Friday

February 24, 2017
Total # Posts: 29,391

**math**

maximize .085 x + .068 y x+y <= 50,000 x>=6,000 x<=27,000 y<=34,650 x+y>=1 phony to fill fields I get $3859 at (27000, 23000) ==================== http://www.wolframalpha.com/widget/widgetPopup.jsp?p=v&id=1e692c6f72587b2cbd3e7be018fd8960&title=Linear%...

*November 30, 2016*

**cal**

You are welcome.

*November 30, 2016*

**cal**

3 x^2 dx + 3 y^2 dy = 3 x dy + 3 y dx (y^2 -x)dy = -(x^2-y)dx dy/dx = - (x^2-y)/(y^2-x)

*November 30, 2016*

**Math**

56 = 2 * 28 = 2*2*14 = 2*2*2*7 can not have more than one 2 2*7 = 14

*November 30, 2016*

**math**

2 by 3/2

*November 30, 2016*

**value**

4/5 = .8

*November 30, 2016*

**Math**

+ C :)

*November 30, 2016*

**Math**

x - 6?xdx/( x^2+1) let z = x^2+1 dz = 2 x dx so x dx = (1/2)dz then x - 6?(1/2)dz/z x - 3 ln z x - 3 ln(x^2+1)

*November 30, 2016*

**Math**

?(x^2-6x+1)/(x^2+1) dx =?(x^2+1)dx/( x^2+1)-6?xdx/( x^2+1) = ?dx - 6?xdx/( x^2+1)

*November 30, 2016*

**Portions and integers**

Zero just gives you an arbitrary point on the number line to measure the other two points from. The fact that it happens to be the melting point of ice is irrelevant to this problem. -89 is colder than -39 -89 is LEFT of -39 on our number line -89 < -39 how much colder is ...

*November 30, 2016*

**Not sure**

skin, hair, nails the only thing listed that is related is the hand.

*November 30, 2016*

**physics -- impossible**

if r is the radius above earth center the speed is totally impossible. I suspect a typo

*November 29, 2016*

**Huh initial height?**

If the velocity is only 3 m/s at the bottom, no way it will go up 10 meters. Typo? Did you leave out an initial height?

*November 29, 2016*

**math**

2 x/5 + 35000 = 3 x/4 35000 = 15x/20 - 8x/20 = 7 x/20 5000 = x/20 x = 100,000

*November 29, 2016*

**genetics - no idea**

not my thing - need biology teacher

*November 29, 2016*

**Physics**

LOL valve straight down is stable (pendulum) valve straight up is unstable (balancing pencil on nose) I = mr^2 = 1.005(.36) (about .36) for angle x in radians, restoring moment is about .005*9.81 x r = .003*9.81 x oh well call g = 10 instead of 9.81 = .03 x .03x = -I alpha = -...

*November 29, 2016*

**Algebra 2**

74-m = m/2 + 11 63 = 3 m/2 m = 63*2/3 = 42 74 - 42 = 32

*November 29, 2016*

**maths**

250 - 80 = 170 girls (170/250)100 = ?

*November 29, 2016*

**2**

You can not row cotton profitably everywhere. You need the right soil and water conditions and preferably a large area of flat land. Rice in particular uses very different soil conditions, like wet. Virginia climate was very good for tobacco as was Ky and Tenn.

*November 29, 2016*

**CHECK! LAST TIME MATH!**

100% - 20% = 80% or .8 100% - 10% = 90%

*November 29, 2016*

**CHECK! LAST TIME MATH!**

call it 150 .8 *150 = 120 so yes .9 *120 = 108 so save about 42 total

*November 29, 2016*

**math**

15 is 1/4 of the way around to 60 min 360/4 = 90

*November 29, 2016*

**Check It, Math**

.06*5000 + .08*(10000-5000) = .14*5000 = 700

*November 29, 2016*

**Math**

5(0/10)+ 10/2=5

*November 29, 2016*

**Interest Finite Math**

huh? amount deposited = A Interest earned in 8 years on that is .05 * 8 * A = 1213 A = 1213/0.40

*November 29, 2016*

**Physics**

a 42*9.81 b 42*9.81 cos 34 c force down slope = 42*9.81 * sin 34 so a = 9.81 sin 34 d 3 = .5 (9.81*sin34) * t^2 t is answer to e v = a t = 9.81 sin 34 *t

*November 29, 2016*

**Linear Algebra**

or http://geomalgorithms.com/a02-_lines.html

*November 29, 2016*

**math**

3.25 * 360 = ?

