Tuesday

January 24, 2017
Total # Posts: 2,320

**math**

Through n +1 points passing polynomial of degree n. In this case you have 7 points. Polynomial will be degree 6. Write the polynomial in this form : a * x ^ 6 + b * x ^ 5 + c * x ^ 4 + d * x ^ 3 + e * x ^ 2 + f *x + g = y Now put values of x an y in this equation. a * ( - 3...

*July 5, 2013*

**math**

( 16 * 12 ) / ( 4 * 8 ) = 192 / 32 = 6

*July 3, 2013*

**trigonmetry**

tan theta = sin theta / cos theta cot theta = cos theta / sin theta cot heta * sin theta - tan theta * cos theta = ( cos theta / sin theta ) * sin theta - ( sin theta / cos theta ) * cos theta = cos theta - sin thets

*July 3, 2013*

**Math**

dam = dekametre 1 dam = 10 m 315 / 10 = 31.5 315 m = 31.5 dam

*July 2, 2013*

**Math**

967 x ^ 3 + 567 x ^ 9 = x ^ 3 ( 967 + 576 x ^ 6 )

*June 28, 2013*

**maths**

1 min = 60 sec 1 sec = 1 / 60 min 360° / min = 360 ° / 60 = 6 ° / sec 1 rad = 180 ° / pi 1 ° = pi / 180 rad 6 ° * pi / 180 = pi / 30 rad / sec

*June 28, 2013*

**Maths**

In google type : History of numbers

*June 27, 2013*

**Maths**

In google type : History of pie

*June 27, 2013*

**Math**

x = first number y = second number y = x + 1 x * y = 272 x * ( x + 1 ) = 272 x ^ 2 + x = 272 x ^ 2 + x - 272 = 0 Solutions : x = - 17 and x = 16 For x = - 17 y = x + 1 = - 17 + 1 = - 16 x * y = - 17 * ( - 16 ) = 272 For x = 16 y = x + 1 = 16 + 1 = 17 x * y = 16 * 17 = 272 So ...

*June 27, 2013*

**trig**

cos A = 1 / 3 sin A = + OR - sqrt ( 1 - cos A ^ 2 ) sin A = + OR - sqrt ( 1 - ( 1 / 3 ) ^ 2 ) sin A = + OR - sqrt ( 1 - 1 / 9 ) sin A = + OR - sqrt ( 9 / 9 - 1 / 9 ) sin A = + OR - sqrt ( 8 / 9 ) sin A = + OR - sqrt ( 4 * 2 / 9 ) sin A = + OR - sqrt ( 4 ) * sqrt ( 2 ) / sqrt...

*June 16, 2013*

**Algebra**

8 * 10 ^ -6

*June 16, 2013*

**Algebra**

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

*June 16, 2013*

**math**

7 / 9 , 7 / 5 , 7 / 3

*June 11, 2013*

**Intermediate algebra, concepts and graphs**

st = Number of students pr = Number of parents pr = 80 - st 2.5 * st + 3.5 * pr = 234 2.5 * st + 3.5 * ( 80 - st ) = 234 2.5 st + 3.5 * 80 - 3.5 St = 234 2.5 st + 280 - 3.5 st = 234 280 - st = 234 Add st to both sides 280 - st + st = 234 + st 280 = 234 + st Subtract 234 to ...

*June 10, 2013*

**maths**

D = Number of Ducks C = Number of Cows D + C = 35 C = 35 - D Duck have 2 legs. Cow have 4 legs All the cows have 74 more legs than all the ducks. This mean : 4 * C = 2 D + 74 4 * ( 35 - D ) = 2 D + 74 4 * 35 - 4 D = 2 D + 74 140 - 4 D = 2 D + 74 Subtract 74 to both sides 140...

