Tuesday

February 28, 2017
Total # Posts: 2,360

**Calc**

Go on : wolframalpha dot com When page be open in rectangle type: integrate dP/dt = 0.5(800-P) and click option = When you see result click option: Show steps

*May 6, 2012*

**Algebra**

2 / 3 - 4 / 5 - ( - 11 / 15 ) + 7 / 10 - 5 / 2 = 2 / 3 - 4 / 5 + 11 / 15 + 7 / 10 - 5 / 2 ______________________________________ Least Common factor = 30 2 / 3 = 20 / 30 4 / 5 = 4 * 6 / ( 5 * 6 ) = 24 / 30 11 / 15 = 2 * 11 / ( 2 * 15 ) = 22 / 30 7 / 10 = 3 * 7 / ( 3 * 10 ) = ...

*May 5, 2012*

**Math**

Circumference : C = 2 r pi C = 2 r pi Divide both sides by 2 pi C / 2 pi = r r = C / 2 pi r = 37.68 / ( 2 * 3.14 = r = 37.68 / 6.28 r = 6 cm Area: A = 4 r ^ 2 pi A = 4 * 6 ^ 2 * pi A = 4 * 36 * pi A = 144 pi A = 144 * 3.14 A = 452.16 cm ^ 2

*May 5, 2012*

**math**

1 / x + 3 / x ^ 2 = - 1 Multiply both sides by x ^ 2 x ^ 2 * 1 / x + 3 * x ^ 2 / x ^ 2 = - x ^ 2 x + 3 = - x ^ 2 x ^ 2 + x + 3 = 0 In google type: quadratic equation online When you see list of results click on: Free Online Quadratic Equation Solver:Solve by Quadratic Formula ...

*May 5, 2012*

**math**

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: 6x^2+12x+5=0 and click option: solve it You will see solution step-by step

*May 5, 2012*

**math**

| x - 4 |-| 7 - x | = 1 | x - 4 | = 1 + | 7 - x | Eliminate the absolute values: First equation : ( - ( x - 4 ) ) = ( 7 - x ) + 1 Second equation : ( x - 4 ) = ( 7 - x ) + 1 Third equation : ( x - 4 ) = ( - ( 7 - x ) ) + 1 Fourth equation : ( x - 4 ) = ( 7 - x ) + 1 You have ...

*May 5, 2012*

**Math - patterns**

Prime numbers sequensce. A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. 2 , 3 , 5 , 7 , 11 , 13 , 17

*May 4, 2012*

**math models**

1 ft = 12 in 1 ft ^ 2 = 12 ^ 2 = 144 in ^ 2 Areaa od a kitchen Ak = 20 * 16 = 320 ft ^ 2 Ak = 320 ft ^ 2 = 320 * 144 = 46,080 in ^ 2 Area of tiles At = 6 * 6 = 36 in ^ 2 Numbers of a tiles n = Ak / At n = 46,080 / 36 = 1280 OR 20 ft = 20 * 12 = 240 in One side of tiles = 6 in ...

*May 4, 2012*

**Math**

2 / x = 3 * 2 / 3 x = 6 / 3 x 5 / 3 x + 2 / x = 5 / 3 x + 6 / 3 x = 11 / 3x Answer is ( C )

*May 4, 2012*

**math**

f ( 0 ) = 3 * 0 ^ 2 - 4 * 0 = 3 * 0 + 0 = 0 + 0 = 0 f ( - 1 ) = 3 * ( - 1 ) ^ 2 - 4 * ( - 1 ) = 3 * 1 + 4 = 3 + 4 = 7 f ( 2 ) = 3 * 2 ^ 2 - 4 * 2 = 3 * 4 - 4 * 2 = 12 - 8 = 4

*May 4, 2012*

**Calculus**

second derivative is derivative of first derivative on wolframalpha dot com type : derivative 4 ( x - 3 ) / [ 2 x ^ 2 - 12 x + ( y -10 ) y ] and click option = then Show steps

*May 4, 2012*

**Calculus**

Go on: wolframalpha dot com When page be open in rectangle type: derivative ln (2X^2 - 12X + Y^2 -10Y) and click option = After a few seconds , when you see result click option: Show steps

*May 4, 2012*

**algebra**

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

*May 4, 2012*

**algebra**

( - 7 x ^ 2 + 5 x - 9 ) - ( 2 x ^ 2 + 7 x + 5 ) = - 7 x ^ 2 - 2 x ^ 2 + 5 x - 7 x - 9 - 5 = - 9 x ^ 2 - 2 x - 14

*May 3, 2012*

**math**

sqrt ( x ^ 5 ) = ( x ^ 5 ) ^ ( 1 / 2 ) = x ^ ( 5 / 2 ) sqrt ( x ^ 2 ) = x = x ^ 1 = x ^ ( 2 / 2 ) 1 / sqrt ( x ^ 2 ) = x ^ ( - 2 / 2 ) sqrt ( x ^ 5 ) / sqrt ( x ^ 2 ) = sqrt ( x ^ 5 ) * 1 / sqrt ( x ^ 2 ) x ^ a * x ^ b = x ^ ( a + b ) x ^ ( 5 / 2 ) * x ^ ( - 2 / 2 ) = x ^ [ 5...

*May 3, 2012*

**help plz math**

ln ( a ) - ln ( b ) = ln ( a / b ) ln ( 3 x + 5 ) - ln ( 4 ) = ln [ ( 3 x + 5 ) / 4 ] ln ( 3 x + 5 )- ln ( 4 ) = ln [ ( 3 x + 5 ) / 4 ] = ln ( x + 1 ) Cancel logarithms by taking exp of both sides ( 3 x + 5 ) / 4 = x - 1 Multiply both sides by 4 3 x + 5 = 4 * ( x - 1 ) 3 x + 5...

*May 3, 2012*

**Math**

18 x ^ 5 + 3 x ^ 3 + 6 x = 3 x ( 6 x ^ 4 + x ^ 2 + 2 ) ( 18 x ^ 5 + 3 x ^ 3 + 6 x ) / 3 x = 3 x ( 6 x ^ 4 + x ^ 2 + 2 ) / 3 x = ( 3 x / 3 x ) ( 6 x ^ 4 + x ^ 2 + 2 ) = 1 * ( 6 x ^ 4 + x ^ 2 + 2 ) = 6 x ^ 4 + x ^ 2 + 2

*May 2, 2012*

**Math**

( 4 x ^ 2 - 5 x + 7 ) + ( x ^ 2 - 3 x - 6 ) = 4 x ^ 2 + x ^ 2 - 5 x - 3 x + 7 - 6 = 5 x ^ 2 - 8 x + 1

*May 2, 2012*

**Math**

a ) ( 2 x + 5 )( 2 x - 5 ) = 2 x * 2 x + 2 x * 5 - 5 * 2 x - 5 * 5 = 4 x ^ 2 + 10 x - 10 x - 25 = 4 x ^ 2 - 25

*May 2, 2012*

**Math**

x ^ 2 - 7 x y + 2 - ( 2 x ^ 2 + 3 x y - 6 ) = x ^ 2 - 2 x ^ 2 - 7 x y - 3 x y + 2 - ( - 6 ) = - x ^ 2 - 10 x y + 2 + 6 = - x ^ 2 - 10 x y + 8

*May 2, 2012*

**Calculus**

Go on: wolframalpha dot com When page be open in rectangle type: integrate square root (x)+e^-3x dx and click option = When you see result click option: Show steps

*May 1, 2012*

**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*