Tuesday

October 25, 2016
Total # Posts: 2,239

**Algebra 2**

Quadratic function: y = a x ^ 2 + b x + c has minimum or maximum in point x = - b / 2 a If a > 0 quadratic function has minimum If a < 0 quadratic function has maximum In your case : a = - 5 , b = 10 , c = 1 Function has maximum in point : - b / 2 a = - 10 / [ 2 * ( - 5...

*May 1, 2012*

**math**

The area between the graph of y = f(x) and the x-axis is given by the definite integral: A = definite integral f(x) dx from a to b

*May 1, 2012*

**math**

3 x – y = - 6 3 x + 6 = y y = 3 x + 6 4 x – 3 y = - 3 4 x - 3 ( 3 x + 6 ) = - 3 4 x - 3 * 3 x - 3 * 6 = - 3 4 x - 9 x - 18 = - 3 - 5 x - 18 = - 3 - 5 x = - 3 + 18 - 5 x = 15 Divide both sides by - 5 x = 15 / - 5 x = - 3 y = 3 x + 6 y = 3 * ( - 3 ) + 6 y = - 9 + 6 y...

*May 1, 2012*

**Algebra**

A. 6 + 9 = 15 4 ÷ 1 = 4 ( 6 + 9 ) − 1 + ( 4 ÷ 1 ) = 12 15 - 1 + 4 = 12 14 + 4 = 12 18 = 12 FALSE B. 12 ÷ 4 = 3 9 + ( 12 ÷ 4 ) = 1 9 + 3 = 1 12 = 1 FALSE C. 8 + 4 = 12 24 ÷ ( 8 + 4 ) = 24 ÷ 12 = 2 ( 16 ÷ 2 ) = 8 24 ÷...

*May 1, 2012*

**ALGEBRA**

If (5 x - 1)(x**2 + 4 x - 3) mean ( 5 x - 1 )( x ^ 2 + 4 x - 3 ) then ( 5 x - 1 )( x ^ 2 + 4 x - 3 )= 5 x * x ^ 2 + 5 x * 4 x + 5 x * ( - 3 ) - 1 * x ^ 2 - 1 * 4 x - 1 * ( - 3 ) = 5 x ^ 3 + 20 x ^ 2 - 15 x - x ^ 2 - 4 x + 3 = 5 x ^ 3 + 19 x ^ 2 - 19 x + 3

*April 30, 2012*

**ALGEBRA**

6 <= 5 - y 6 - 5 <= - y 1 <= - y Multiply both sides by -1 ______________________________________ Remark : If you multiply or divide both sides of an inequality by a negative number, you must reverse the direction of the inequality sign. ...

*April 30, 2012*

**Algebra**

- 4 x + 1 - 2 ( x - 1 ) = - 4 ( x - 4 ) - 4 x + 1 - 2 * x - 2 * ( - 1 ) = - 4 * x - 4 * ( - 4 ) - 4 x + 1 - 2 x + 2 = - 4 x + 16 - 4 x - 2 x + 1 + 2 = - 4 x + 16 - 6 x + 3 = - 4 x + 16 - 6 x + 4 x = 16 - 3 - 2 x = 13 Divide both sides by - 2 x = 13 / - 2 = - 13 / 2 x = - 6.5

*April 29, 2012*

**Math**

ð = pi

*April 29, 2012*

**Math**

A = 2 ð r h + 2 ð r ^ 2 2 ð r 10 + 2 ð r ^ 2 = 200 Divide both sides by 2 ð 10 r + r ^ 2 = 100 / ð r ^ 2 + 10 r - 100 / ð = 0 100 / ð = 31.831 Y>ou nust solve equation : r ^ 2 + 10 r - 31.831 = 0 The solutions are : 2.54 in and - 12.54 in ...

*April 29, 2012*

**Math-helpppppp**

1) P = Your polynome P / ( x -3 ) = x ^ 2 + 2 x - 5 - 3 / ( x - 3 ) Multiply both sides by ( x - 3) P = ( x ^ 2 + 2 x - 5 ) * ( x - 3 ) - 3 * ( x - 3 ) / ( x - 3 ) P = x * x ^ 2 + x * 2 x - 5 * x - 3 * x ^ 2 - 3 * 2 x - ( - 3 ) * 5 - 3 * 1 P = x ^ 3 + 2 x ^ 2 - 5 x - 3 x ^ 2...

