Monday

October 24, 2016
Total # Posts: 2,239

**Math**

24 / 12 = 2 2 24/12 = 2 + 24 / 12 = 2 + 2 = 4

*November 5, 2012*

**Math**

14 / 30 = 2 * 7 / ( 2 * 15 ) = 7 / 15

*November 2, 2012*

**Math**

Correction: In this case : m = 6 / 7 b = - 5

*October 31, 2012*

**Math**

y = m x + b This is called the slope-intercept form because "m" is the slope and "b" gives the y-intercept. In this case : b = 6 / 7 m = - 5 y = m x + b y = ( 6 / 7 ) x + ( - 5 ) y = ( 6 / 7 ) x - 5 Multiply both sides by 7 7 y = 6 x - 35 Subtract 6 x to ...

*October 31, 2012*

**Math for Steve**

14. 24 / 20 = 2 * 2 * 2 * 3 / ( 2 * 2 * 5 ) = 2 * 3 / 5 = 6 / 5

*October 30, 2012*

**calculus**

( x ^ 2 - 4 ) / ( x - 2 ) = ( x + 2 ) * ( x - 2 ) / ( x - 2 ) = x + 2 lim ( x ^ 2 - 4 ) / ( x - 2 ) as x->2 = lim ( x + 2 ) as x->2 = 2 + 2 = 4 ( x + 1 )/ ( x - 1 ) = 2 / ( x - 1 ) + 1 lim ( x + 1 )/ ( x - 1 ) as x->1 = lim [ 2 / ( x - 1 ) + 1 ] as x->1 = + OR - ...

*October 27, 2012*

**math**

In google type : quadratic equation calculator steps When you see list of results click on : algebra . com / algebra / homework / quadratic / When page be open type your equation and click option : Submit Query You will see solution

*October 26, 2012*

**algebra**

4 < 1 + n /7 Multiply both sides by 7 28 < 7 + n Subtract 7 to both sides 28 - 7 < 7 + n - 7 21 < n This is equivalent of : n > 21

*October 25, 2012*

**math**

16 x - y = 8 Add y to both sides 16 x - y + y = 8 + y 16 x = 8 + y Subtract 8 to both sides 16 x - 8 = 8 + y - 8 16 x - 8 = y y = 16 x - 8

*October 25, 2012*

**math**

324 = 3 * 108 324 * 4 = 3 * ( 108 * 4 )

*October 24, 2012*

**math**

1 1 / 4 = 1.25 6 2 / 8 = 6 1 / 4 = 6.25 1 * 6.25 / 1.25 = 1 * 5 = 5 signs

*October 24, 2012*

**prealgebra**

1 km = 1,000 m 1 min = 60 s 0.85 km / s = 0.85 * 1,000 * 60 = 850 * 60 = 51,000 m / min

*October 22, 2012*

**math**

1 bilion = 1,000 * 1,000,000 1 milon = 1,000 * 1,000 1 bilion = 1,000 * 1,000 * 1,000 = 1,000 ^ 3 1,000 = 10 ^ 3 1 bilion = ( 10 ^ 3 ) ^ 3 = 10 ^ 9 10 = 2 * 5 1 bilion = ( 2 * 5 ) ^ 9 = 2 ^ 9 * 5 ^ 9

*October 22, 2012*

**math**

L = Length B = Breadth P = Perimeter P = 2 L + 2 B = 2 ( L + B ) 26 = 2 ( L + B ) Divide both sides by 2 26 / 2 = 2 ( L + B ) / 2 13 = L + B Substract L to both sides 13 - L = L + B - L 13 - L = B B = 13 - L 1.) L = 1 cm B = 13 - 1 = 12 cm 2.) L = 2 cm B = 13 - 2 = 11 cm 3.) L...

