Thursday

November 26, 2015
Total # Posts: 22,915

**Physics**

hey look v = Vi - g t h = Hi + vi t - 4.9 t^2 u = horizontal velocity = constant by the way
*September 8, 2015*

**Algebra**

-1 + 2/5 is not 2/5 However 2 + 2/5 IS 2 2/5
*September 8, 2015*

**geometry**

4.0 - 2.8
*September 8, 2015*

**Basic Banking Operations**

700 * 12.25 = 8575
*September 8, 2015*

**english 9**

http://www.kshs.org/kansapedia/mary-elizabeth-lease/12128
*September 8, 2015*

**Physics**

a = v^2/r a' = v^2/(r/2) = 2 v^2/r = 2 a
*September 8, 2015*

**Math**

as x gets big +, y ---> 0 as x gets big -, y----> -0 as x ----> -2 , y------> 0 as x ---> 0 , y ----> oo GRAPH IT !!!!
*September 8, 2015*

**Integrated math 1**

1 3 5 7 9 11 13 15 17 19 21 23 25 27 - **--- **------** ------** ----- ** looks like one out of three odd numbers is divisible by 3 so 1/3
*September 8, 2015*

**english 9**

http://www.infoplease.com/encyclopedia/society/americanization.html
*September 8, 2015*

**MATH-Please Help me**

12/4 = 3 times as much 3 * 3 = 9
*September 7, 2015*

**science!**

2. write a hypothesis for this experiment. my answer: if the students compared the growth of the spanish needle seeds with sunlight to other lights, then sunlight will show the best results. =================================== Are you sure? Sunlight is your control and maybe (...
*September 7, 2015*

**Math**

h = (1/2) g t^2 if using feet g = 32 ft/s^2 or h = 16 t^2 t - (1/4) sqrt h
*September 7, 2015*

**chemistry**

C9 H8 O4 9*12 + 8*1 + 4*16 = 180 grams/mol .0137*180 = 2.47 grams
*September 7, 2015*

**math**

10 8,000 + 200 + 30 + 4 versus 800 + 20 +5
*September 7, 2015*

**physics**

v = Vi - g t at top v = 0 0 = 13.3 - 9.81 t t = 1.36 seconds to top h = Hi + Vi t - 4.9 t^2 h = 0 + 13.3 * 1.36 - 4.9 (1.36)^2 h = 18.1 - 9.06 h = 9.03 meters when is it at 4.52 meters? 4.52 = 13.3 t - 4.9 t^2 t^2 - 2.71 t + .922 = 0 t = [ 2.71 +/- sqrt ( 7.34-3.69) ]/2 t = [ ...
*September 7, 2015*

**physics**

v = 7.65 - 9.81 t h = 11.1 + Vi t - 4.9 t^2 0 = 11.1 + 7.65 t - 4.9 t^2 solve quadratic for t, time at h = 0, ground, use the positive answer :) then do v = 7.65 - 9.81 t for the speed
*September 7, 2015*

**algebra**

by the way: a pint is a pound the word around. This is an approximation a pint of water is indeed about one pound weight a half kilogram of water also is also about a pound weight and in Europe a half kilo is sometimes called a "pound". That is half a liter.
*September 7, 2015*

**typo**

sorry, a qusrt is 32 oz
*September 7, 2015*

**algebra**

I know a cup is 32 fluid oz but if you do not 8 oz/cup * 2 cup/pt * 2 pt/qt * 4 qt/gal = 128 oz/gal but I did 32 oz/qt * 4 qt/gal = 128 oz/gal 384 ox (1 gal/128 oz) = 3 gal
*September 7, 2015*

**algebra**

3600 s/hr * 24 hr/day = 86,400 s/day 450/86.4 = 5.2 so 5
*September 7, 2015*

**algebra**

suspect you mean x^2 + 2 9+2 = 11
*September 7, 2015*

**math**

total = 9*5 + 15*6 chicken = 9*5 percent = 100 (chicken/total)
*September 7, 2015*

**365.242199**

here you go :)
*September 7, 2015*

**algebra**

but writeteacher, there are 365 plus a fraction days in a year
*September 7, 2015*

**algebra**

That is closer but I suspect Google has it more accurately than 365.25 I bet you want the original answer and not the correct Google answer though
*September 7, 2015*

