Friday

January 30, 2015

January 30, 2015

Total # Posts: 1,800

**math**

(2x-3)*(2x+3)=2x*(2x-3)+3*(2x-3) =4x^2-6x+6x+9 =4x^2+9
*February 24, 2011*

**math**

Final answer is: -3x^3+4x^2-8x+5
*February 24, 2011*

**math**

In google type: polynomials divided solver When you see list of results click on: calc101com/webMathematica/longdivide.jsp When page be open in rectacangle Divide type: 9x^4+0x^3+8x^2+17x-20 In rectacangle by type: -3x-4 Then click option DO IT You will see solution.
*February 24, 2011*

**math**

3/4=(3*5)/(4*5)=15/20 1/10=(1*2)/(10*2)=2/20 (3/4)+(1/10)=(15/20)+(2/20)=17/20= 0.85$
*February 23, 2011*

**math**

sqroot(40)=sqroot(4*10)=2*sqroot(10)
*February 23, 2011*

**math**

d=sqroot[(x2-x1)^2+(y2-y1)^2] Distance between points(7,3)(1,5) x1=7 x2=1 y1=3 y2=5 d=sqroot[(1-7)^2+(5-3)^2] d=sqroot[(-6)^2+2^2] d=sqroot(36+4) d=sqroot(40) Distance between points(8,2)(4,1) x1=8 x2=4 y1=2 y2=1 d=sqroot[(8-4)^2+(1-2)^2] d=sqroot[(4)^2+(-1)^2] d=sqroot(16+1) ...
*February 23, 2011*

**Math (Help This Will Be on My Test Tomorrow!)**

2x(-4x+200/3)=2x*(-4x)+2x*200/3 = -8x^2+400x/3
*February 23, 2011*

**math**

10^8=10*10*10*10*10*10*10*10=100 milions
*February 23, 2011*

**College Math ll**

area= length*width x^2+50x=l*x Divide with x (x^2/x)+50x/x=l*x/x x+50=l l=x+50
*February 23, 2011*

**Math**

420/(5/8)=(420/1)/(5/8)=(420*8)/(5*1) =3360/5=672
*February 23, 2011*

**math**

1+36/99=1+(9*4)/(9*11)=1+4/11
*February 23, 2011*

**math 117 for bobpursley**

sqroot(4)=2 5*sqroot(4)+10*sqroot(4)=5*2+10*2 =10+20=30
*February 23, 2011*

**math**

1.5=(3/y ) Multiply with y 1.5y=3 Divide with 1.5 y=3/1.5 y=2
*February 23, 2011*

**math**

In google type: functions graphs online When you see list of results click on: rechneronline.de/function-graphs/ When page be open in blue recatacangle type: -x Then click option Draw
*February 22, 2011*

**Math**

60%=60/100=(2*3*10)(2*5*10)=3/5 1-(3/5)=(5/5)-(3/5)=2/5 40%= 2/5 NOT completed
*February 22, 2011*

**math**

=distance betwen 2 points d=sqroot[(x2-x1)^2+(y2-y1)^2] In this case x1=0 y1=0 x2=1 y2=1 d=sqroot[(1-0)^2+(1-0)^2] d=sqroot(1^2+1^2) d=sqroot(1+1) d=sqroot(2) d=1.41421 cm
*February 22, 2011*

**Math**

In google type: Gaussian elimination online When you see list of results click on: karlscalculusorg/cgi-bin/linear.pl When page be open in rectacangle: How many equations? (2 to 7) type 3 and click Go then type your coefficients and click GO After each step click Go You will ...
*February 21, 2011*

**Math SOmeone please please help**

Go to : calc101 com Click option derivatives In rectacangle:Take the derivative of type: ((5+u^2)^5)((3-9u^2)^8) In rectacangle:with respect to: type u In rectacangle:and again with respect to type u Then click option: DO IT You will see solution step-by-step By the way on ...
*February 21, 2011*

**math**

V=([d^2*pi)/4] *L [(80^2*pi)/4]*45=[(d^2*pi)/4]*(45+80) Multipy both sides of this equation with(4/pi) (80^2)*45=d^2*(45+80) 6400*45=d^2*125 288000=d^2*125 Divide both sides with 125 288000/125=d^2 2304=d^2 d=sqroot(2304) d=48 cm
*February 21, 2011*