*November 29, 2016*

**Math**

2 n/3 + 8 = 48

*November 29, 2016*

**Social Studies**

I do not see your map. However a major advantage for the North in the Civil War was that the North had a lot more rail transportation, even before Sherman went through.

*November 29, 2016*

**what about it ?**

y = -2 x -16 ???? you do not say what you want done

*November 29, 2016*

**linear programming**

did with linear programming, no need for simplex

*November 29, 2016*

**The Simplex Method**

164 at (8,12) http://www.wolframalpha.com/widget/widgetPopup.jsp?p=v&id=1e692c6f72587b2cbd3e7be018fd8960&title=Linear%20Programming%20Calculator&theme=blue max 10x+7y x+y<=20 x>=3 x<=8 x+y>=1 phony to fill all the blanks

*November 29, 2016*

**Algebra2**

(8^3)^x = 60 ?? 512^x = 60 x = log60/log512

*November 29, 2016*

**algebra**

looks like a letter V with the bottom on the y axis at -2 and slopes of 1 on the right and -1 on the left

*November 29, 2016*

**social studies**

Oh, sorry !

*November 29, 2016*

**social studies**

Van Buren was never president by the way.

*November 29, 2016*

**Social Studies**

I agree with you.

*November 29, 2016*

**Social Studies**

Well, it did not make slavery legal really in Massachusetts for example, but it said the owner could come get him which pretty much amounts to the same thing.

*November 29, 2016*

**Social Studies**

I guess, sort of.

*November 29, 2016*

**Social studies**

Even after they got here it happened google roger williams

*November 29, 2016*

**College Algebra**

2 ln (x-6) well I think x better be greater than 6

*November 29, 2016*

**precalculus**

(2x-1)/(x^2-1) = a/(x+1) + b/(x-1) 2x-1 = ax-a + bx + b 2 = a+b -1 = -a+b -----------add 1 = 2 b b = 1/2 a = 2-b = 3/2 so (3/2) / (x+1) + (1/2)/(x-1)

*November 29, 2016*

**Math**

(3 days/5 gal) * 60 gal = 36 days

*November 29, 2016*

**Math**

s = 5 R = 4 * 5 = 20 (5+x)2 = 20 + x 10 + 2 x = 20 + x x = 10 years from now 20 + 10 = 30

*November 29, 2016*

**Pre-Calculus**

let's put the center of each at 0,0 to make it easy ellipse x^2/a^2 + y^2/b^2 = 1 we could make a and b the same, but that would be a circle and too easy so lets make a = 2 and b = 1 x^2/4+y^2/1 = 1 then major axis along x = 2a = 4 vertex at -2,0 and + 2,0 (also at 0,1 and...

*November 29, 2016*

**Math**

equality wold be x = 5 inequality would be x < or = 5 which we write x </= 5 <5 means less than

*November 29, 2016*

**Math**

I told you above you can buy 1,2,3,4 or 5 but not 6 any positive whole number less than or equal to 5

*November 29, 2016*

**Math**

yes, but what are you going to use 0.454545.... of a CD for?

*November 29, 2016*

**Math**

11x <= 60 x<=60/11 since fractional CDs are not very useful x <= 5 I can buy 1,2,3,4 or 5 but not 6

*November 29, 2016*

**math volume**

I can not see your pictures but Base area = pi d^2 / 4 = pi in^2 base height = 3 pi in^3 = 9.42 in^3

*November 29, 2016*

**social studies**

The western hemisphere, from Brazil to the USA, experienced a huge INVOLUNTARY TRANSATLANTIC migration from Africa.

*November 29, 2016*

**math**

m minibuses m x number in minis n cars n y = number in cars 10 minibuses means m = 10 10 x in buses 6 cars means n = 6 6 y in cars so 10 x + 6 y = 150 but also 5x + 18 y = 150 now we have a plain old 2 eqn, 2 unknown problem multiply the second equation by 2 and we have: 10 x...