*April 28, 2012*

**algebra 2/trig**

1) a (n ) = n ^ 3 1 ^ 3 = 1 2 ^ 3 = 8 3 ^ 3 = 27 4 ^ 3 = 64 5 ^ 3 = 125 6 ^ 3 = 216 2 ) a (n ) = n ^ 2 + 2 n 1 ^ 2 + 2 * 1 = 1 + 2 = 3 2 ^ 2 + 2 * 2 = 4 + 4 = 8 3 ^ 2 + 2 * 3 = 9 + 6 = 15 4 ^ 2 + 2 * 4 = 16 + 8 = 24 5 ^ 2 + 2 * 5 = 25 + 10 = 35 6 ^ 2 + 2 * 6 = 36 + 12 = 48

*April 28, 2012*

**MATH**

sqrt ( 6 ^ 2 + 8 ^ 2 ) = sqrt ( 36 + 64 ) = sqrt ( 100 ) = 10 ft

*April 28, 2012*

**Pre-Calculus**

1 / 5 = 0.2 1 / 198 = 0.0050505050 7 * 1 / 198 = 7 / 198 = 0. 0353535 1.23535353535 = 1 + 1 / 5 + 7 / 198 198 * 5 = 990 1 = 990 / 990 1 / 5 = 1 * 198 / 990 = 198 / 990 7 / 198 = 5 * 7 / 990 = 35 / 990 1 + 1 / 5 + 7 / 198 = 990 / 990 + 198 / 990 + 35 / 990 = 1223 / 990

*April 28, 2012*

**Pre-Calculus**

1223 / 990

*April 28, 2012*

**ALGEBRA**

What is your question ?

*April 28, 2012*

**Engineering Calculus**

If fŒ(x) > 0 at each point in an interval I, then the function is said to be increasing on I. fŒ(x) < 0 at each point in an interval I, then the function is said to be decreasing on I. In your case : fŒ(x) = 39 /( x + 6 ) ^ 2 39 positive...

*April 28, 2012*

**math**

x ^ 4 + 2 x ^ 2 - 15 = 0 Substitute : u = x ^ 2 ________________________________ Remark : If u = x ^ 2 then x ^ 4 = u ^ 2 ________________________________ You must solve equation : u ^ 2 + 2 u - 15 = 0 The exact solutions are : u = 3 and u = - 5 So solutions are : x ^ 2 = 3 x...

*April 28, 2012*

**Polynomials and quadratic application**

W = The width of fence L = Length of house = third side of fence 2 W + L = 60 ft L = 60 - 2 W A = W * L A = W * ( 60 - 2 W ) A = 60 W - 2 W ^ 2 Now you must use calculus : If a first derivative of a function at some point is equal to zero function has maxsimum or minimum. If ...

*April 28, 2012*

**Math**

4(x+y)]/(5x^2y^3) ÷ (-2x-2y)/10 = 10 * 4 ( x + y ) / [ ( 5 x ^ 2 y ^ 3 ) * ( - 2 x - 2 y ) ] = 40 ( x + y ) / [ ( 5 x ^ 2 y ^ 3 ) * - 2 ( x + y ) ] = 40 / - 2 * 5 x ^ 2 y ^ 3 ) = 40 / - 10 ( x ^ 2 y ^ 3 ) = - 4 / x ^ 2 y ^ 3

*April 27, 2012*

**Algebra**

4 k ( k + 13 ) = 13 4 k * k + 4 k * 13 = 13 4 k ^ 2 + 52 k = 13 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: 4 k ^ 2 + 52 k = 13 and click ...

*April 26, 2012*

**math**

( a + b ) ^ 4 = a ^ 4 + 4 a ^ 3 b + 6 a ^ 2 b ^ 2 + 4 a b ^ 3 + b ^ 4 ( p ^ 2 + 3 h ) ^ 4 = ( p ^ 2 ) ^ 4 + 4 ( p ^ 2 ) ^ 3 * 3 h + 6 ( p ^ 2 ) ^ 2 * ( 3 h ^ 2 ) + 4 p ^ 2 * ( 3 h ) ^ 3 + ( 3 h ) ^ 4 = p ^ 8 + 12 p ^ 6 h + 18 p ^ 4 * 3 h ^ 2 + 4 p ^ 2 * 27 h ^ 3 + 81 h ^ 4 = p...