**math**

In google type: Pythagorean Theorem real situations When you see list of results click on some site.
*February 21, 2011*

**math**

1day=24h 1h=60min 1min=60sec 1hour=60*60=3600sec 1day=24h 1day=24*3600 1day=86400sec 1week=7days 1week=7*86400sec (7sec/1week)=7/(7*86400) (7sec/1week)=1/86400 D is correct answer
*February 21, 2011*

**math**

x-2y= -5 x= -5+2y 2x+y= -5 2*(-5+2y)+y= -5 -10+4y+y= -5 -10+5y= -5 5y= -5+10 5y= 5 Diwide both sides with 5 y=1 x= -5+2y x= -5+2*1 x= -5+2 x= -3 Solution: x= -3 y= 1 Checking of result: x-2y= -5 -3-2*1= -5 -3-2= -5 -5= -5 OR 2x+y= -5 2*(-3)+1= -5 -6+1= -5 -5= -5
*February 20, 2011*

**math please help**

3-8x=141 -8x=141-3 -8x=138 Divide both sides with -8 x=138/(-8) x= -17.25
*February 20, 2011*

**GED MATH**

In: rechneronline.de/function-graphs if you wat to see zoom of graph in Display properties set: Range x-axis from -1.5 to 1.5 Range y-axis from -4 to 1
*February 18, 2011*

**GED MATH**

If you wat to see graph of your function in google type: function graphs online When you see list of results click on: rechneronline.de/function-graphs When page be open in blue rectacangle type: 4x^2+2x-3 Then click option Draw You will see graph of your function Then in ...
*February 18, 2011*

**math**

y=4x-5 x=3 y=4*3-5=12-5=7 x=5 y=4*5-5=20-5=15 x=7 y=4*7-5=28-5=23 Input values 3,5,7 Output values 7,15,23
*February 18, 2011*

**8th grade math **

2x-2= -18 2x= -18+2= -16 Divide with 2 x=-8 -7x+7y=7 -7*(-8)+7y=7 56+7y=7 7y=7-56 7y= -49 Divide with 7 y= -7 One solution x= -8 y= -7
*February 17, 2011*

**math**

d=distance betwen 2 points d=sqroot[(x2-x1)^2+(y2-y1)^2] In this case x1=0 y1=0 x2=1 y2=1 d=sqroot[(1-0)^2+(1-0)^2] d=sqroot(1^2+1^2) d=sqroot(1+1) d=sqroot(2) d=1.41421 cm In google type:distance formula and you will find more sites about that
*February 17, 2011*

**math**

In google type: angle of depression angle of elevation You will find many sites about that. Sometime find informations about your homeworks on Internet.
*February 17, 2011*

**math**

1g=1000mg 0.925*1000=925 mg/l 1l=1000ml 100ml=1000/100=0.1l 0.1*925=92.5 0.925g/l=92.5mg/100ml
*February 17, 2011*

**math**

x^2=3x-6 x^2-3x+6=0 In quadratic equation y=ax^2+bx+c discriminate is D=b^2-4ac In your case a=1 b= -3 c=6 D=b^2-4ac=(-3)^2-4*1*6=9-24= -15 When discriminante is negative quadratic have two imaginare solutions. If you want to know that solutions in google type: quadratic ...
*February 17, 2011*

**math**

You must find where is : -0.8t^2-10t+330=0
*February 17, 2011*

**math**

You must find where is : -0.8t^2-10t+330= In google type: "quadratic equation online" When you see list of results click on: webgraphingcom/quadraticequation_quadraticformula.jsp When page be open in rectacangle type: -0.8t^2-10t+330=0 and click option solve it. ...
*February 17, 2011*

**math**

4x-6y=30 3x-5y=24 (4x-6y=30) Multiply with 3 12x-18y=90 (3x-5y=24) Multiply with 4 12x-20y=96 Now you have System: 12x-18y=90 12x-20y=96 Subtracting 12x-18y=90 from 12x-20y=96 gives: 12x-12x-18y-(-20y)=90-96 0-18y+20y= -6 2y= -6 Divide with 2 y= -3 4x-6y=30 4x-6*(-3)=30 4x+18=...
*February 16, 2011*