**algebra**

try using 365.25 days That averages out leap year
*September 7, 2015*

**algebra**

perhaps there are a little more than 365 days in a year ?
*September 7, 2015*

**algebra**

if you asked for seconds it would be 31,536,000
*September 7, 2015*

**algebra**

no idea
*September 7, 2015*

**algebra**

365 d/y * 24 h/d * 60 min/h
*September 7, 2015*

**physics**

t = d/4.09 and t = (20.9 + d)/6.04 so d/4.09 = (20.9 + d)/6.04 d + 20.9 = 1.48 d .48 d = 20.9 d = 20.9/.48 meters
*September 7, 2015*

**Math**

F/M = 13/5 so F = 13 M/5 M + F - 48 = M F = 48 then M = (5/13)F = 18.5 total is 66.5 typo?
*September 7, 2015*

**Precalculus**

1 - i = sqrt 2 [ cos 7pi/4 + i sin 7pi/4) e^it = cos t + i sin t so 1-i = 2^.5 e^(7 pi/4) (1-i)^10 = 2^5 e^(70pi/4) = 32 e^ (70 pi/4) how many 2 pi circles in 70 pi/4 70/8 = 9.75 so 8 full circles and 3/4 of a circle of measure 2 pi so = 32 e^ (3 pi/2 cos 3 pi/2 = 0 sin 3 pi/2...
*September 7, 2015*

**algebra**

T + (T-5) = 12/2 2 T - 5 = 6 2 T = 11 T = 5.5 =============================== check 5.5 + .5 = 6 6 = 12/2
*September 6, 2015*

**physics**

Hi = 46 Vi = 1.2 a = g = -9.81 m/s^2 h = Hi + Vi t - 4.9 t^2 0 = 46 + 1.2 t - 4.9 t^2 t^2 - .245 t - 9.39 = 0 t = [ .245 +/- sqrt ( .06 + 37.6) ]/2 t = [ .245 + 6.13 ] /2 forget negative time t = 3.2 seconds
*September 6, 2015*

**physics**

a = change in velocity / change in time distance = average speed * time average speed = 339/2 = 169.5 m/s so time to stop = .24/169.5 = .0014159 seconds a = -339/.0014159 = -239,419 m/s^2 ouch !
*September 6, 2015*

**notation**

I do not see any exponents exponent sign is ^ 2^3 = 8 for example * symbol means "times"
*September 6, 2015*

**Math**

I bet you have another confusion between multiplication and raising to a power.
*September 6, 2015*

**Physics**

graph a versus t usually it is constant v is area under the a graph if a is constant (horizontal line) then v curve is a straight line with slope a similarly x is area under v curve if a is constant, then v is straight line of slope a and d is a parabola whose slope at any ...
*September 6, 2015*

**Calculus using the first derivative**

y (x+h) = e^(x+h) = e^x e^h y(x+h) - y(x) = e^x e^h - e^x = e^x (e^h - 1) so [y(x+h) - yx) ] / h = e^x [e^h-1]/h as h ----> 0 e^h ----> 1 + h + h^2/2! + h^3/3! .... so as h-->0 e^h -1 -----> h + h^2/2 + h^3/3!... which is h in the limit so we have e^x [ h/h } which...
*September 6, 2015*

**Algebra**

n + d + q = 30 5 n + 10 d + 25 q = 300 n = 2 d so 3 d + q = 30 so q = 30 - 3 d and 20 d + 25 q = 300 20 d + 25(30-3d) = 300 20 d - 75 d + 750 = 300 55 d = 450 d = 8.18 We will have to saw that last dime up
*September 6, 2015*

**Math**

b = 4/a a + 4/a = 5 a^2 - 5 a + 4 = 0 (a-4)(a-1) = 0 a = 1 or a = 4 if a = 1 then b = 4 etc 1 + 16 = 17 1 + 256 = 257
*September 6, 2015*

**Math**

let ab = x let cd = y 2 x + 5 y = 5 x y = 1 so y = 1/x etc in the end you want 4 x^2 and 25 y^2
*September 6, 2015*