*April 26, 2012*

**math**

Go on: wolframalpha dot com When page be open in rectangle type: derivative (3x+2)(x^2-7) and click option = After few seconds when you see result click option: Show steps Then in rectangle type: derivative x^3+3y^2=36 and click option = After few seconds when you see result ...

*April 26, 2012*

**math**

1 m = 100 cm 1 cm = 1 / 100 m 0.1959 / 100 = 0.001959 0.1959 cm = 0.001959 m

*April 26, 2012*

**math**

( 1 / 3 ) * 24 = 24 / 3 = 8

*April 26, 2012*

**math**

2 2 / 3 = 2 + 2 / 3 = 6 / 3 + 2 / 3 = 8 / 3 10 2 / 3 = 10 + 2 / 3 = 30 / 3 + 2 / 3 = 32 / 3 2 2 / 3 / 10 2 / 3 = ( 8 / 3 ) / ( 32 / 3 ) = 3 * 8 / ( 3 * 32 ) = 8 / 32 = 8 / ( 4 * 8 ) = 1 / 4

*April 25, 2012*

**trig**

sin ( x ) = 5 / 12 cos ( x ) = + OR - sqrt [ 1 - sin ^ 2 ( x ) ] cos ( x ) = + OR - sqrt [ 1 - ( 5 / 1 3 ) ^ 2 ] cos ( x ) = + OR - sqrt ( 1 - 25 / 169 ) cos ( x ) = + OR - sqrt ( 169 / 169 - 25 / 169 ) cos ( x ) = + OR - sqrt ( 144 / 169 ) cos ( x ) = + OR - 12 / 13 In ...

*April 24, 2012*

**Algebra**

If 12 times the square root of z-1=3 times the square root 3z+1050 mean : 12 * sqrt ( z - 1 ) = 3 * sqrt ( 3 z + 1050 ) then : 12 * sqrt ( z - 1 ) = 3 * sqrt ( 3 z + 1050 ) squared both sides 12 ^ 2 * ( z - 1 ) = 3 ^ 2 * ( 3 z + 1050 ) 144 * ( z - 1 ) = 9 * ( 3 z + 1050 ) 144 ...

*April 24, 2012*

**Math Help**

y = 3 x + 1 y - 1 = 3 x Divide both sides by 3 ( y - 1 ) / 3 = x x = ( y - 1 ) / 3 y = 5 x - 3 y = 5 * ( y - 1 ) / 3 - 3 y = ( 5 / 3 ) * ( y - 1 ) - 3 y = 5 y / 3 - 5 / 3 - 3 y = 5 y / 3 - 5 / 3 - 9 / 3 y = 5 y / 3 - 14 / 3 y - 5 y / 3 = - 14 / 3 3 y / 3 - 5 y / 3 = - 14 / 3...

*April 23, 2012*

**trigonometry**

¡Ü mean less than or equal to

*April 23, 2012*

**trigonometry**

6 cos ^ 2 ( x ) + sin ( x ) = 4 Then : 6 * [ 1 - sin ^ 2 ( x ) ] + sin ( x )= 4 6 - 6 sin ^ 2 ( x ) + sin ( x ) = 4 - 6 sin ^ 2 ( x ) + sin ( x ) + 6 - 4 = 0 - 6 sin ^ 2 ( x ) + sin ( x ) + 2 = 0 Substitution : sin ( x ) = u - 6 u ^ 2 + u + 2 = 0 The exact solutions are : u = ...

