Monday

August 31, 2015
Total # Posts: 1,911

**algebra**

( 55 + 80 + 70 + x ) / 4 <= 65 Multiply both sides with 4 55 + 80 + 70 + x <= 65 * 4 55 + 80 + 70 + x <= 260 x <= 260 - 55 - 80 - 70 x <= 55
*September 18, 2011*

**algebra**

4 x + y = 5 y = 5 - 4 x 3 x – 7 y = 27 - 7 y = 27 - 3 x Divide both sides with -7 y = - 27 /7 + 3 x / 7 In google type: functions graphs online When you see list of results click on: rechneronline.de/function-graphs When page be open in blue rectangle type: 5 - 4 x In ...
*September 18, 2011*

**Algebra**

First in google type: Cramer's rule 2 equations When you see list of results click on: occc dot edu/maustin/cramers_rule/cramer's%rule.html and read text Then in google type: Cramer's rule 2x2 solver When you see results click on: Solver Using Cramer's Rule to ...
*September 16, 2011*

**Calculus**

Go on: wolframalpha dot com When page be open in rectangle type: limit x^4 as 2 After few seconds when you see result click option: Show steps
*September 16, 2011*

**math**

Correction: ( -9h + 12h ) + ( - 6 + 40 ) = 22
*September 15, 2011*

**math**

-9h - 6 + 12h + 40 = 22 ( -9h + 12h ) - ( 6 + 40 ) = 22 3h + 34 = 22 3h = 22 -34 3h = - 12 Divide both sides with 3 h = -4
*September 15, 2011*

**Maths**

In google type: monthly payment definition You will find many sites with definition
*September 14, 2011*

**geometry**

The "point-slope" form of the equation of a straight line is: y - y1 = m ( x - x1 ) (x1, y1) is a known point m is the slope of the line (x, y) is any other point on the line In this case: m = 5 / 3 , x1 = 57 , y1 = 12 y - 12 = ( 5 / 3 ) (x - 57 ) y = (5 x / 3 ) - ( ...
*September 13, 2011*

**algebra**

Go on wolframalpha dot com When page be open in rectangle type: solve 5/(2x+1)^2 - 3/(2x+1)=2 After few seconds when you see results click option: Show steps
*September 12, 2011*

**math 116**

Go on wolframalpha dot com When page be open in rectangle type: solve (Correct expression of your function) After few seconds when you see results click option: Show steps
*September 11, 2011*

**math 116**

8x 4=4x 7 What this mean? 8 x + 4 = 4x + 7 8 x + 4 = 4x - 7 8 x ^ 4 = 4x ^ 7 Or what?
*September 11, 2011*

**math 116**

8 x + 4 = 4x 7
*September 11, 2011*

**calculus**

Go on wolframalpha dot com When page be open in rectangle type: limit 3x/(sin2x) as x->0 and click option: = After few seconds when you see result click option: Show steps
*September 11, 2011*

**Math(Please check! Thank you!!)**

568 cm = 568 / 100 = 568 * 0.01 = 5.68 m
*September 11, 2011*

**Math(Please check! Thank you!!)**

1) 1 kg = 1000 g 3.68 kg = 3.68 * 1000 = 3680 g 2) 1 m = 100 cm 1 cm = 1 / 100 = 0.01 m 568 cm = 568 / 100 = 5.68 * 0.01 = 5.68 m You can check this. In google type: unit converter You will find many sites for units convertion.
*September 11, 2011*

**algebra**

babygirl Can you solve any mathematical question,or you think that somebody on this site will working all your homeworks?
*September 9, 2011*

**math**

This is the square numbers. 1 ^ 2 = 1 2 ^ 2 = 4 3 ^ 2 = 9 4 ^ 2 = 16 5 ^ 2 = 25 6 ^ 2 = 36 7 ^ 2 = 49 8 ^ 2 = 64 Now put hyphens between EVERY digit: 1-4-9-1-6-2-5-3-6-4-9-6-4
*September 7, 2011*

**math**

C = 2 r pi 6 pi = 2 r pi Diwide both sides with 2 pi 3 = r r = 3 yd A = r ^ 2 pi A = 3 ^2 pi A = 9 pi yd ^ 2 For more information in google type: wikipeda circle
*September 7, 2011*