*June 10, 2013*

**math**

x / 2 + x / 3 = 5 ( x * 3 + x * 2 ) / ( 2 * 3 ) = 5 5 x / 6 = 5 Multiply both sides by 6 5 x = 5 * 6 5 x = 30 Divide both sides by 6 x = 30 / 5 = 5

*June 9, 2013*

**math**

x / 2 + x / 3 = 5 ( x * 3 + x * 2 ) / ( 2 * 3 ) = 5 5 x / 6 = 5 Multiply both sides by 6 5 x = 5 * 6 5 x = 30 Divide both sides by 5 x = 30 / 5 = 5

*June 9, 2013*

**Math**

7 / 3 a + 2 / 5 = ( 7 * 5 + 2 * 3 a ) / ( 5 * 3 a ) = ( 35 + 6 a ) / 15 a = ( 6 a + 35 ) / 15 a

*June 9, 2013*

**Introduction to Algebra MAT 221**

x ^ 4 = x ^ 3 * x x ^ 4 - x ^ 3 = x ^ 3 * x - x ^ 3 = x ^ 3 ( x - 1 )

*June 6, 2013*

**algerbra**

( 20 + 24 ) / 2 = 44 / 2 = 22

*June 6, 2013*

**Algebra**

( 80 + 90 + 78 + 100 + 76 + 74 + 82 + x ) / 8 = 82 Multiply both sides by 8 80 + 90 + 78 + 100 + 76 + 74 + 82 + x = 82 * 8 580 + x = 656 Subtract 580 to both sides 580 + x - 580 = 656 - 580 x = 76

*June 6, 2013*

**Math**

- 7 ( 3 + 5 x ) = 399 - 7 * 3 - 7 * 5 x = 399 - 21 - 35 x = 399 Add 21 to both sides - 21 - 35 x + 21 = 399 + 21 - 35 x = 420 Divide both sides by - 35 - 35 x / - 35 = 420 / - 35 x = - 12 Proof : - 7 ( 3 + 5 x ) = 399 - 7 [ 3 + 5 * ( - 12 ) ] = 399 - 7 ( 3 - 60 ) = 399 - 7...

*June 4, 2013*

**Math**

4 x - 9 = - 5 x - 99 Add 5 x to both sides 4 x - 9 + 5 x = - 5 x - 99 + 5 x

*June 3, 2013*

**Math**

4 x - 9 = - 5 x - 99 Add 5 x to both sides 4 x - 9 + 5 x = -5 x - 99 + 5 9 x - 9 = - 99 Add 9 to both sides 9 x - 9 + 9 = - 99 + 9 9 x = - 90 Divide both sides by 9 9 x / 9 = - 90 / 9 x = - 10 Proof: 4 x - 9 = - 5 x - 99 4 * ( - 10 ) - 9 = - 5 * ( - 10 ) - 99 - 40 - 9 = 50 - ...

*June 3, 2013*

**Math**

5 - x - x = - 17 5 - 2 x = - 17 Subtract 5 to both sides 5 - 2 x - 5 = - 17 - 5 - 2 x = - 22 Divide both sides by - 2 - 2 x / - 2 = - 22 / - 2 x = 11 Proof : 5 - x - x = 5 - 11 - 11 = 5 - 22 = - 17

*June 3, 2013*

**math**

n = 1 a1 = 3 = 1 * 3 = 1 * ( 2 * 1 + 1 ) = 2 ^ 0 ( 2 n + 1 ) = 2 ^ ( n - 1 ) ( 2 n + 1 ) n = 2 a2 = 10 = 2 * 5 = 2 * ( 2 * 2 + 1 ) = 2 ^ 1 ( 2 n + 1 ) = 2 ^ ( n - 1 ) ( 2 n + 1 ) n = 3 a3 = 28 = 4 * 7 = 4 * ( 2 * 3 + 1 ) = 2 ^ 2 ( 2 n + 1 ) = 2 ^ ( n - 1 ) ( 2 n + 1 ) n = 4 a4...