*April 23, 2012*

**math**

tan ( theta ) = 100 / 150 = 2 * 50 / ( 3 * 50 ) tan ( theta ) = 2 / 3 theta = tan ^ - 1 ( 2 / 3 ) theta = 33.69 ° theta = 34 ° ( to the nearest degree ) Remark : tan ^ - 1 ( 2 / 3 ) is the inverse tangent function of 2 / 3

*April 23, 2012*

**math 1**

Set of known values: x = 1 , y = 280 x = 2 , y = 480 x = 3 , y = 684 x = 4 , y = 913 x = 5 , y = 1205 x = 6 , y = 1615 The interpolating polynomial is : y = ( 17 x ^ 4 - 86 x ^ 3 + 139 x ^ 2 + 4730 x + 1920 ) / 24 For x = 7 , y = 2215 Next term : 2215

*April 23, 2012*

**6th G-Math**

0 + 1 = 1 0 + 6 = 6 1 + 1 = 2 6 + 6 = 12 Table A

*April 23, 2012*

**Science**

In google type : increase the thermal energy of water You will find many sites

*April 23, 2012*

**Math Help**

y = 3 x y - x = 4 3 x - x = 4 2x = 4 Divide both sides by 2 x = 4 / 2 = 2 y = 3 x y = 3 * 2 = 6

*April 23, 2012*

**algebra**

L = Length W = Width A square has sides of equal length. In this case : L - 3 = W + 5 L = W + 5 + 3 L = W + 8 L = 2 W 2 W = W + 8 2 W - W = 8 W = 8 cm L = 2 W L = 2 * 8 = 16 cm

*April 22, 2012*

**math**

x ^ a * x ^ b = x ^ ( a + b ) 5.2 * 10 ^ 3 * 6.5 * 10 ^ 7 = 5.2 * 6.5 * 10 ^ 3 * 10 ^ 7 = 33.8 * 10 ( 3 + 7 ) = 33.8 * 10 ^ 10 = 3.38 * 10 * 10 ^ 10 = 3.38 * 10 ^ 1 * 10 ^ 10 = 3.38 * 10 ^ ( 1 + 10 ) = 3.38 * 10 ^ 11

*April 22, 2012*

**pre-calc help**

sin ^ 2 ( x ) + cos ^ 2 ( x ) = 1 sin ^ 2 ( x ) = 1 - cos ^ 2 ( x ) sin ^ 2 ( x / 2 ) = 1 - cos ^ 2 ( x / 2 ) cos ^ 2 ( x / 2 ) - sin ^ 2 ( x / 2 ) = cos ^ 2 ( x / 2 ) - [ 1 - cos ^ 2 ( x / 2 ) = cos ^ 2 ( x / 2 ) - 1 + cos ^ 2 ( x / 2 ) = 2 cos ^ 2 ( x / 2 ) - 1 cos ^ 2 ( x...

*April 21, 2012*

**Algebra**

a x ^ 2 + b x + c = a ( x - x1 ) ( x - x2 ) a leading coefficient x1 and x2 roots In this case : x 1 = - sqrt ( 3) x 2 = 3 sqrt ( 3 ) a x ^ 2 + b x + c = a [ ( x - ( - sqrt ( 3 ) ) ] * [ ( x - 3 sqrt ( 3 ) ) = a [ ( x + sqrt ( 3 ) ) ] * [ ( x - 3 sqrt ( 3 ) ) = a [ x * x + x...

*April 21, 2012*

**Algebra**

a x ^ 2 + b x + c = a ( x - x1 ) ( x - x2 ) In this case : x 1 = sq

*April 21, 2012*

**Math**

a x ^ 2 + b x + c = a ( x - x1 ) ( x - x2 ) a leading coefficient x1 and x2 roots In this case : x 1 = - 5 x 2 = - a [ x - ( - 5 ) ] * [ x - ( - 2 ) ] = a ( x + 5 ) * ( x + 2 ) = a ( x * x + x * 5 + 2 * x + 2 * 5 ) = a ( x ^ 2 + 5 x + 2 x + 10 ) = a ( x ^ 2 + 7 x + 10 ) a ( x...

*April 21, 2012*

**Inequalities**

Go on: wolframalpha dot com When page be open in rectangle type: ( x-3)^2/9 + (y+2)^2/4<=1 , (x-3)^2+(y+2)^2>=4 and click option = After few seconds you will see everything about your inequalities,including graph.

*April 21, 2012*

**Trig.**

Are you kidding? 6 x = sqrt ( 20 ) + 6 x 6 x - 6 x = sqrt ( 20 ) 0 = sqrt ( 20 ) ???????????