**Pre-Calc-Please check my answer-I think I have it**

In google type: quadratic equation online When you see list of results click on: Free Online Quadratic Equation Solver:Solve by Quadratic Formula When page be open in rectangle type: 2x^2 + 5x = 10 and click option: solve it! You wil see solution step-by-step.
*September 7, 2011*

**Algebra**

3x + y = -8 y = -8 -3x 2x - y = 11 y= 2x - 11
*September 7, 2011*

**Pre-Calc-Please check my answer-I think its correc**

In google type: quadratic equation online When you see list of results click on: Free Online Quadratic Equation Solver:Solve by Quadratic Formula When page be open in rectangle type: 2x^2 + 5x = 10 and click option: solve it! You wil see solution step-by-step.
*September 7, 2011*

**Calculus :)**

Go on site: wolframalpha dot com When page be open in rectangle type: integrate 53dx/(x^2sqrt(x^2+4)) and click option = After few seconds when you see results click option: Show steps
*September 7, 2011*

**Calculus**

Go on: wolframalpha dot com When page be open in rectangle type: limit ((sqrt(x+4))-2)/x as x 0 and click option = After few seconds when you see result click option: Show steps If you dont know find derivative of(-2 +sqrt(x+4)) in wolframalpha type: derivative (-2 +sqrt(x+4...
*September 6, 2011*

**pre calculus**

In google type: functions graphs online When you see results click on: rechneronline.de/function-graphs/ When page be open in blue rectangle type: x^3+3x^2-5x-7 Then set: Range y-axis from -20 to 20 and click option: Draw
*September 6, 2011*

**college algebra**

10 1/2 = ( 20 / 2 ) +( 1 / 2 ) = 21 /2 42 = 84 / 2 42 / ( 10 1/2) = ( 84 / 2 ) / ( 21 / 2 ) = 84 / 21 = 4
*September 4, 2011*

**college algebra**

S = C + RC S = C * ( 1 + R ) Divide both sides with ( 1 + R ) S / ( 1 + R ) = C C = S / ( 1 + R )
*September 4, 2011*

**Calculus**

Go to: wolfram alpha dot com When page be open in rectangle type: integrate x^9*(sin(x^5)) and click option = When you see result click option: Show steps
*September 4, 2011*

**Math**

x^13 = j Divide both sides with x x^13 / x = j / x ( Remark: x^13 / x = x^12 ) x^12 = j / x x^12 = 4 / 9 j / x = 4 / 9 Multiply both sides with 9 9 j / x = 4 Multiply both sides with x 9 j = 4x Divide both sides with 4 9 j / 4 = x x = 9 j / 4 x = ( 9 / 4 ) j
*September 4, 2011*

**math**

In google type: inequalities and negative numbers You will find couple sites. mathforum is good. 1. -2 x - 10 < 2 -2 x < 2 + 10 -2 x < 12 Divide both sides with -2 x > 12 / - 2 x > - 6 2. -2x + 15 < 17 -2 x < 17 - 15 -2 x < 2 Divide both sides with -2 x...
*September 4, 2011*

**Precalculus**

In google type: Write the rectangular equation (x+7)^+y^=49 in polar form When you see list of results click on: winpossible dot com
*September 3, 2011*

**math ap**

( 5 + 7 ) - ( 9 + 2 ) = 12 - 11 = 1 cm Put the 7cm and 5 cm rods together = 12 cm Put the 9cm and 2cm rods together = 11 cm Difference between is 1cm thus, you can use that difference to measure 1 cm.
*September 1, 2011*

**calculus**

cos ( x ) = + OR - 1 /sqrt ( 1 + tan ^2 (x) )
*September 1, 2011*

**calculus**

sin ( x ) = + OR / [ tan (x) /sqrt ( 1 + tan ^2 (x)] sin ( x ) = + OR - [ 4/ sqrt ( 1 + 4 ^2 ) ] sin ( x ) = + OR - m4/ sqrt ( 1 + 16 ) sin ( x ) = + OR - 4/ sqrt ( 17) cos ( x ) = + OR / 1 /sqrt ( 1 + tan ^2 (x) cos( x ) = + OR - 1 / sqrt ( 17) If you want all trigonometric ...
*September 1, 2011*