*November 29, 2016*

**Physics**

total mass = 2.5+1.2 = 3.7 kg omega = 2 pi f = 2pi/T = sqrt(2300/3.7) = 24.93 so T = .252 second normal force = m g = 1.2 * 9.81 = 11.77 Newtons max friction force = .56*11.77 = 6.59 when does m a = 6.59 N? 6.59 = 1.2 a a = 5.49 meters/s^2 magnitude of a = A omega^2 = A(24.93...

*November 29, 2016*

**Physics**

inward Ac = v^2/r tangential a = dv/dt 7.04 =sqrt[a^2 + (v^2/r)^2 ] 49.56 = 3.03 + v^4/289 v = a t = 1.74 t v^4 = 9.17 t^4 so 46.53 = 9.17 t^4/289 t^4 = 1466 t = 38.3 seconds Check my arithmetic!!!

*November 29, 2016*

**PHYSICS**

omega^2 R double omega, same R, four times 21.3 4*21.3 =

*November 29, 2016*

**Physics**

see http://www.jiskha.com/display.cgi?id=1480442177

*November 29, 2016*

**Algebra 2**

You are welcome.

*November 29, 2016*

**Algebra 2**

Now to check that with physics g is about 32 ft/s^2 T = 2 pi sqrt (80/32) T = 9.9346 seconds, close enough

*November 29, 2016*

**Algebra 2**

80 = .81 T^2 T^2 = 98.76 T = 9.94 seconds

*November 29, 2016*

**Algebra 2**

T = 2 pi sqrt (L/g) if you do physics I will look at your problem in a second

*November 29, 2016*

**Calculus - do not know a**

if t = 0 now y(0) = A 3^0 = A so A = 1000 and y(t) = 1000 3^(t/a) y(5) = 1000 3^(5/a) 100 = 3^t/a log 100 = (t/a) log 3 2 = (t/a).477 t/a = 4.19 y(t) = 1000 3^(t/a) let x = (t/a) y = 1000 3^x then dy/dx = ln 3 * 3^x dy/dt =dy/dx dx/dt dy/dt = ln 3 * 3^(t/a) *(1/a) dy/dt =(1/a)...

*November 29, 2016*

**I can not help**

Sorry, from Massachusetts.

*November 29, 2016*

**SALERY MONEY MATH HELP!**

well, start by thinking what is a 50% raise in all cases, original = 100 now 50% = 50 so now 150 instead of 100 now 100% = 100 so now 200 instead of 100 now 150% so now 250 instead of 100 In other words 150% raise is 150% more than original or 250% OF original. Two and a half ...

*November 29, 2016*

**Calculus**

Your turn

*November 29, 2016*

**Calculus**

s(1) = 0 s(e) = 1 so distance traveled in (e - 1) seconds is one foot v = 1/(e-1) = .582 ft/s d)

*November 29, 2016*

**Calculus**

trivial if constant acceleration a = 2(-1.5) = -3 ft/s^2 v = 60 - 3 t 0 = 60 -3t t = 20 sec average speed during stop = 30 ft/s so by the way distance =- 30*20=600ft

*November 29, 2016*

**Calculus**

a = 4 t -3 s(2) = 8-3 = 5

*November 29, 2016*

**Calculus**

v =ds/dt =d/dt [t ln 2t ] = t(2/2t) + ln 2t = ln 2t This is undefined at t = 0 a = dv/dt = 1/t I would pick none of above

*November 29, 2016*

**History**

No Person except a natural born Citizen, or a Citizen of the United States, at the time of the Adoption of this Constitution, shall be eligible to the Office of President; neither shall any Person be eligible to that Office who shall not have attained to the Age of THIRTY-FIVE...