**Math**

x^2 + 10 x +(10/2)^2 = x^2 + 10 x + 25 = (x+5)^2 so add 2
*September 6, 2015*

**Math**

a^2-b^2 = (a+b)(a-b)
*September 6, 2015*

**VCU**

100 + .5 m = 60 + .6 m .1 m = 40 m = 400
*September 5, 2015*

**Chemistry**

huh ? 100 (1.93/2.88)
*September 5, 2015*

**Math**

o---------------o 0 ------------- 4 ------------------oo
*September 5, 2015*

**Us. History**

Sure, the few natives who survived reaped the benefits of civilization?
*September 5, 2015*

**physics**

v = a t
*September 5, 2015*

**Physics**

F = rate of change of momentum = m a if the mass is constant so a = F/m
*September 5, 2015*

**Physics**

v = a t
*September 4, 2015*

**mechanics: spring problem**

In total the block fell from 3 to 1 meters off floor so change in gravitational potential m g h = m g (2) there it is stopped so that energy is now stored in the spring which compressed half a meter m g (2) = (1/2) k x^2 = 80 (1/4) = 20 so 20 m = 20 m = 1 kg
*September 3, 2015*

**mechanics: spring problem**

I just did one problem from you, the xo and vo sping
*September 3, 2015*

**Physics**

Initial ke = (1/2)(.05)(400)^2 Final Ke = (1/2)(.05) (50)^2 so work done = (1/2)(.05)( 400^2-50^2) = force * distane = 40,000 T solve for T
*September 3, 2015*

**Pre Calculus**

V = 4.50 (t-5) + Vi where Vi is the initial 2005 value
*September 3, 2015*

**mechanics: simple harmonic oscillation**

x = a sin w t + b cos wt v = a w cos wt - b w sin w t omega = w = sqrt(k/m) at t = 0 x = -xo v = dx/dt = vo - xo = b + vo = a w or a = vo/w so x = (vo/w) sin w t - xo cos wt now I could say magnitude (or amplitude) = sqrt (vo^2/w^2 + xo^2) which is max motion from equilibrium...
*September 3, 2015*

**Algebra**

The y intercept is where the line hits the y axis. That is when x = 0 so y = 0 x + b = b The x intercept is where the line hits the x axis. That is when y = 0 0 = a x + b so x = -b/a (That is why a can not be equal to 0. If it were the x axis intercept would be undefined. This...
*September 3, 2015*

**Elementary Euclidean Geometry(Math)**

Elementary Logic :) hypothesis - if a cow, then a mammal if true then converse - if a mammal then a cow Not sure ( It is the converse we have here :) inverse - if not a cow, then not a mammal Not sure contrapositive - if not a mammal, then not a cow True.
*September 2, 2015*

**ALGEBRA**

7 x^2 + x^2 = 8 x^2
*September 2, 2015*

**Pre-Calc**

Looks good to me. All you really have to do is remember that pi radians = 180 degrees.
*September 2, 2015*

**Pre-Calc**

-780 + 360 = -420 once around -420 + 360 = -60 twice around -60 + 360 = 300 sure enough
*September 2, 2015*

**Math ?**

I have no idea.
*September 2, 2015*

**Math**

If you replace, then the drawings are independent. 16 + 11 + 9 + 15 + 8 + 20 = sum green = 15 so p(green) = 15/sum
*September 2, 2015*

**MATH**

Oh, and remember that sum of angles in parallelogram is 360
*September 2, 2015*

**MATH**

3 x + 2 x + (3/2) x = 180 now try
*September 2, 2015*

**ALGEBRA**

7 x^2 + x^2 = 8 x^2 The first one was correct.
*September 2, 2015*

**ALGEBRA**

8 x^2 - 5 x + 1.5 y
*September 2, 2015*

**Astronomy**

You walk faster than you run, typoo I think 15 min * 60 s/min = = 900 seconds 12 min * 60 s/min = 720 seconds You spent 1620 seconds on this crazy trip You went 900*3.8 = 3420 720*2.5 = 1800 so 5220 meters 5220meters/1620seconds = 3.22 m/s
*September 2, 2015*

**factorisation i need cerious itz too difficult**

sorry (x^2 + y^2)
*September 2, 2015*

**factorisation i need cerious itz too difficult**

Try dividing by (x^2 + 2 y^2)
*September 2, 2015*

**precalc**

3) slope = m = 2 5 = 2*2 + b b = 1 so y = 2 x + 1 4) slope = m = -1/1 = -1 so y = -x + b 4 = 2 + b b = 2 so y = -x + 2
*September 1, 2015*