**math**

For: y=x Technically there is no tangent line to a straight line because the definition of tangent means a line a touching at one point. Answer is: x^2 and x^3
*August 31, 2011*

**Math**

( 5 + 7 ) - ( 9 + 2 ) = 12 - 11 = 1cm
*August 30, 2011*

**algrebra**

3x + 9 - 8x + 6 = 62/3 Multipy both sides with 3 9x + 27 - 24x + 18 = 62 9x - 24x = 62 - 27 - 18 -15x = 17 Divide both sides with -15 x= -17/15
*August 23, 2011*

**math**

y = ( -4 / 3 ) * x + 1 for x = -6 y = ( -4 / 3 ) * (-6) + 1 y = 24 / 3 + 1 y = 8 + 1 y = 9 for x = -3 y = ( -4 / 3 ) * (-3) + 1 y = 12 / 3 + 1 y = 4 + 1 y = 5 for x = 6 y = ( -4 / 3 ) * 6 + 1 y = -24 / 3 + 1 y = -8 + 1 y = -7 Remark: * is symbol for multiply
*August 22, 2011*

**math**

In google type: arithmetic mean geometric mean real life You will find many sites with examples.
*August 22, 2011*

**math**

-2x(3y-2xy) = -2x*3y -2x *( -2xy )= -6xy + 4 x^2*y
*August 21, 2011*

**Maths**

ð = pi
*August 21, 2011*

**Maths**

r1= first radius r2= second radius r1+r2=14 r2=14-r1 The sum of circles areas is: r1^2 * ð + r2^2 * ð = 130ð ð * ( r1^2 + r2^2 ) = 130ð Divide both sides with ð ( r1^2 + r2^2 ) = 130 r1^2 + ( 14 - r1 )^2 = 130 r1^2 + 14^2 - 2 * r1 *14 + r1^2 = 130 r1^2...
*August 21, 2011*

**Math**

In google type: quadratic equation online When you see list of result click on: Free Online Quadratic Equation Solver:Solve by Quadratic Formula When page be open in rectangle type: (x^2)+3x-4=14 and cilck option: solve it! You will see solutions step-by step.
*August 19, 2011*

**trig**

In google type: Graphs of the trigonometric functions You will find many sites with graph of y=sin(x) or y=sin(theta) sin(theta)=0 for: theta=0 theta= pi radians or theta=180° and theta= 2pi radians or theta=360°
*August 18, 2011*

**Calculus :)**

Go on : wolframalpha dot com When page be open in rectangle type: derivative x^y=y^x and click option = When you see result click option: Show steps
*August 17, 2011*

**algebra**

In google type: functions graphs online When you see list of results click on: rechneronline.de/function-graphs/ When page be open in blue rectangle type: x+9 Then in Range x-axis from type -10 to 10 In Range y-axis from also type -10 to 10 and click option Draw
*August 12, 2011*

**math 1012**

239 cm = 2.39 m
*August 4, 2011*

**math 1012**

1 m = 100 cm 2 m = 200 cm 39 cm + 2 m = 39 + 200 = 239 cm
*August 4, 2011*

**math**

7(ac + 2b) + 2ac = 7ac + 2*7b + 2ac= 9ac + 14b
*August 3, 2011*

**Mathematics**

1/3 of 2x = 2x / 3 2x/3 = 5 Multiply both sides with 3 2x = 3 * 5 2x = 15 Divide both sides with 2 x = 15 / 2 4x = 4 * 15 / 2 4x = 60 / 2 4x = 30 2/3 * 30 = 60 / 3 = 20
*August 2, 2011*

**math\**

36 % = 36 /100 36 % of fifty = (36/100)*50 = 36*50 /100 = 1800 /100 = 18
*August 2, 2011*

**Math**

In google type: circumference of a circle When you see list of results go on wikipedia. C = circumference d = diameter C = d*pi C = 21*3.14159 C = 65.97339 in
*July 29, 2011*

**math**

(1/2)*(2/2)= 2/4 2/4 is less of 3/4 1/2 is less of 3/4
*July 25, 2011*

**algebra**

(a-b)^2 = a^2 - 2ab + b^2 (y-8)^2 = y^2 - 2*y*8 + 8^2 (y-8)^2 = y^2 - 16y + 64
*July 19, 2011*