*October 21, 2012*

**maths**

H = Height 3 m + 2 m = 5 m Proportion : H / 2 = 6.1 / 5 Multiply both sides by 2 H = 6.1 * 2 / 5 = 12.2 / 5 = 2.44 m

*October 21, 2012*

**Trigonometry**

cos ( 2 x ) = 2 cos ^ 2 ( x ) - 1 6 cos ^ 2 ( x ) - 3 = 3 [ 2 cos ^ 2 ( x ) - 1 ] = 3 sin ( 2 x )

*October 21, 2012*

**Math**

y - intercept for x = 0 y = 3 * 0 + 2 = 0 + 2 = 2 x - intercept 3 x + 2 = 0 3 x = - 2 x = - 2 / 3 Plot coordinate system. Them mark points : x = 0 ; y = 2 and x = - 2 / 3 ; y = 0 Then drawe straight line.

*October 13, 2012*

**pre-cal**

d = sqrt [ ( x2 - x1 ) ^ 2 + ( y2 - y1 ) ^ 2 ] In this case : x1 = - 1 y1 = 1 x2 = 1 y2 = 2 d = sqrt [ ( 1 - ( - 1 ) ) ^ 2 + ( 2 - 1 ) ^ 2 ] d = sqrt [ ( 1 + 1 ) ) ^ 2 + 1 ^ 2 ] d = sqrt [ 2 ^ 2 + 1 ] d = sqrt ( 4 + 1 ) d = sqrt ( 5 )

*October 12, 2012*

**algebra**

What is your question?

*October 7, 2012*

**math**

7.185 * 10 ^ 2

*October 6, 2012*

**math**

84.5 < 90 Decrese [ 1 - ( 84.5 / 90 ) ] * 100 % = ( 1 - 0.938888 ... ) * 100 % = 0.061111 ... * 100 % = 6.1111 %

*October 5, 2012*

**maths magic**

9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 45 Write 45 like : 987654321 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45 Write 45 like : 123456789 987654321 - 123456789 = 864197532 8 + 6 + 4 + 1 + 9 + 7 + 5 + 3 + 2 = 45 987654321 [ 45 ] - 123456789 [ 45 ] = 864197532 [ 45 ]

*October 5, 2012*

**college algebra**

x ^ 6 - 64 = 0 Add 64 to both sides x ^ 6 - 64 + 64 = 0 + 64 x ^ 6 = 64 x = sixth root of 64 x = + OR - 2 Solutions : x = - 2 and x = 2

*October 5, 2012*

**Precalc**

x ^ 2 - x y + 2 x - 1 = 0 Add xy to both sides x ^ 2 - x y + 2 x - 1 + x y = 0 + x y x ^ 2 + 2 x - 1 = x y Roots : When y = 0 then : x ^ 2 + 2 x - 1 = x * 0 x ^ 2 + 2 x - 1 = 0 Add 2 to both sides x ^ 2 + 2 x - 1 + 2 = 0 + 2 x ^ 2 + 2 x + 1 = 2 ...

*October 4, 2012*

**math**

1 basket : 12 a + b = 3105 Subtract 12 a to both sides 12 a + b - 12 a = 3105 - 12 a b = 3105 - 12 a

*October 4, 2012*

**math**

a = mass of one aple b = mass of basket 1 basket : 12 a + b = 3105 Subtract 12 a to both sides 12 a + b - 12 b = 3105 - 12 a b = 3105 - 12 a 2 basket : 7 a + b = 1980 7 a + 3105 - 12 a = 1980 - 5 a + 3105 = 1980 Subtract 3105 to both sides - 5 a + 3105 - 3105 = 1980 - 3105 - 5...

*October 4, 2012*

**precalc**

( a + b ) ^ 3 = a ^ 3 + 3 a ^ 2 b + 3 a b ^ 2 + b ^ 3 ( x + 2 ) ^ 3 = x ^ 3 + 3 x ^ 2 * 2 + 3 x * 2 ^ 2 + 2 ^ 3 = x ^ 3 + 3 x ^ 2 * 2 + 3 x * 4 + 8 = x ^ 3 + 6 x ^ 2 + 12 x + 8 - 3 x ^ 2 * ( x ^ 3 + 6 x ^ 2 + 12 x ) = - 3 x ^ 5 - 18 x ^ 4 - 36 x ^ 3 the degree of a polynomial...