*June 3, 2013*

**algebra**

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

*June 3, 2013*

**math**

x ^ 2 - 10 x + ( 10 / 2 ) ^ 2 = 9 + ( 10 / 2 ) ^ 2 x ^ 2 - 10 x + 5 ^ 2 = 9 + 5 ^ 2 x ^ 2 - 10 x + 25 = 9 + 25 ( x - 5 ) ^ 2 = 34

*June 3, 2013*

**math**

abs ( 2 - x ) = 3 2 - x = 3 x = 2 - 3 = - 1 - ( 2 - x ) = 3 - 2 + x = 3 x = 3 + 2 = 5

*June 3, 2013*

**math**

Coterminal angles are angles, which share a common terminal side. 820 ° = 2 * 360 ° + 100 ° = 720 ° + 100 ° Coterminal angle = 100 °

*May 29, 2013*

**Algebra**

- 9 - 7 x = - 58 Add 9 to both sides - 9 - 7 x + 9 = - 58 + 9 - 7 x = - 49 Divide both sides by - 7 - 7 x / - 7 = - 49 / - 7 x = 7

*May 29, 2013*

**Math**

1 kg = 1000 g 3 kg = 3000 g 3000 g - 750 g = 2250 g = 2 kg 250 g

*May 29, 2013*

**algebra**

16 = x + 5 16 - 5 = x + 5 - 5 11 = x x = 11

*May 29, 2013*

**maths**

Angles : A , B , C and D ( A + B + C ) / 3 = 64 Multiply both sides by 3 A + B + C = 3 * 64 = 192 ° A / B = 2 / 3 Multiply both sides by 3 3 A / B = 2 Multiply both sides by B 3 A = 2 B Divide both sides by 3 A = 2 B / 3 B / C = 3 / 7 Multiply both sides by 7 7 B / C = 3 ...

*May 28, 2013*

**Math**

The general equation for the function is: f( x ) = a ( x - x1 ) ( x - x2 )( x - x3 ) where x1, x2 and x3 are the roots and a is the coefficient of x ^ 3 There is a theorem in algebra called the Imaginary Zeros Theorem. It says that for a polynomial that is restricted to real ...

*May 24, 2013*

**Math**

300 % = 300 / 100 = 3 3 * 25 = 75 cents

*May 24, 2013*

**college algebra**

35,000 ( 1.10 ) ^ - 12 = 35,000 / ( 1.10 ) ^ 12 = 35,000 / 3.138428376721 = 11,152.07862

*May 23, 2013*

**math**

In google type : square root of 0.31428 from divison method When you see list of results click on : meritnation com /ask.../what.../squares...square-roots/2168377

*May 20, 2013*

**Math**

3 ^ x = 7 x * lgt ( 3 ) = lgt ( 7 ) x = lgt ( 7 ) / lgt ( 3 ) x = 0.845098 / 0.477121 x = 1.771245 lgt is the logarithm with base 10

*May 20, 2013*

**Algebra**

A = Area = 60 in ^ 2 b = base = 10 in h = height A = b h / 2 60 = 10 * h / 2 Multiply both sides by 2 120 = 10 * h Divide both sides by 10 12 = h h = 12 in h = sqrt ( x ) Square both sides h ^ 2 = x x = h ^ 2 = 12 ^ 2 = 144 in ^ 2

*May 20, 2013*

**Math**

50 % = 50 / 100 = 0.5 A team won 0.5 * 60 = 30 games x = the number of games the team must win 60 % = 60 / 100 = 0.6 Proportion : ( 30 + x ) / ( 60 + x ) = 0.6 Multiply both sides by 60 + x 30 + x = ( 60 + x ) * 0.6 30 + x = 36 + 0.6 x Subtract 30 to both sides 30 + x - 30 = ...

*May 15, 2013*

**Math**

100 / 60 = 2 * 5 * 10 / ( 2 * 3 * 10 ) = 5 / 3 = 1.6666666 1.6666 * 100 % = 166.66666 % 166.66666 % - 100 % = 66.66666 % Correct answer.