**math**

If you wat to see graph of your function in google type: "function graphs online" When you see list of results click on: rechneronline.de/function-graphs When page be open in blue rectacangle type: x^3-1.5x^2 Then click option Draw You will see graph of your function
*February 16, 2011*

**math**

Local minimum or maximum is points where first derivation=0 Derivation of x^3-(3/2)x^2 is 3x^2-(3/2)*2x=3x^2-3x =3*(x^2-x) =3*x*(x-1) Zeros of this expresion is x=0 and x=1 Second derivate of this x^3-(3/2)x^2 is 6x-3 Function have local minimum where is second derivation is ...
*February 16, 2011*

**math**

You also can in google type: derivatives online When you see listo of results click on: numberempirecom/derivatives.php and solvemymathcom/online_math_calculator/calculus/derivative_calculator/index.php On this sites you will see your derivation in two different simplify forms
*February 16, 2011*

**math**

In google type calc101 When you see list of results click on: calc101com When page be open click option: derivatives When page be open in rectacangle type: 5/(t)^(1/4)-6/(t)^(2/3) In rectacangle: with respect to type t In rectacangle: and again with respect to type t Then ...
*February 16, 2011*

**math**

Second equation: -x+2=-y Multiply with(-1) x-2=y y=x-2 If y=x-2 then 2y=2*(x-2)=2x-4 In first equation: -4=x-2y -4=x-(2x-4) -4=x-2x+4 -4+(-4)=-x -8=-x -x=-8 Multiply with(-1) x=8 In second equation y=x-2 y=8-2 y=6 x=8 y=6 Proof: First equation: -4=x-2y -4=8-2*6 -4=8-12 -4=-4 ...
*February 16, 2011*

**math**

A common form of a linear equation in the two variables x and y is: y=mx+b where m and b designate constants. In you case: 9x+3y=15 3y=15-9x Diwide wit 3 y=-3x+5 -6x-4y=-8 -4y=-8+6x Divide with -4 y=-(6/4)x+2 y=-(3/2)x+2 y=-1.5*x+2 In google type: functions graphs online When ...
*February 16, 2011*

**math**

I write: y=x^2-6x+9 but you can write: f(x)=x^2-6x+9
*February 16, 2011*

**math**

You mus find values where is: x^2-6x+9=25 x^2-6x+9-25=0 x^2-6x-16=0 In google type: "quadratic equation online" When you see list of results click on: webgraphingcom/quadraticequation_quadraticformula.jsp In rectacangle type: x^2-6x-16=0 an click option solve it ...
*February 16, 2011*

**math**

-7(11-4w)-15 = -27-(50-13w) -7*11-7*(-4w)-15= -27-50+13w -77+28w-15= -77+13w -92+28w= -77+13w 28w-13w= -77+92 15w=15 Divide with 15 w=1
*February 14, 2011*

**Math**

L=Lenght W=Width A=L*W L=3W 2700=3W*W 2700=3W^2 Diwide with 3 2700/3=W^2 W^2=900 W=sqroot(900)=30ft L=3W=3*30=90ft L=90ft W=30ft A=L*W=90*30=2700ft^2
*February 13, 2011*

**math**

L=Lenght W=Width L=W+3 A=L*W 108=(W+3)*W 108=W^2+3W W^2+3W-108=0 Solutions of this equation is: -12 and 9 Lenght can't be negative,so W=9m L=W+3=9+3=12m L=12m W=9m A=12*9=108m^2
*February 13, 2011*

**math**

go to en.wikipedia and type: Piecewise linear function
*February 13, 2011*

**Math**

Do mathematical operations,then put unknown values on left side of equation,nubers on right side. For example: -(x+40)=10(3x-4) -x-40=30x-40 -x-30x=-40+40 -29x=0 x=0 -11x+13=-42 -11x=-42-13 -11x=55 Divide with -11 x= -5 9x+2=15x-10 9x-15x= -10-2 -6x= -12 Divide with -6 x=(-12...
*February 13, 2011*