*April 21, 2012*

**Math**

Substitute : cos ( theta ) = u 6 cos ^ 2 ( theta ) + 5 cos ( theta ) = 1 6 u ^ 2 + 5 u = 1 6 u ^ 2 + 5 u - 1 = 0 The exact solutions are : u = 1 / 6 cos ( theta ) = 1 / 6 theta = cos ^ - 1 ( 1 / 6 ) _________________________________ cos ^ - 1 is the inverse cosine function ...

*April 21, 2012*

**geometry**

Each exterior angle = 360 ° / n where: n = the number of sides

*April 21, 2012*

**math**

( 20 + 2 + 2 ) * ( y + 2 + 2 ) = ( 20 + 4 ) * ( y + 4 ) = 24 * ( y + 4 ) = 24 y + 24 * 4 = 24 y + 96 [ m ^ 2 ]

*April 21, 2012*

**MATH**

Remark : 2 / 6 = 1 / 3 2 / 6 / 7 = ( 2 / 6 ) / 7 = ( 1 / 3 ) / 7 = 1 / ( 3 * 7 ) = 1 / 21 ( 1 / 21 ) * ( 3 / 2 ) = 3 * 1 / ( 21 * 2 ) = 3 * 1 / ( 3 * 7 * 2 ) 1 / ( 7 * 2 ) = 1 / 14

*April 20, 2012*

**Algebra, Please Help!**

2 x + 6 - 6 > 10 - 6 2x > 4 Divide both sides by - 2 Whenever you multiply or divide an inequality by a negative number, you must change the direction of the inequality. In tis case : ( 2 x / - 2 ) < ( 4 / - 2 ) - x < - 2 Multiply both sides by - 1 You again must ...

*April 20, 2012*

**Math**

1 revolution = 2 pi radians 1.73 * 2 * 3.1416 = 10.87 radians / sec

*April 18, 2012*

**change decimal to fraction**

If 0.31 1/4 mean: 0.31 * 1 / 4 then: ( 0.31 * 100 ) / ( 4 * 100 ) = 31 / 400

*April 18, 2012*

**math**

b = numbers of books t = numbers od towels b = 3 t Total price : ( b + t ) * 8 = 64 ( 3 t + t ) * 8 = 64 4 t * 8 = 64 32 t = 64 Divide both sides by 32 t = 64 / 32 = 2 2 towels b = 3 t b = 3 * 2 = 6 6 books 2 * 8 $ + 6 * 8 $ = 16 $ + 48 $ = 64 $

*April 18, 2012*

**math**

Go on: wolframalpha dot com When page be open in rectangle type: derivative x+1+1/(x+2) and click option = After few seconds when you see result click option: Show steps

*April 18, 2012*

**MATHS**

456 / 2 = 228 ( 228 Adult + 456 Child ) * 21 $ = 228 * 21 $ = 4,788 $ 234 Adult - 228 Adult = 6 Adult 6 Adult * 10 $ = 60 $ 4,788 $ + 60 $ = 4,848 $

*April 18, 2012*

**Math**

[ ( 85 - 75 ) / 75 ] * 100 % = 10 * 100 °% / 75 = 1000 % / 75 = 13.33 %

*April 18, 2012*

**Math**

4 ( x + 3 ) = 24 4 * x + 4 * 3 = 24 4 x + 12 = 24 4 x = 24 - 12 4 x = 12 Divide both sides by 4 x = 12 / 4 x = 3 5 ( x + 2 ) = 45 5 * x + 5 * 2 = 45 5 x + 10 = 45 5 x = 45 - 10 5 x = 35 Divide both sides by 5 x = 35 / 5 x = 7 5 + 4 x = 13 4 x = 13 - 5 4 x = 8 Divide both sides...

*April 18, 2012*

**math grade 12**

( a - b ) * ( a + b ) = a ^ 2 - b ^ 2 ( y ^ 2 - 2 ) * ( y ^ 2 + 2 ) = ( y ^ 2 ) ^ 2 - ( 2 ^ 2 ) ^ 2 = y ^ 4 - 4 ( y ^ 2 - 2 ) ^ 6 * ( y ^ 2 + 2 ) ^ 6 = [ ( y ^ 2 - 2 ) * ( y ^ 2 + 2 ) ] ^ 6 = ( y ^ 4 - 4 ) ^ 6 ( a - b ) ^ 6 = a^6-6 a^5 b+15 a^4 b^2-20 a^3 b^3+15 a^2 b^4-6 a b^...

