = 0 x = - y so along that line of slope -1 now where does x = -y on either circle? 2 y^2 + 2y -2y = 2 y^2 = 1 y = +/- 1 x = -/+ 1 in other words at (-1,1) and (1,-1...
*August 11, 2014*

**Analytic Geometry**

I think you mean "VERTICES" or "corners" in geometry where two straight lines meet.
*August 11, 2014*

**math**

5^3 - 2^3
*August 11, 2014*

**math**

so this time they add to 90
*August 11, 2014*

**math**

supplementary angles add to 180 93 + x = 180 or x = 180 - 93
*August 11, 2014*

**physics**

250 (1000/3600) = 69.4 m/s v = Vi + a t 0 = 69.4 -10t t = 6.94 seconds to stop d = (1/2) a t^2 = (1/2)(10)(6.94^2) = 241 meters
*August 11, 2014*

**statistics gibberish**

Please proof read does body mean boys? what is 60 kg ? who got hired for what? http://davidmlane.com/hyperstat/z_table.html
*August 11, 2014*

**Algebra**

2 v^2 + 4 v - 14 = v^2 + 2 v + 1 v^2 + 2 v - 15 = 0 (v+5)(v-3) = 0 v = 3 or -5 the next one is easy
*August 11, 2014*

**Algebra**

L = 7 + 2 w L w = 99 (7+2w)w = 99 2 w^2 + 7 w - 99 = 0 (2w -11)(w+9) = 0 w = 11/2 L = 7 + 11 = 18
*August 11, 2014*

**chemistry**

By the way molecules of He is the same as atoms of He because there is one atom per molecule. If it had been H2 or O2 there would have been twice as many mols of atoms as mols of molecules.
*August 11, 2014*

**chemistry**

3 times Avagadro's number = 3 * 6.022 * 10^23 = lots of them Hey saying you have a mol of something is the same as saying you have 6*10^23 of them. It is sort of like if you say you have a dozen everyone knows you have twelve.
*August 11, 2014*

**Calculus-Math**

dC/dt = dC/dx dx/dt = 60 dx/dt = 60 [ 3(-1.637) t^2 etc
*August 11, 2014*

**Algebra**

2*3*5* w^4 * v^8 and 2*2*2*3 * y^3 * w^6 *v^2 2*3* w^4 *v^2 or 6 w^4 v^2 is all that is common
*August 11, 2014*

**Algebra**

I just did this about one minute ago. Stop spamming.
*August 11, 2014*

**Geometry**

NO lots of things with 4 straight sides are not rectangles but squares are.
*August 11, 2014*

**Algebra**

You are welcome.
*August 11, 2014*

**Algebra**

w (9-w^2) second factor is difference of squares in general a^2-b^2 = (a-b)(a+b) so w (3-w)(3+w) or -w (w-3)(w+3)
*August 11, 2014*

**physics**

Ah, ha, there was more. initial south momentum = 900 v initial west momentum = 2000 u final south momentum = 2900(16)cos 24 final west momentum = 2900(16)sin 24 so 900 v = 46400 (.9135) and 2000 u = 46400 (.4067)
*August 11, 2014*

**algerbra**

draw a number line from way left to way right +54 - (-17) = 54+17
*August 11, 2014*

**Maths literacy**

base times height. It is the same as a rectangle with a triangle taken off one end and tacked to the other end. Draw it.
*August 11, 2014*

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