*October 4, 2012*

**ALG2!**

- 3 k - 8 < = 5 k Subtract 5 k to both sides - 3 k - 8 - 5 k < = 5 k - 5 k - 8 k - 8 < = 0 Add 8 to both sides - 8 k - 8 + 8 < = 0 + 8 - 8 k < = 8 Divide both sides by - 8 ________________________________________ Remark : If you multiply or divide both sides of ...

*October 4, 2012*

**math**

J = Jim age C = Carol age J = 45 J = 10 + 5 C 45 = 10 + 5 C Subtract 10 to both sides 45 - 10 = 10 + 5 C - 10 35 = 5 C Divide both sides by 5 35 / 5 = C 7 = C C = 7 Carol is 7 yo Proof : 5 * 7 + 10 = 35 + 10 = 45

*October 3, 2012*

**PRECALC**

2 sin 4 x = 1 Divide both sides by 2 sin 4 x = 1 / 2 Take the inverse sine of both sides : 4 x = sin ^ - 1 ( 1 / 2 ) ________________________________________ Remark : sin ^ - 1 ( 1 / 2 ) = pi / 6 + 2 pi n OR 5 pi / 6 + 2 pi n Where n is an integer ...

*October 3, 2012*

**Algebra**

-107

*October 1, 2012*

**math**

6 d - 3 d + 2 d = 35 5 d = 35 Divide both sides by 5 d = 7

*September 26, 2012*

**Calculus**

ln ( x ^ 4 ) = 4 * ln ( x ) ln ( x ^ 2 ) = 2 * ln ( x ) ln ( x ^ 4 ) - ln ( x ^ 2 ) = 2 4 * ln ( x ) - 2 * ln ( x ) = 2 2 * ln ( x ) = 2 Divide both sides by 2 ln ( x ) = 1 Cancel logarithm by taking exp of both sidess x = e = 2.71828...

*September 24, 2012*

**Geometry**

Two Angles are Complementary if they add up to 90 ° In this case : 16 z - 9 ° + 4 z + 3 ° = 90 ° 20 z - 6 ° = 90 ° Add 6 ° to both sides 20 z - 6 ° + 6 ° = 90 ° + 6 ° 20 z = 96 ° Divide both sides by 20 z = 96 ° / 20 = 4.8 &...

*September 17, 2012*

**Algebra2**

1. 5 x - y = 10 5 x - 10 = y y = 5 x - 10 2. x ^ 2 + y ^ 2 = 4 y ^ 2 = 4 - x ^ 2 y = + OR - sqrt ( 4 - x ^ 2 )

*September 17, 2012*

**Algebra 2**

Go on : wolframalpha dot com When page be open in rectangle type : solve x-3x^1/2+2=0 an click option : = When you seeresults click option : Show steps

*September 17, 2012*

**Algebra 2**

Go on : wolframalpha dot com When page be open in rectangle type : solve 6X^(2/3)-5X^(1/3)-6=0 an click option : = When you seeresults click option : Show steps

*September 17, 2012*

**Arithmetic Progression**

Arithmetic progression : an = a1 + ( n - 1 ) * d In this case : a6 = a1 + ( 6 - 1 ) * d a6 = a1 + 5 d a4 = a1 + ( 4 - 1 ) *d a4 = a1 + 3 d a6 = ( 1 / 2 ) a4 a6 = ( 1 / 2 ) ( a1 + 3 d ) a6 = a1 / 2 + 3 d / 2 a6 = a6 a1 + 5 d = a1 / 2 + 3 d / 2 Substract 5 d to both sides a1 + 5...