*April 17, 2012*

**mathematics**

Go on: wolframalpha dot com When page be open in rectangle type: inegrate (x^2)/sqrt(x^2+25) and click option = After few seconds when you see result click option: Show steps

*April 17, 2012*

**math**

A = Aarons current age S = Shelbys current age A = S + 13 In nine years aaron will be twice as old as shelby: ( A + 9 ) / ( S + 9 ) = 2 ( S + 13 + 9 ) / ( S + 9 ) = 2 ( S + 22 ) / ( S + 9 ) = 2 Multiply both sides by ( S + 9 ) S + 22 = 2 ( S + 9 ) S + 22 = 2 S + 18 22 - 18 = 2...

*April 15, 2012*

**math**

64 = 8 ^ 2 sqrt ( 64 ) = 8 3 sqrt ( -64 x ^ 3 ) = 3 * 8 * sqrt ( - x ^ 3 ) = 24 sqrt ( - x ^ 3 )

*April 15, 2012*

**Geometry**

How the length can be larger of the perimeter ?????

*April 15, 2012*

**Geometry!**

d pi = 378,675 Divide both sides by pi d = 378,675 / pi d = 378,675 / 3.14 d = 120.597,133 km Answer D)

*April 15, 2012*

**Geometry**

The circumference of the circle = 2 r pi The measure of the sector 90 ° = ( 1 / 4 ) 2 r pi = r pi / 2 r pi / 2 = 3 pi Divide both sides by pi r / 2 = 3 Multiply both sides by 2 r = 2 * 3 r = 6 cm

*April 15, 2012*

**Math 7 - NYS Math Exam Review Help!**

pi = 3.14 2 pi = 6.28 C = 2 r pi 25.12 = 2 r pi Divide both sides by 2 pi 25.12 / 2 pi = r r = 25.12 / 2 pi r = 25.12 / 6.28 r = 4 cm

*April 15, 2012*

**math**

8 x ^ 2 * y * ( - 2 x * y ^ 3 ) = 8 * ( - 2 ) * x ^ 2 * x * y * y ^ 3 = - 16 x ^ 3 y ^ 4

*April 15, 2012*

**MATH**

x ^ 2 - 3 x + 2 + ( 5 x ^ 2 - 3 x -8 ) )= x ^ 2 + 5 x ^ 2 - 3 x + ( - 3 x ) + 2 + ( - 8 ) = 6 x ^ 2 - 3 x - 3 x + 2 - 8 = 6 x ^ 2 - 6 x - 6 = 6 ( x ^ 2 - x - 1 )

*April 15, 2012*

**Math**

x ^ a * x ^ b = x ^ ( a + b ) 5 ^ 4 * 5 ^ 7 = 5 ^ ( 4 + 7 ) = 5 ^ 11 x ^ a / x ^ b = x ^ ( a - b ) 5 ^ 11 / 5 ^ 8 = 5 ^ ( 11 - 8 ) = 5 ^ 3 5 ^ 4 * 5 ^ 7 / 5 ^ 8 = 5 ^ 3 = 125

*April 15, 2012*

**Math**

x / 60 = 9 / 5 Multiply both sides by 60 x = 9 * 60 / 5 x = 540 / 5 x = 108

*April 15, 2012*

**math**

1 h = 60 min 5 h 30 min + 35 min = 5 h + 65 min = 5 h + 60 min + 5 min = 5 h + 1 h + 5 min = 6 h 5 min = 6:05

*April 15, 2012*

**math**

x6 = 480 - 440 x6 = 40

*April 15, 2012*

**math**

( x1 + x2 + x3 + x4 + x5 + x6 ) / 6 = 80

*April 15, 2012*

**math**

Mean score of tests : ( x1 + x2 + x3 + x4 + x5 ) / 5 = 88 Multiply both sides by 5 x1 + x2 + x3 + x4 + x5 = 88 * 5 x1 + x2 + x3 + x4 + x5 = 440 Mean score of six tests : ( x1 + x2 + x3 + 4 + x5 + x6 ) / 6 = 80 [ ( x1 + x2 + x3 + 4 + x5 ) + x6 ] / 6 = 80 ( 440 + x6 ) / 6 = 80 ...