**algebra**

When page be open click: 2a^2-3a=-5 Then option: Solve by Factoring(includes Factoring by Grouping) and cilck option: solve it!
*July 19, 2011*

**algebra**

In google type: quadratic equation online When you see list of result click on: Free Online Quadratic Equation Solver:Solve by Quadratic Formula When page be open in rectangle type: 2a^2-3a=-5 (Exactly in this form) Then click option: 2a^2-3a=-5 and cilck option: solve it! You...
*July 19, 2011*

**math**

For x= -6 y=(7/6)*(-6)+1= -7+1= -6 For x=0 y=(7/6)*0+1= 0+1=1 For x=6 y=(7/6)*(6)+1=7+1=8 For graph go on: rechneronline.de/function-graphs When page be open in blue rectangle type: (7/6)*x+1 Then type: Range x-axis from -10 to 10 Range y-axis from -10 to 10 and click option: ...
*July 19, 2011*

**math**

rechneronline.de/function-graphs/ IN BLUE RECTANGLE TYPE: (x+4)^2+4
*July 14, 2011*

**math**

Some quadratics can be factored into two identical binomials. These quadratics are called perfect square trinomials. Perfect square trinomials can be factored as follows: a^2+2ab+b^2=(a+b)^2 OR a^2-2ab+b^2=(a-b)^2 In this case: a=1 2ab=8 2*1*b=8 2b=8 Diwide both sides with 2 b...
*July 14, 2011*

**math**

L=Lenght W=Width D=Depth V=Volume V=W*L*D W*L=A A=Area of a pool V=A*D Diwide with A V/A=D D=V/A In this case: A=L*W A=22*40 A=880 ft^2 D=V/A=2500/880= 2.8409 ft
*July 10, 2011*

**integration (calculus)**

Go to: wolframalpha dot com When page be open in rectangle type: integrate ((e^-x-1)/(e^-x + x)^2) dx and click option = When you see solution click option: Indefinite integral:Show steps
*July 7, 2011*

**cal**

wolframalpha dot com Type: integrate sqrt(x)lnx dx and click option = then: Indefinite integral: Show steps
*July 6, 2011*

**CALCULUS**

Go on : wolframalpha dot com When page be open in rectangle type your function. After few seconds you will see all about your function. Then click option: Indefinite integral:Show steps If you click on left down rectangle of this option you can save solution as image.
*July 6, 2011*

**algebra**

In google type: quadratic equation online When you see list of results click on: Free Online Quadratic Equation Solver:Solve by Quadratic Formula When page be open in rectangle type: t^2+10t+26=0 and click option: solve it! You will see solution step-by-step
*July 6, 2011*

**algebra**

6(x-2)=70 6*x-6*2=70 6x-12=70 6x=70+12 6x=82 Divide with 6 x=82/6 x=(78+4)/6 x=78/6 + 4/6 x=13 + 2/3 x=13.6666666666
*July 6, 2011*

**math**

45= 9*5 125= 25*5 6ã45-8ã125=6ã9*5-8ã25*5 ã9= 3 ã25=5 6ã9*5-8ã25*5=6*3*ã5-8*5*ã5=18*ã5-40*ã5= -22ã5 6&...
*June 29, 2011*

**dy/dx**

Did You mean: [ln(2x^2-3x)]^4 OR ln[(2x^2-3x)^4] Go to: wolframalpha dot com When page be open in rectangle type your function and click option = After few seconds you will see all about your function. Then click option Derivative:Show steps. When you see steps you click on ...
*June 28, 2011*

**Pre-Calc**

In google type: wolfram alpha When you see list of results click on: Wolfram Alpha:Computational Knowledge Engine When page be open in rectangle type: solve x^(4/3)+x^(2/3)=28 and click option = After few seconds you will see solution. Then click option: Show steps
*June 23, 2011*

**calculus**

In google type: wolfram alpha When you see list of results click on: Wolfram Alpha:Computational Knowledge Engine When page be open in rectangle type: lim 4-sqrt(x)/x-16 as x->16 and click option = After few seconds you wil see result. Then click option:Show steps
*June 22, 2011*