*November 29, 2016*

**SELLING MATH!**

100 - 16 = 84 .84*573 = 481.32 which is more than 458.40

*November 29, 2016*

**maths**

6 w (w) = 5500 w^2 = 5500/6 get w then L = 6 w

*November 29, 2016*

**You want me to write a book?**

google causes of secession of south in 1861 for example: http://www.civilwar.org/education/history/secession/

*November 29, 2016*

**algebra**

Which ordered pair is a solution of y = x – 4? a. (?1, ?5) -5 = -1 - 4 yes

*November 28, 2016*

**Physics**

omega top = 5 * 2 pi radians/2.78 s = 11.3 radians/s omega = alpha t 11.3 = alpha (17.9) alpha = .631 radians/s^2 but is you want linear radial acceleration only that is Ac = v^2/r =omega^2 r = 11.3^2 * .0713 = 9.10 m/s^2 (close to 1 g :)

*November 28, 2016*

**Math**

or (10+5) (3 + .4) = 10(3+.4) + 5(3+.4) = 30 + 4 + 15 + 2 = 51 again, boring !

*November 28, 2016*

**Math**

or (10 + 5)(3.4) = 34 + 17 = 51 lo and behold !

*November 28, 2016*

**Math**

15 ( 3 + .4) = 45 + 6 = 51

*November 28, 2016*

**precalculus**

If you insist on using substitution the logical first step is x = -4 + y then -4 + y + 2 y = 5 3 y = 9 y = 3

*November 28, 2016*

**calculus need help studying now**

dy/dx = (x-2)^2+(x-7)2(x-2) d^2y/dx^2 = 2(x-2) +2(x-7)+2(x-2) = 2x - 4 + 2x - 14 + 2x - 4 = 6 x -22 zero at x = 11/3

*November 28, 2016*

**Math Question**

x^2 - 7 x = 12 - 4 y -y^2 x^2 -7x + 49/4 = 97/4 -4y -y^2 (x-7/2)^2 + y^2 + 4y =97/4 (x-7/2)^2 + y^2 + 4y + 4 =97/4+16/4 (x-7/2)^2 + (y+2)^2 = 113/4 sure enough center at x=3.5 , y = -2 r = (1/2)sqrt(113) = 5.32

*November 28, 2016*

**precalculus**

I would multiply the top eqn by 5.6 and the bottom one by 6.3

*November 28, 2016*

**Math**

tan 37 = htop/21 tan 28 = hlow /21 so htop + hlow = 21(tan37+tan28)

*November 28, 2016*

**precalculus**

cost = 4000 + 2.15 x rev = 3.50 x

*November 28, 2016*

**Math**

27/sqrt2 = 19.1 from home to mound tan a = 15/19.1

*November 28, 2016*

**no equal sign given**

Do not know what answer you want

*November 28, 2016*

**Maths**

e^0 = 1 so what happens when x = 0 ?

*November 28, 2016*

**Math**

5(0/10)+10/2=5 works:)

*November 28, 2016*

**SOCIAL STUDIES 7 GRADE**

1 d agree 2 c yes That Whitney guy 3 a yes 4 a yes I suspect but do not see chart(Ky,Md,Tenn?)

*November 28, 2016*

**Social Studies**

I tend to agree with you. He was no fan of slavery but wanted to stick within the law which defined the slaves as property at the time.

*November 28, 2016*

**ah, Betta :)**

2.5*4 = 8+2 = 10

*November 28, 2016*

**math**

rate is 40 person hours/ room (40 p hr/ r)/(4p) = 10 hr/room

*November 28, 2016*

**trig**

whew, good !

*November 28, 2016*

**trig**

you could say that r = -6 and theta = pi/2 but that is no good, r must be +

*November 28, 2016*

**trig**

x = 0 y = -6 that is 6 units directly below the origin so r = 6 = sqrt(0^2+6^2) you are three quarters of the way around to two pi

*November 28, 2016*

**trig**

Hey, sketch this stuff on a rough graph.

*November 28, 2016*

**trig**

r = 6 straight down = (3/4)(2 pi) = 3 pi/2 = 1.5 pi

*November 28, 2016*

**science**

No, I am not going to Google Young's modulus of steel for you, E L = 0.6 m r = 0.0025 m A = pi (.0025)^2 delta L/L = 2.5(9.81)/(E A) delta L = 0.6*2.5*9.81/(E*pi*.0025^2)

*November 28, 2016*

**maths**

(48 p/200g)500g = (5/2)*48 = 5*24 = 120p

*November 28, 2016*