**Math**

My mistake : [(5-(-10)]=5+10=15 m=15/(-7)=(-15)/7
*February 13, 2011*

**Math**

This is the formula for finding the slope of a line. m is the variable used for the slope m=(y2-y1)/(x2-x1) m=[(5-(-10)]/(-3-4) m=(-15)/(-7) m=15/7 Becose ratio of two negative nubers is positive number
*February 13, 2011*

**math 5th grade**

R=Regular coffee F=Flavored coffee R=3*F R+F=8/9 3*F+F=8/9 4F=8/9 Divide with 4 F=(8/9)/4=8/(9*4)=8/36=(2*2*2)/(2*2*9)=2/9 F=2/9 R=3*F R=3*(2/9)=3*2/(3*3)=2/3 R=2/3 F=2/9 R+F=(2/3)+(2/9)=[2*3/(3*3)+(2/9)]= (6/9)+(2/9)=8/9
*February 12, 2011*

**math**

75x^4+35x^3-10x^2=(5x^2)*(15x^2+7x-2) Factoring: 15x^2+7x-2 Using the factor pair (-3, 10) whose sum is 7, rewrite your equation replacing the term 7 x with -3 x and 10 x. 15x^2+7x-2=15x^2-3x+10x-2 Now group the first two terms and the last two terms on the left hand side: (...
*February 11, 2011*

**math**

What is your exspresion? 54x^3-30x^2+15x OR 45x^3-30x^2+15x 54x^3-30x^2+15x=3x*(18x^2-10x+5) 45x^3-30x^2+15x=15x*(3x^2-2x+1)
*February 11, 2011*

**math**

A common form of a linear equation in the two variables x and y is: y=mx+b where m and b designate constants. The origin of the name "linear" comes from the fact that the set of solutions of such an equation forms a straight line in the plane. In this particular ...
*February 11, 2011*

**MAth(Someone please help)**

In google type: "function graphs online" When you see list buf results click on: rechneronline.de/function-graphs/ When page be open in blue rectacangle type: 0.002x^2+0.005x-0.029 In Display properties set: Range x-axis -50 to 50 and Range y-axis -1 to 5 Then click ...
*February 10, 2011*

**math**

7.8*10^7=7.8*10000000=78000000 78 milions
*February 9, 2011*

**math**

x1= -2 x2=x1+3= -2+3=1 x3=x2+3=1+3=4 output1=12 output2=output1-3=12-3=9 output3=output2-3=9-3=6 x(n+1)=x(n)+3 output(n+1)=output(n)-3
*February 9, 2011*

**math**

y=2x-2 y=x+2 y=y 2x-2=x+2 2x-x=2+2 x=4 y=2x-2 y=2*4-2=8-2=6 y=x+2 y=4+2=6 x=4 y=6
*February 9, 2011*

**Math**

(3/5)*x-6*x=4 (3/5)*x-6*x=4 3/5=0.6 0.6*x-6*x=4 0.6*x-6*x=4 -5.4*x=4 Divide with -5.4 x=4/(-5.4) 4/(-5.4)=40(-54) x=40/(-54) Factorization of numbers 40 and 54 40=2*2*2*5 54=2*3*3*3 x=40/(-54) x=(2*2*2*5)/(-2*3*3*3) x=(2*2*5)/(-3*3*3) x=20/(-27) x= -0,...
*February 7, 2011*

**math**

6*10^9=6*10*10*10*10*10*10*10*10*10
*February 7, 2011*

**math**

3*10^6=3*10*10*10*10*10*10=3000000= 3 milions
*February 7, 2011*

**math**

2cm of scale=25km Divide wit25 1km=2/25=0,08cm of scale 145*0,08=11.6cm 80*0,08=6.4 cm
*February 7, 2011*

**math**

3(x-2)+12(x+8)= 3*x-3*2+12*x+12*8= 3x-6+12x+96= 15x+90 3(x-2)+12(x+8)=15x+90
*February 7, 2011*

**math**

1/6=2/12 (9/12)+(1/6)=(9/12)+(2/12)= 11/12 less then 1
*February 7, 2011*

**math**

30>-6(5-x) 30> -30+6x 30+30>6x 60>6x Divide with 6 10>x x<10
*February 5, 2011*

**math**

In google type: "function graphs online" When you see list buf results click on: rechneronline.de/function-graphs/ When page be open in blue rectacangle type your function and click otion Draw
*February 4, 2011*