**the quadratic formula**

In google type: quadratic equation online When you see list of results click on: Free Online Quadratic Equation Solver:Solve by Quadratic Formula When page be open in rectangle type: 15t^2+7t=2 and click option: solve it You will see solution step-by step
*June 19, 2011*

**calculus**

Proof: x/2 + 6 = x/3 + 1 2 36/2 + 6 = 36/3 + 12 18 + 6 = 12 +12 24 = 24
*June 17, 2011*

**calculus**

x/2 + 6 = x/3 + 1 2 x/2 - x/3 = 12 - 6 [ Remark: x/2 = 3x/6 and x/3 = 2x/6 ] 3x/6 - 2x/6 = 6 (3x - 2x)/6 = 6 x/6 = 6 Multiply both sides with 6 x = 36
*June 17, 2011*

**math**

Go to: wolframalpha com When page be open in rectangle type: 1/x + 1/y = 1/14 and click option = When you see results couple times click option: More Solutions
*June 16, 2011*

**calculus**

In google type: wolfram alpha When you see list of results click on: Wolfram Alpha:Computation Knowledge Engine When page be open in rectangle type: sqrt((6x^2 + 5x + 1)^3) and click option = After few seconds you will see everything about that functions. Then click option: ...
*June 14, 2011*

**derivative **

In google type: wolfram alpha When you see list of results click on: Wolfram Alpha:Comutation Knowledge Engine When page be open in rectangle type: 2x^2(3-4x)^2 and click option = After few seconds you will see everything about that function. Then click option Derivative: Show...
*June 11, 2011*

**algebra**

go on: calc101 com When page be open click option: long division When page be open in rectangles type your polynoms and clik option DO IT
*June 9, 2011*

**Calculus AB**

In google type: wolfram alpha When you see list of results click on: Wolfram Alpha:Computational Knoweledge Engine When page be open in rectangle type: (x^2+5)/(x^3-x^2+x+3) and click option = After few secons you will see all about that function. Now click option: Partial ...
*June 5, 2011*

**Math - Logarithm**

(5+x)/(x-2)=2 5+x=2*(x-2) 5+x=2x-4 5+4=2x-x 9=x x=9
*June 5, 2011*

**Math**

tan(x/2) = [1 - cos(x)]/sin(x) tan(30°/2)=tan(15°) sin(30°)= 1/2 cos(30°)= sqroot(3)/2 tan(30°/2)=tan(15°)= [1 - cos(30°)]/sin(30°) = (1 - sqroot(3)/2)/(1/2) = 2 - sqroot(3) tan(15°) = 2 - sqroot(3) tan(345°)= -tan(15°) tan(345°...
*June 3, 2011*

**Math**

345°=360°-15° tan(A-B)=(tan A - tan B)/(1 - (tan A)*(tan B)) tan(360°)=0 tan(360°-15°)= tan(360°)-tan(15°)/(1-(tan(360°)*(tan(15°)) tan(360°-15°)= 0-tan(15°)/(1-0*(tan(15°)) tan(360°-15°)=tan(345°)= -tan(15&...
*June 3, 2011*

**Trig**

Remark: When you see step Simplify trigonometric functions: If we know that: tan^2(x)=sec^2(x)-1 tan^2(x)+sec^2(x)-1=0 becomes: sec^2(x)-1+sec(x)-1=0
*June 2, 2011*

**Trig**

In google type: wolfram alpha When you see lis of results click on: Wolfram Alpha:Computational Knowledge Engine When page be open in rectangle type: solve tan^2(x)=1-sec(x) and click option = After few secons you will see result. Then clic option Show steps
*June 2, 2011*

**math**

In google type : wolfram alpha When you see list of results click on: Wolfram Alpha: Computation Knowledge Engine When page be open in rectangle type: 4n^2+28n+49 and click option =
*May 31, 2011*

**math**

24x^4+24x^3=3x^2 Divide with 3x^2 8x^2+8x=1 8x^2+8x-1=0 If you dont know how to solve this equation in google type: quadratic equation online When you see list of results click on: Free Online Quadratioc Equation Solver:Solve by Quadratic Formula When page be open in rectangle...
*May 21, 2011*