*September 17, 2012*

**algebra**

2 ( 5 + k ) = 10 + 2 k

*September 17, 2012*

**Algebra**

Sorry last row : = ( 3 a ^ 2 b - 4 a b ^ 2 + 2 b ^ 4 ) / 2 a

*September 17, 2012*

**Algebra**

( 9 a ^ 3 b ^ 4 - 12 a ^ 2 b ^ 5 + 6 a b ^ 7) / ( 6 a ^ 2 b ^3 ) = 3 * a * b ^ 3 * ( 3 a ^ 2 * b - 4 a * b ^ 2 + 2 b ^ 4 ) / [ 3 * a * b ^ 3 * ( 2 a ) ] = ( 3 a ^ 2 b - 4 a b ^ 2 + 2 b ^ 4 ) / 20

*September 17, 2012*

**algebra**

4 / 5 = 0.8 square root of 1.3 = 1.140175425 4 / 5 < square root of 1.3 pie =3.14156 19 / 6 = 3.166666... pie < 19 / 6

*September 17, 2012*

**math**

h / ( 1 / k ) = ( h / 1 ) / ( 1 / k ) = h * k / ( 1 * 1 ) = h * k / 1 = h * k

*September 17, 2012*

**math**

12 / 8 = 18 / x Multiply both sides by 8 12 = 18 * 8 / x 12 = 144 / x Multiply both sides by x 12 * x = 144 Divide both sides by 12 x = 144 / 12 = 12 $

*September 14, 2012*

**Calculus**

Go on : wolframalpha dot com When page be open in rectangle type : limit (x/(1+sqrtx) - 81/10) / (x-81) as x-> 81 When you see result click option : Show steps

*September 14, 2012*

**Algebra..**

The standard form equation of a circle: ( x - h ) ^ 2 + ( y - k ) ^ 2 = r ^ 2 h are the x coordinate of the center of the circle. k are the y coordinate of the center of the circle. r = radius In this case: h = - 2 k = 0 r = 3 So equation of a circle : ( x + 2 ) ^ 2 + y ^ 2 = 9

*September 14, 2012*

**ALGEBRA**

10 x + 75 = 150 Substract 75 to both sides 10 x + 75 - 75 = 150 - 75 10 x = 75 Divide both sides by 10 x = 75 / 10 = 7.5

*September 13, 2012*

**Calc**

The limit of a quotient is the quotient of the limits. limit ( e ^ x ) / x as x -> 0 = [ limit ( e ^ x ) as x -> 0 ] / [ limit x as x -> 0 ] = 1 / 0 which is undefined. limit ( e ^ x ) / x as x -> 0 = + OR - infinity OR limit ( e ^ x ) / x as x -> 0- = - ...

*September 13, 2012*

**arithmetic**

56 + 1 / 4 = 4 * 56 / 4 + 1 / 4 = 224 + 1 / 4 = 225 / 4 liter 225 / 4 * ( 8 / 15 ) = 8 * 225 / ( 4 * 15 ) = 1800 / 60 = 30 litres

*September 13, 2012*

**algebra**

L = Length W = Width A = Area L = W + 5 A = W * L 84 = W * ( W + 5 ) 84 = W ^ 2 + 5 W W ^ 2 + 5 W = 84 Add 25 / 4 to both sides W ^ 2 + 5 W + 25 / 4 = 84 + 25 / 4 W ^ 2 + 5 W + 25 / 4 = 336 / 4 + 25 / 4 W ^ 2 + 5 W + 25 / 4 = 361 / 4 ( W + 5 / 2 ) ^ 2 = 361 / 4 ...

*September 13, 2012*

**maths**

Sorry. 10 / 0.4 = 100 / 4 = 25

*September 13, 2012*

**maths**

1 kg = 1,000 g 10 kg = 10,000 g 10,000 / 400 = 25 OR 400 g = 0.4 kg 10 / 0.4 = 100 / 40 = 25

*September 13, 2012*

**calculus maths**

log base 2 ( x ) = log ( x ) / log ( 2 ) y = ln log base 2 ( x ) = ln [ log ( x ) / log ( 2 ) ]

*September 13, 2012*

**math**

x + 6 = 18 Substract 6 to both sides x + 6 - 6 = 18 - 6 x = 12

*September 13, 2012*

**College Algebra**

The standard form equation of a circle : ( x - h ) ^ 2 + ( y - k ) ^ 2 = r ^ 2 h are the x coordinates of the center of the circle k are the y coordinates of the center of the circle r = radius In this case: x coordinate of the center = 2 y coordinate of the center = 4 r = ...