**math**

In google type: "function graphs online" When you see list buf results click on: rechneronline.de/function-graphs/ When page be open in blue rectacangle type: x+7 in grey rectacangle click: 2*x-5 In Display properties set: Range x-axis -20 to 20 and Range y-axis -20 ...
*February 4, 2011*

**math**

In en.wikipedia type: "Half-life" and read text, and retype formulas. So: N(t)=N0*e^(-lambda*t) N(t)=N(17)=3 N0=10 t=17 3=10*e^(-lambda*17) Divide with 10 3/10=e^(-lambda*17) e^(-lambda*17)=3/10 -lambda*17=ln(3/10)Divide with 17 -lamba=ln(0.3)/17 lamda=-ln(0.3)/17 ...
*February 3, 2011*

**math**

22-2*[5+3(6-1)]= 22-2*[5+3*5]= 22-2*(5+15)= 22-2*20= 22-40= -18
*February 2, 2011*

**math**

100 m = (1/4)*400 m 1 min=60 sec 60*1/4= 15 sec
*January 30, 2011*

**Math(Please check)**

f'(x)=7 for all values of x
*January 30, 2011*

**Applied Business Math/Colleg student**

(2/3)=(2*4)(3*4)=(8/12) (1/6)=(2*1)/(2*6)=(2/12) 2/3+1/6+11/12= =(8/12)+(2/12)+(11/12) =(21/12) =(12+9)/12 =(12/12)+(9/12) =1+(3*3)/(3*4) = 1 3/4 =(4/4)+(3/4) =7/4
*January 29, 2011*

**Math**

The most useful form of straight-line equations is the "slope-intercept" form: y = mx + b m is the slope and "b" gives the y-intercept. 3x-5y=8 -5y=8-3x Divide with -5 y=(-8/5)+(3x/5) y=(3/5)x-8/5 The other format for straight-line equations is called the &...
*January 27, 2011*

**math**

In google type: "quadratic equation online" When you see list of result click on: webgraphingcom/quadraticequation_quadraticformula.jsp When this page be open in rectacangle type: x^2-x-2=0 and click option solve it! You will see solutions of this equation Step-by-...
*January 27, 2011*

**Math**

5=20/4 (2/3)q+(20/4)=(3/4) (2/3)q=(3/4)-(20/4) (2/3)q= -17/*4 Multiply with 4 (8/3)q= -17 Multiply with 3 8q= -17*3 8q= -51 Divide with 8 q= -51/8
*January 27, 2011*

**math/science**

48km=48000m 3/48000=1/16000 h 1h=3600 sec (1/16000)*3600=3600/16000= 0.225 sec
*January 27, 2011*

**math**

The common distance of the points of a circle from its centre is called its radius. Diametar=2*Radius go to en.wikipedia and type circle in search field.
*January 25, 2011*

**math**

1 hour=60 min=4*15 min half hour=30min=2*15 min 4+2=6 6*1=6 miles
*January 25, 2011*

**math**

1 foot=12 in (1 foot)^2 =(12 in)^2 1square foot = 144square inchs
*January 25, 2011*

**math**

(3/2 )/(4/5)=(3*5)/(2*4)=15/8 (1/2)*(1/2)=1/4=2/8 (15/8)+(2/8)=17/8=(16+1)/8=(16/8)+(1/8)= 2 1/8
*January 25, 2011*

**Math**

Subtract 8 of each numbers 64-8=56 56-8=48 48-8=40 40-8=32 Pattern: 64,56,48,40,32
*January 25, 2011*

**math**

2*10+2*100+0.4=20+200+0.4=220.4
*January 25, 2011*

**Math Algebra**

2m+3n=4 2m+3*2=4 2m+6=4 2m=4-6 2m= -2 Divide with 2 m= -1 n=2 m= -1 2m +3n=4 Check of results: 2m+3n=4 2*( -1)+3*2=-2+6=4 -m+2n=5 -( -1)+2*2=1+4=5
*January 25, 2011*

**Math**

The most useful form of straight-line equations is the "slope-intercept" form: y = mx + b m is the slope and "b" gives the y-intercept. The other format for straight-line equations is called the "point-slope" form. For this one, they give you a ...
*January 24, 2011*