*April 15, 2012*

**math**

105 ° = 210 ° / 2 210 ° = 180 ° + 30 ° cos ( A + B ) = cos ( A ) * cos ( B ) - sin ( A ) * sin ( B ) sin 30 ° = 1 / 2 sin 180 ° = 0 cos 30 ° = sqrt ( 3 ) / 2 cos 180 ° = - 1 cos 210 ° = cos ( 180 ° + 30 ° ) = cos 180 ° * cos ...

*April 15, 2012*

**math**

cos ^ 4( x ) - sin ^ 4 ( x ) = [ cos ^ 2 ( x ) ] ^ 2 - [ sin ^ 2 ( x ) ] ^ 2 = ______________________________________ Remark: a ^ 2 - b ^ 2 = ( a + b ) * ( a - b ) ______________________________________ = [ cos ^ 2 ( x ) + sin ^ 2 ( x ) ] * [ cos ^ 2 ( x ) - sin ^ 2 ( x ) ] = ...

*April 15, 2012*

**Calculus I**

Go on: wolframalpha dot com When page be open in rectangle type: inegrate tan 2x dx and click option = After few seconds when you see result click option: Show steps

*April 14, 2012*

**math**

If h = -16t^2 + 156t + 105 = 0 then 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: 16t^2 + 156t + 105 = 0 and click option: solve it! You wil...

*April 14, 2012*

**Calculus**

A) y'= - 2sin(2x) B) y'= 4 sin ( 2 theta ) + 2 cos ( 2theta ) = 2 [ 2 sin (2 theta ) + cos ( theta ) ] C) y'= 2piCos(2theta)

*April 14, 2012*

**Calculus**

Go on: wolframalpha dot com When page be open in rectangle type: derivative cos(2x) and click option = After few seconds when you see result click option: Show steps Then in in rectangle type: derivative sin(2theta)-2cos(2theta) and click option = then Show steps C) sin ( ...

*April 14, 2012*

**Math**

2 integral | x | dx = 2 ( x ^ 2 ) / 2 * sgn ( x ) + C = ( x ^ 2 ) * sgn ( x ) + C =

*April 14, 2012*

**Math**

integral | 2 x | dx = 2 integral | x | dx = 2 ( x ^ 2 ) * sgn ( x ) + C = integral | 2 x | dx from - k to k = k ^ 2 - [ ( k ^ 2 ) * ( - 1 ) ] = k ^ 2 + k ^ 2 = 2 k ^ 2 2 k ^ 2 = 18 Divide both sides by 2 k ^ 2 = 9 k = sqrt ( 9 ) = ± 3 integral | 2 x | dx from - 3 to 3...

*April 14, 2012*

**math**

65 % = 65 /100 611 / 65 % = 611 / ( 65 / 100 ) = 100 * 611 / 65 = 61,100 / 65 = 940 OR 65 % = 65/100 = 0.65 611 / 0.65 = 940

*April 14, 2012*

**Bio Anatomy**

In google type: detail pathology the occipital lobe yo will find many sites

*April 14, 2012*

**algebra**

L = Length W = Width P = Perimeter P = 2 L + 2 W 2 ( L + W ) = P 2 ( 23 + W ) > 72 Diwide both sides by 2 23 + W > 72 / 2 23 + W > 36 W > 36 - 23 W > 13 cm

*April 14, 2012*

**Calculus. I need help!**

Go on: wolframalpha dot com When page be open in rectangle type: çã(cotx)csc^2xdx and click option = After few seconds when you see result click option: Show steps Then in in rectangle type: çsec^3xtanxdx and click option = then Show steps

*April 14, 2012*

**algebra2**

ã =square root

*April 14, 2012*

**algebra2**

If ã3:(63x^5/(72y^6)) mean ã 3 /( 63 x ^ 5 / ( 72 y ^ 6 ) ) then : ã 3 / ( 63 x ^ 5 / ( 72 y ^ 6 ) ) = ã 3 * 72 y ^ 6 / ( 63 x ^ 5 ) = ã 3 * 9 * 8 * y ^ 6 / ( 9 * 7 x ^ 5 ) = 8 ã 3 * y ^ 6 / 7 x ^ 5