*September 13, 2012*

**Algebra**

- 25 = - 1 * 25 sqrt ( - 25 ) = sqrt ( - 1 ) * sqrt ( 25 ) = i * 5 = 5 i ________________________________________ Remark : i = sqrt ( - 1 ) = Imaginary Unit ________________________________________

*September 13, 2012*

**math**

( 3.845 * 10 ^ - 4 ) * ( 3.67 * 10 ^ 6 ) = 3.845 * 3.67 * 10 ^ - 4 * 10 ^ 6 = 14.11115 * 10 ^ 2 = 1.411115 * 10 * 10 ^ 2 = 1.411115 * 10 ^ 3 approx. 1.411 * 10 ^ 3

*September 12, 2012*

**Geometry-area**

A = d ^ 2 pi / 4 If d = 16 ft then : A = 16 ^ 2 pi / 4 = 256 pi / 4 = 64 pi ft ^ 2

*September 12, 2012*

**math - alegbra 1**

(5 c - 9 ) * ( 5 c + 1 ) = 5 c * 5 c - 5 c * 9 + 1 * 5 c - 1 * 9 = 25 c ^ 2 - 45 c + 5 c - 9 = 25 c ^ 2 - 40 c - 9

*September 12, 2012*

**Limit Calculas**

Go on : wolframalpha dot com When page be open in rectangle type: limit sin(2y)/tan(5y) as y->4 and click option = When you see result click option : Show steps

*September 12, 2012*

**Pre-Cal**

The domain of a function is the set of all possible input values, which allows the function formula to work. In this case when x ^2 > 9 then x ^ 2 -9 < 0 Square root negative numbers are complex numbers. So domain of your function : x ¡ 2 > 9 x > + OR - 3 ...

*September 12, 2012*

**math**

C = 2 * r * pi 1 case : 18 * pi = 2 * r * pi Divide both sides by ( 2 * pi ) 18 * pi / ( 2 * pi ) = 2 * r * pi / ( 2 * pi ) 9 = r r = 9 cm 2 case : 16 * pi = 2 * r * pi Divide both sides by ( 2 * pi ) 16 * pi / ( 2 * pi ) = 2 * r * pi / ( 2 * pi ) 8 = r r = 8 cm 9 - 8 = 1 cm

*September 12, 2012*

**Math**

2 ( b + 1 ) < - 6 Divide both sides by 2 b + 1 < - 3 Subtract 1 to both sides b + 1 - 1 < - 3 - 1 b < - 4 Answer: a

*September 10, 2012*

**math**

yes 16 + 3 = 19 9 * 2 = 18

*September 9, 2012*

**math**

8.875 * 10 ^ - 5 = 0.00008875 If 5 / 3.65 * 10 ^ 3 mean 5 / ( 3.65 * 10 ^ 3 ) then 5 / ( 3.65 * 10 ^ 3 ) = 5 / 3.65 * 1000 ) = 5 / 3650 = 0.001369863 8.875 * 10 ^ - 5 - 5 / ( 3.65 * 10 ^ 3 ) = 0.00008875 - 0.001369863 = -0,001281113 = - 1.281113 * 10 ^ - 3

*September 9, 2012*

**math**

8.897 * 10 ^ 6 / 3.2 * 10 ^ 4 = ( 8.897 / 3.2 ) * 10 ^ 6 / 10 ^ 4 = ( 8.897 / 3.2 ) * 10 ^ 2 = 2.7803125 * 10 ^ 2