**Math (Calculus AB)**

The slope of tangent line is first derivation of function. slope=dy/dx If you don't know how to find Derivation in Google type: "calc101" When you see list of results click on: calc101com When page be open click option: derivatives In rectacangle type: x*cos[x] (...
*January 24, 2011*

**math**

5/7=(8*5)/(8*7)=40/56 6/8=(7*6)/(7*8)=42/56 30/56 < 40/56 30/56 < 42/56
*January 22, 2011*

**Math**

On: rechneronline.de/function-graphs/ In Dispay properties type follow values: Range x-axis from -6.28 to 6.28 Range y-axis from -5.5 to 1.5
*January 22, 2011*

**Math**

I suppose that 90 in your first equation is 90° 90°=(pi/2) radians y+3= 2sin(3x +90°) y=2sin(3x +90°)-3 y=2sin(3x +90°)-3 Angle in degres y= 2sin(3x +pi/2)-3 Angle in radians In google type: "function graphs on line" When you see list of results ...
*January 22, 2011*

**Math**

3/6=1/2 7sqrt(3/6)=7sqrt(1/2)=7/sqrt(2)
*January 22, 2011*

**Math**

8/9=20/x 8x=20*9 8x=180 Divide with 8 x=180/8 x=(2*2*45)/(2*2*2)=45/2=22.5
*January 22, 2011*

**math**

sin(A)=cos(90°-A) cos(33°)=sin(90°-33°)=sin(57°)
*January 21, 2011*

**math**

In google type: "quadratic equation online" When you see list of result click on: webgraphingcom/quadraticequation_quadraticformula.jsp When this page be open in rectacangle type equation: 3a^2+6a-189=0 and click option solve it! You will see solutions of this ...
*January 20, 2011*

**math**

Fist number= a Second number= a+1 Third number= a+2 a^2+(a+1)^2+(a+2)^2=194 (a+1)^2=a^2+2*a*1+1^2=a^2+2a+1 (a+2)^2=a^2*2a*2+2^2=a^2+4a+4 a^2+a^2+2a+1+a^2+4a+4=194 3a^2+6a+1+4=194 3a^2+6a+5-194=0 3a^2+6a-189=0 The exactsolutions of this equation are: a=7 and a=-9 Solution: ...
*January 20, 2011*

**math**

0<x<15cm x= larger of 0 and lesser of 15cm
*January 20, 2011*

**Math/Trig**

L=r*aplha alpha in radians L=7.7 alpha=pi/7 7.7=r*(pi/7) divide with (pi/7) r=7.7/(pi/7) r=(7.7*7)/pi r=53.9/3.1415926535 r=17,1569cm r=17.2cm
*January 20, 2011*

**math**

7/7=1
*January 20, 2011*

**math help please!!**

log(x-2)= 1-log(x+1) log(x-2)+log(x+1)=1 log(a)+log(b)=log(a*b) log(x-2)+log(x+1)=log((x-2)*(x-1)) 1=log(10) log((x-2)*(x-1))=log(10) So: (x-2)*(x+1)=10 x^2-2x+x-2=10 x^2-x-2=10 x^2-x-2-10=0 x^2-x-12=0 Exact solutions of this equation is: -3 and 4 Negative numbers have not ...
*January 20, 2011*

**math log**

Third row have typefeler Correct formula is: log(a+b)=log(a)+log(b)
*January 20, 2011*

**math log**

7.2=36/5 36=6*6 log(a+b=log(a)+log(b) log(36)=log(6)+log(6)=2*log(6) log(a/b)=log(a)-log(b) log(36/5)=2*log(6)-log(5) log(6)=m log(5)=n log(36/5)=log(7.2)=2m-n
*January 20, 2011*

**college math 209**

In google type "quadratic equation online" when you see list of results click on: webgraphingcom/quadraticequation_quadraticformula.jsp Whenn this page be open in rectacangle type your equation,and click option solve it and you will see solution Step-by-step
*January 16, 2011*

**college math 209**

In google type "quadratic equation online" when you see list of results click on: webgraphingcom/quadraticequation_quadraticformula.jsp When this page be open in rectacangle type your equation,and click option solve it You will see solution Step-by-step
*January 16, 2011*

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