**math**

1166 2/3 I mean
*September 1, 2015*

**math**

Now you know the math way and the science way :)
*September 1, 2015*

**math**

1 3/4 = 7/4 inch 7/4 inch*(500 miles/.75 inch) = 1167 2/3 miles 14" (500mi/.75") = 9333 1/3 mi etc
*September 1, 2015*

**Math**

12.6666666666..... is greater than 12.63
*September 1, 2015*

**algebra**

well, try 84 (80 + 88 + x)/3 = 84 168/3 + x/3 = 84 168 + x = 252 x = 84 of course since that was original average now 89 80 + 88 + x = 3*89 = 267 168 + x = 267 x = 99 so 84 </= x </= 99
*September 1, 2015*

**simultaneous equation very dificult need help itz urgent**

a - c = b/2 a -c/6 = b -------------- subtract -5c/6 = -b/2 b = 5 c/3 so 5 c/3 + c = 32 8 c/3 = 32 c = 12 your turn
*September 1, 2015*

**alGEBRA 1**

10 days * 24 h/d = 240 h 240 h * 60 min/h = 14,400 min
*September 1, 2015*

**Chem**

mass of acid = 11.299-5.333 grams density = mass/volume = (11.299 - 5.333) g / 5 mL
*September 1, 2015*

**MAT 221**

nah d/6
*September 1, 2015*

**Choctaw Middle School**

3(16) + 4(10) = 48 + 40 = 88
*September 1, 2015*

**Math**

c = m h + b 55 = m (2) + b 65 = m (3) + b ------------------subtract -10 = -m m = 10 c = 10 h + b 55 = 20 + b b = 35 so c = 10 h + 35 if h = 6 c = 60 + 35 = 95
*September 1, 2015*

**Travis elementary school**

123 :)
*September 1, 2015*

**Maths**

5500 = 495 x - 475 x + 4950 550 = 20 x x = 27.5
*September 1, 2015*

**Maths**

x*475 + 10*550 = (x+10)*495
*September 1, 2015*

**math**

a numerical amount.
*September 1, 2015*

**Physic**

That's better R for 2 and 3 in parallel = 2*3/2+3 = 6/5 as we said before If 4 ohm is in series with those then add R total R = 6/5 + 4 = 26/5 current through 4 ohm = all of it = 20/R = 20*5/26 = 100/26 = 3.85 amps voltage across 4 ohm = 3.85*4 =15.38 V voltage across two ...
*September 1, 2015*

**voltage?**

1/2 + 1/3 = 1/R 3/6 + 2/6 = 5/6 so R = 6/5 Ohms now I have no idea what the 4 is. Another R in series? What is the voltage across what ?
*September 1, 2015*

**math**

500/3.3 = 151.5 miles per hour 300/2.5 = 120 miles/hour
*September 1, 2015*

**Math**

slightly different numbers, same problem http://www.jiskha.com/display.cgi?id=1441141046
*September 1, 2015*

**Math**

I just did this :(
*September 1, 2015*

**Algebra**

no x + 2 (2) = 3 x = -1
*September 1, 2015*

**Algebra**

multiply firat equation by 4 4 x + 8 y = 12 4 x + 5 y = 6 ----------------subtract 3 y = 6 y = 2 etc
*September 1, 2015*

**Algebra**

x axis intercept when y = 0 3/4 x = 3 x = 4 y axis intercept when x = 0 y = 3
*September 1, 2015*

**math**

a) 3, 4 , 5 is a common right triangle b) will not quite work 3 is long side 1 + 2 just barely stretches from end to end, just making a thicker three inch line :) c) misses by an inch. 7 + 12 = 19 which will not reach from end to end of 20 d) sure, why not - draw it
*September 1, 2015*

**math**

they have to add up to 8/8
*September 1, 2015*

**Math**

probability of first green = 8/20 probability of second green = 7/19 so (8/20)(7/19)
*September 1, 2015*

**math**

24 + 2 Z = ?
*September 1, 2015*

**Pre-Calculus**

eg https://www.khanacademy.org/math/algebra2/conics_precalc/parabolas_precalc/v/using-the-focus-and-directrix-to-find-the-equation-of-a-parabola
*September 1, 2015*