*September 9, 2012*

**math-algebra**

64 = 4 ^ 3 64 x ^ 3 = ( 4 x ) ^ 3 27 = 3 ^ 3 64 x ^ 3 - 27 = ( 4 x ) ^ 3 - 3 ^ 3 a ^ 3 - b ^ 3 = ( a - b ) ( a ^ 2 + a b + b ^ 2 ) In this case: 64 x ^ 3 - 27 = ( 4 x ) ^ 3 - 3 ^ 3 = ( 4 x - 3 ) * [ ( 4 x ) ^ 2 + 4 x * 3 + 3 ^ 2 ] = ( 4 x - 3 ) * ( 16 x ^ 2 + 12 x + 9 )

*September 9, 2012*

**algr.1**

If your expression mean : ( 1 / 4 ) n + 12 > ( 3 / 4 ) n - 4 then: ( 1 / 4 ) n + 12 > ( 3 / 4 ) n - 4 Multiply both sides by 4 4 * ( 1 / 4 ) n + 4 * 12 > 4 * ( 3 / 4 ) n - 4 * 4 n + 48 > 3 n - 16 Substrac n to both sides n + 48 - n > 3 n - 16 - n 48 > 2 n - ...

*September 9, 2012*

**math**

302.50 / 5 = 60.5

*September 9, 2012*

**algebra**

One correction in second line . P > 134 ft

*September 9, 2012*

**algebra**

W = 29 ft P = 134 ft P = 2 L + 2 W = 2 ( L + W ) P > 134 ft 2 ( L + 29 ) > 134 2 L + 58 > 134 Substract 58 to both sides 2 L + 58 - 58 > 134 - 58 2 L > 76 Divide both sides by 2 L > 38 ft

*September 9, 2012*

**Math- URGENT PLEASE**

9.3 * 10 ^ 3 = 9.3 * 1,000 = 9,300 9.3 * 10 ^ 4 = 9.3 * 10,000 = 93,000 0.011 * 10 ^ 6 = 0.011 * 1,000,000 = 11,000 9.3 * 10 ^ 3 + 9.3 * 10 ^ 4 + 0.011 * 10 ^ 6 = 9,300 + 93,000 + 11,000 = 113,300 = 1.133 * 10 ^ 5

*September 9, 2012*

**Trigonometry**

First answer is wrong.

*September 8, 2012*

**Trigonometry**

•Trigonometry - Bosnian, Sunday, September 9, 2012 at 1:07am Area of right triangle = 1 / 2 Area of a rectangle In this case: A1 = ( 1 / 2 ) * 8 * 15 = 60 units When each side is doubled: A2 = ( 1 / 2 ) * 2 * 8 * 2 * 15 = 4 * ( 1 / 2 ) * 8 * 15 = 4 A1 A2 = 4 * 60 = 240 ...

*September 8, 2012*

**Trigonometry**

Area of right triangle = 1 / 2 Area of a rectangle In this case: A1 = ( 1 / 2 ) * 8 * 15 = 20 units When each side is doubled: A2 = ( 1 / 2 ) * 2 * 8 * 2 * 15 = 4 * ( 1 / 2 ) * 8 * 15 = 4 A1 A2 = 4 * 20 = 80 units

*September 8, 2012*

**Trigonometry**

sin theta = H / L = H / 5 H = 5 * sin theta = 5 * sin 50 ° 32 ´ H = 5 * 0.77199 H = 3.85995 m approx. H = 3.86 m

*September 8, 2012*

**Trigonometry**

The rule of Pythagoras: c ^ 2 = a ^ 12 + b ^ 2 In this case : c = 34 cm b = a + 14 c = a ^ 2 + ( a + 14 ) ^ 2 34 ^ 2 = a ^ 2 + ( a + 14 ) ^ 2 1156 = a ^ 2 + a ^ 2 + 2 * a * 14 + 14 ^ 2 1156 = 2 a ^ 2 + 28 a + 196 Subtract 196 to both sides 1156 - 196 = 2 a ^ 2 + 28 a + 196 - ...