*April 14, 2012*

**math**

Go on: wolframalpha dot com When page be open in rectangle type: y'+6y=12 y(2)=10 and click option = After few seconds when you see result click option: Show steps

*April 13, 2012*

**Math**

63 / 17500 = 7 * 9 / ( 7 * 2500 ) = 9 / 2500 = 4 * 9 / ( 4 * 2500 ) = 36 / 10000 = 0.0036 102 / 125 = 8 * 102 / ( 8 * 125 ) = 816 / 1000 = 0.816

*April 13, 2012*

**algabra**

k ( x ) = 12 x k ( - 19 ) x = - 19 k = 12 * ( - 19 ) = - 228 k ( - 19 ) = - 228 k ( 10 ) x = 10 k = 12 * 10 = 120 k ( 10 ) = 120 k ( 21 ) x = 21 k = 12 * 21 = 252 k ( 21 ) = 252

*April 13, 2012*

**math**

1 ft = 12 in 1 yd = 3 ft 1 yd = 36 in

*April 13, 2012*

**Algebra 2**

If ã(21x^2y/(75xy^5) mean: sqrt ( 21 * x^2 * y / ( 75 * x * y^5)) then: sqrt ( 21 * x^2 * y / ( 75 * x * y^5) ) = sqrt ( 3 * 7 * x^2 * y / ( 3 * 25 * x * y^5 ) ) = sqrt ( 7 * x / ( 25 * y^4 ) ) = sqrt ( 7 x ) / sqrt ( 25 y^4) = sqrt ( 7 x ) / 5 y^2

*April 13, 2012*

**Math**

2 / 19 = x / 76 Multiply both sides by 76 2 * 76 / 19 = x 152 / 19 = x 8 = x x = 8 in

*April 11, 2012*

**Math**

Truck A is carrying more.

*April 11, 2012*

**Math**

Truck A is carrying 2.5 tons = 2.5 * 2,000 = 5,000 lb Truck is A carrying more?

*April 11, 2012*

**math**

A quarters is worth 25 cents and a dime is worth 10 cents. q = numbers of a quarters d = numbers of a dimes q + d = 8 q = 8 - d Value of money : 10 ¢ * d + 25 ¢ * q = 170 ¢ 10 d + 25 q = 170 10 d + 25 ( 8 - d ) = 170 Equation b. 10 d + 25 ( 8 - d ) = 170 10 d + ...

*April 11, 2012*

**math**

I send to you solution for simmilar problem.

*April 11, 2012*

**math**

1 ft = 12 in 1 ft ^ 3 = 12 ^ 3 in ^ 3 1 ft ^ 3 = 1728 in ^ 3 3 ft ^ 3 = 3 * 1728 = 5184 in ^ 3 5184 / 0.5 = 5184 * 2 = 10368 sugar cubes

*April 11, 2012*

**math**

A nickel is worth 5 cents and a dime is worth 10 cents. n = numbers of a nickels d = numbers of a dimes n + d = 8 n = 8 - d Value of money : 10 ¢ * d + 5 ¢ * n = 60 ¢ 10 d + 5 n = 60 10 d + 5 ( 8 - d ) = 60 Equation c. 10 d + 5 ( 8 - d ) = 60 10 d + 5 * 8 + 5...

*April 11, 2012*

**algebra 2**

b / 3 + 6 = 82 b / 3 = 82 - 6 b / 3 = 76 Multiply both sides by 3 b = 76 * 3 b = 228

*April 11, 2012*

**Algebra**

9 x + y = 2 -4 x- y = 17 Add ______________ 9 x + ( - 4x ) + y + ( - y ) = 2 + 17 9 x - 4 x + y - y = 2 + 17 5 x + 0 = 19 5 x = 19 Divide both sides by 5 x = 19 / 5 = 3.8 9 x + y = 2 9 * 19 / 5 + y = 2 171 / 5 + y = 2 y = 2 - 171 / 5 y = 10 / 5 - 171 / 5 y = - 161 / 5 y = - 32.2

*April 11, 2012*

**calculus**

Go on: wolframalpha dot com When page be open in rectangle type: y'=xye^x; y(1)=1 and click option = After few seconds when you see result click option: Show steps

*April 10, 2012*