**Math**

sqrt(32)=sqrt(2)*sqrt(16)=sqrt(2)*4 sqrt(50)=sqrt(2)*sqrt(25)=sqrt(2)*5 sqrt(128)=sqrt(2)*sqrt(64)=sqrt(2)*8 sqrt(32)-sqrt(50)+sqrt(128)= sqrt(2)*4-sqrt(2)*5+sqrt(2)*8= sqrt(2)*(4-5+8)= sqrt(2)*7 OR 7*sqrt(2)
*May 19, 2011*

**Algebra**

Go on this site: rechneronline.de/function-graphs In blue rectangle type your function and click option Draw
*May 19, 2011*

**math**

21+(9-7)*(5-4 )= 21 + 2*1 = 23
*May 17, 2011*

**Calculus**

In google type: wolfram alpha When you see list of results click on: Wolfram|Alpha;Cputational Knowledge Engine When page be open in rectangle type: (3x^2-28x-3)/(x^3-2x^2-3x) and click = You will see everybody about that expresion. Then click: Partial fraction expansion:Show ...
*May 15, 2011*

**Calculus**

If cos^-1(x^2) mean 1/cos(x^2) type cos[x^2]^(-1) If cos^-1(x^2) mean arccos(x^2) type arccos[x^2]
*May 13, 2011*

**Calculus**

In google type: calc101 When you see list of results click on first link. When page be open click option derivatives. When that page be open in rectangle type your function and click option DO IT. You will see solution step by step.
*May 13, 2011*

**math**

1km=1000m 1m=1/1000 km 5m=5/1000=0.005km
*May 12, 2011*

**algebra 2**

sin(2x)=2*sin(x)*cos(x) (1/2)sin(2x)=(1/2)*2*sin(x)*cos(x)=sin(x)*cos(x) (1/2)sin(2x)=sin(x)*cos(x)
*May 8, 2011*

**MATH HELP HELP HELP HELP HELP**

In google type: mathematical ciphers You will find something.
*May 8, 2011*

**Algebra**

8b+2x=6x-4a 8b+4a=6x-2x 8b+4a=4x 4x=4a+8b Divide with 4 x=a+2b
*May 8, 2011*

**math**

a(n+1)=a(n)/2 -5 a1=90 a2=90/2 -5= 45-5= 40 a3=40/2 -5= 20-5= 15 a4=15/2 -5= 7.5-5= 2.5 The next number is 2.5
*April 27, 2011*

**Calculus**

In google type calc101 When you see list of results click on: Calc101 com Automatic Calculus,linear Algebra,and Polynomals When page be open click option derivatives When that page be open in rectangle type your function and click option DO IT Type your equtations like that: x...
*April 18, 2011*

**pre cal**

sin(theta)=1/5 cos(theta)=sqroot[1-sin(teta)^2] cos(theta)=sqroot[1-(1/5)^2] cos(theta)=sqroot(1-1/25) cos(theta)=sqroot(25/25-1/25) cos(theta)=sqroot(24/25) cos(theta)=sqroot(6*4/25) cos(theta)=sqroot(6*2^2/5^2) cos(theta)=(2/5)*sqroot(6) sin(2theta)=2*sin(theta)*cos(theta) ...
*April 17, 2011*

**Calculus**

If you try to see graph of that function you can see that function: x^3-4x+5 havent absolute maximum or absolute minimum.
*April 17, 2011*

**Calculus**

Sorry: Second derivate=6x 6*1.1547005383792515290182975610039= 6.9282032302755091741097853660235>0 Function has local minimum for x=1.1547005383792515290182975610039 f(x)min=f(1.1547005383792515290182975610039)= 1.9207985643219959226178731706562
*April 17, 2011*

**Calculus**

Functionn has local maximum or minimum where first derivation=0 If second derivate<0 that is local maximum If second derivate>0 that is local minimum First derivation=3x^2-4=0 x=+/- 2/sqroot(3) sqroot(3)=1.7320508075688772935274463415059 x=+/- 2/1....
*April 17, 2011*

**algebra 1**

In google type: functions graphs online When you see list of results click on: rechneronline.de/function-graphs/ You will see graph of quadractic function.
*April 17, 2011*