*September 8, 2012*

**Precalculus**

an = n ^ 2 + 1 n = 1 a1 = 1 ^ 2 + 1 = 1 + 1 = 2 n = 2 a2 = 2 ^ 2 + 1 = 4 + 1 = 5 n = 3 a3 = 3 ^ 2 + 1 = 9 + 1 = 10 n = 4 a4 = 4 ^ 2 + 1 = 16 + 1 = 17

*September 8, 2012*

**Cal-Help Please**

When x = 9 9 x − x ^ 2 = 9 * 9 - 9 ^ 2 = 81 - 81 = 0 and 3 - sqt( x ) / ( 9 x − x ^ 2 ) = 3 - sqt( 9 ) / ( 9 x − x ^ 2 ) = 3 - 3 / 0 = 3 - ( + OR - infinity ) So: limit 3 − square root( x ) /(9 x − x ^ 2 ) as x ->9 = + OR - infinity

*September 8, 2012*

**geometry**

Two Angles are complementary if they add up to 90 ° (a Right Angle). Or : A + B = 90 ° In this case : A = 16 z - 9 ° B = 4 z + 3 ° A + B = 90 ° 16 z - 9 ° + 4 z + 3 ° = 90 ° 20 z - 6 ° = 90 ° Add 6 ° to both sides 20 z - 6 ° + 6...

*September 8, 2012*

**Math**

3 x + 2 y = 3 subtract 3 x to both sides 3 x - 3 x + 2 y = 3 - 3 x 2 y = 3 - 3 x Divide both sides by 2 y = 3 / 2 - 3 x / 2 2 x + 10 y = - 5 Subtract 2 x to both sides 2 x - 2 x + 10 y = - 5 - 2 x 10 y = - 5 - 2 x Divide both sides by 10 y = - 5 / 10 - 2 x / 10 y = y 3 / 2 - 3...

*September 8, 2012*

**Algebra....HELP!!**

7 a + 6 b = 3 + -7 a + b = 25 ________________ 7 a + ( - 7 a ) + 6 b + b = 3 + 25 7 b = 28 Divide both sides by 7 7 b / 7 = 28 / 7 b = 4 7 a + 6 b = 3 7 a + 6 * 4 = 3 7 a + 24 = 3 Subtract 24 to both sides 7 a + 24 - 24 = 3 - 24 7 a = - 21 Divide both sides by 7 7 a / 7 = - ...

*September 7, 2012*

**Math**

If your expresion mean : ( - 4 ) * ( - x ) ^ 3 * x * ( - 1 / 8 ) then : ( - 4 ) * ( - x ) ^ 3 * x * ( - 1 / 8 ) = - 4 * ( - 1 / 8 ) * ( - x ^ 4 ) = ( 1 / 2 ) * ( - x ^ 4 ) = - x ^ 4 / 2

*September 6, 2012*

**math**

If your expression mean : [ ( 2 ^ 5 - 5 ) / 9 ] * 11 then : 2 ^ 5 = 2 * 2 * 2 * 2 * 2 = 32 2 ^ 5 - 5 = 32 - 5 = 27 ( 2 ^ 5 - 5 ) / 9 = 27 / 9 = 3 [ ( 2 ^ 5 - 5 ) / 9 ] * 11 = 3 * 11 = 33

*September 5, 2012*

**calculus**

5 = 1 + 4 6 = 2 + 4 7 = 3 + 4 ... 14 = 10 + 4 5 ^ 2 + 6 ^ 2 + 7 ^ 2 + ... + 14 ^ 2 = ( 1 + 4 ) ^ 2 + ( 2 + 4 ) ^ 2 + ( 3 + 4 ) ^ 2 + ... + ( 10 + 4 )^ 2 = E ( k + 4 ) ^ 2 from n = 1 to n = 10 ________________________________________ ( k + 4 ) ^ 2 = k ^ + 2 * k * 4 + 4 ^ 2 = k...

*September 5, 2012*

**Math**

x ^ 2 + y ^ 2 + 6 x - 46 = 0 x ^ 2 + y ^ 2 + 6 x = 46 ( x ^ 2 + 6 x + 9 ) + y ^ 2 = 46 + 9 ( x + 3 ) ^ 2 + y ^ 2 = 55 The circle equation is: (x - a ) ^ 2 + ( y - b ) ^ 2 = r ^ 2 where a and b are the x and y coordinates of the center of the circle. In this case : a = - 3 ...

*September 4, 2012*

**calculus**

Where is your graph?

*September 1, 2012*

**math**

If log 7 mean logarithm to base b = 7 then : log 7 ( x ) = log 7 ( 4 ) + log 7 ( 3 ) log ( a ) + log ( b ) = log ( a * b ) log 7 ( 4 ) + log 7 ( 3 ) = log 7 ( 4 * 3 ) = log 7 ( 12 ) log 7 ( x ) = log 7 ( 12 ) x = 12

*September 1, 2012*

**Math**

A = sqrt [ s * ( s - a ) * ( s - b ) * ( s - c ) ]

*August 31, 2012*

**Math**

The semiperimeter of a triangle is half its perimeter. The formula for the semiperimeter of a triangle with side lengths a, b, and c is: s = ( a + b + c ) / 2 The area of a triangle can also be calculated from its semiperimeter using Heron's formula: A = [ sqrt s * ( s - a...

*August 31, 2012*

**Pre-algebra**

2 + 0.35 * 12 = 2 + 4.2 = 6.2

*August 31, 2012*

**MATH**

16 - 30 / ( 10 + 5 ) = 16 - 30 / 15 = 16 - 2 = 14

*August 27, 2012*

**geometry**

180 ° - x = 3 * ( 90 ° - x ) - 60 ° 180 ° - x = 270 ° - 3 x - 60 ° 180 ° - x = 210 ° - 3 x - x + 3 x = 210 ° - 180 ° 2 x = 30 ° Divide both sides by 2 x = 15 °

*August 25, 2012*

**math**

16 ^ 2 = 256 25 / 5 = 5 If 6(3)4 mean 6 * 3 * 4 then . 16^2-25/5+6(3)4= 256 - 5 + 72 = 323

*August 25, 2012*

**math**

Go on: wolframalpha dot com When page be open in rectangle type: derivative ln(cos(0.5)+(sin(x^2+3))^1/3) and click option = After few seconds when you see result click option: Show steps On wolfram alpha dot com you can practice any kind of calculus. That is good just for ...

*August 25, 2012*

**Algebra**

When p = 0 1 / p -> Infinity One solution also p < 0 becouse when p < 0 then 1 / 6 p are negative and 1 / 6 p + 14 < 20 So the exact solutions are : p < 0 and p > 1 / 36

*August 24, 2012*

**Algebra**

1 / ( 6 p ) + 14 < 20 Subtract 14 to both sides 1 / ( 6 p ) + 14 - 14 < 20 - 14 1 / ( 6 p ) < 6 Multiply both sides by 6p 6 p * 1 / ( 6 p ) < 6 p * 6 1 < 36 p Divide both sides by 36 1 /36 < 36 p / 36 1 / 36 < p that is equivalent of p > 1 / 36

*August 24, 2012*

**math**

P = 2 a + 2 b In your case : a = x , b = 2 x + 3 P = 2 a + 2 b = 72 P = 2 x + 2 * ( 2 x + 3 ) = 72 2 x + 4 x + 6 = 72 6x + 6 = 72 Subtract 6 to both sides 6 x + 6 - 6 = 72 - 6 6 x = 66 Divide both sides by 6 x =11 x = a = 11 cm b = 2 x + 3 b = 2 * 11 + 3 = 22 + 3 = 25 cm P = 2...

*August 24, 2012*

**Algebra**

1 p = p 1 p + 14 < 20 p + 14 < 20 Subtracrt 14 to both sides p + 14 - 14 < 20 - 14 p < 6

*August 24, 2012*