*May 13, 2013*

**algebra ----**

# 27 - 5 x ( x - 4 ) = - 5 x * x - 5 x * ( - 4 ) = - 5 x ^ 2 + 20 x = 20 x - 5 x ^ 2 # 28 Correct # 29 Correct

*May 13, 2013*

**algebra -**

( 4 m ^ 2 + m - 2 ) + ( - m ^ 2 - 3 m ) = 4 m ^ 2 + m - 2 + ( - m ^ 2 ) + ( - 3 m ) = 4 m ^ 2 + m - 2 - m ^ 2 - 3 m = 4 m ^ 2 - m ^ 2 + m - 3 m - 2 = 3 m ^ 2 - 2 m - 2

*May 13, 2013*

**algebra -**

# 21 3 x ^ 2 ( 2 x - 2 ) = 3 x ^ 2 * 2 x - 3 x ^ 2 * 2 = 6 x ^ 3 - 6 x ^ 2 = 6 x ^ 2 ( x - 1 ) # 22 ( 2 x ^ 2 ) ( 6 x ^ 2 ) = 6 * 2 * x ^ 2 * x ^ 2 = 12 x ^ 4 # 23 ( 4 m ^ 2 + m - 2 ) + ( - m ^ 2 - 3 m ) = 4 m ^ 2 + m - 2 - m ^ 2 - 3 m = 3 m ^ 2 - 2 m - 2 # 25 ( 3 x ^ 2 - x - ...

*May 13, 2013*

**geometry**

100 cm = 1 m d = diameter d = 56 cm = 0.56 m C = Circumference C = d * pi C = 0.56 * 22 / 7 = 12.32 / 7 = 1.76 m 1 km = 1000 m 1000 / 1.76 = 568.181818

*May 13, 2013*

**math**

4 ^ ( x - 1 ) = 4 ^ x / 4 ^ 1 = 4 ^ x / 4 4 ^ x - 4 ^ ( x - 1 ) = 24 4 ^ x - 4 ^ x / 4 = 24 4 * 4 ^ x / 4 - 4 ^ x / 4 = 24 3 * 4 ^ x / 4 = 24 Multiply both sides by 4 3 * 4 ^ x = 96 Divide both sides by 3 4 ^ x = 32 x * log ( 4 ) = log ( 32 ) Divide both sides by log ( 4 ) x...

*May 4, 2013*

**math**

2 ^ x + 2 ^ x + 2 ^ x = 192 3 * 2 ^ x = 192 Divide both sides by 3 3 * 2 ^ x / 3 = 192 / 3 2 ^ x = 64 x = 6 becouse 2 ^ 6 = 64 OR 2 ^ x = 64 x * log ( 2 ) = log ( 64 ) Divide both sides by log ( 2 ) x = log ( 64 ) / log ( 2 ) x = 4.158883 / 0.693147 x = 6 log ( x ) is " ...

*May 4, 2013*

**algebra 1 help**

That is maximum simplified answers.

*May 4, 2013*

**algebra 1 help**

1) V = b w h V = sqrt ( 12 ) * sqrt ( 6 ) * sqrt ( 8 ) = sqrt ( 12 * 6 * 8 ) = sqrt ( 576 ) = 24 " ^ 3 2 ) 576 = 24 * 24 = 24 ^ 2 sqrt ( 576 ) = sqrt ( 24 ^ 2 ) = + OR - 24 3 ) 400 = 20 * 20 = 20 ^ 2 sqrt ( 400 ) = sqrt ( 20 ^ 2 ) = + OR - 20 4 ) 256 = 16 * 16 = 16 ^ 2 ...

*May 4, 2013*

**mathematics**

Go on wolframalpha dot com When page be open in rectangle type : plot f(x)=tanx , g(x)=2cosx, x=0 to 2pi and click option = Graph of g( x ) = 2 cos ( x ) are same graph of cos ( x ) but all values of cos ( x ) are multiply by 2 Remark : 360 ° = 2 pi radians

*May 4, 2013*

**Maths**

A + B + B = 35 A + 2 B = 35 B + B + C = 25 2 B + C = 25 A + B + B + B + C = 55 A + 3 B + C = 55 You have 3 equations : A + 2 B = 35 2 B + C = 25 A + 3 B + C = 55 A + 2 B = 35 Subtract A to both sides A + 2 B - A = 35 - A 2 B = 35 - A 2 B + C = 25 Subtract C to both sides 2 B...

*May 4, 2013*

**math**

6 x - 2 y = 2 Subtract 6 x to both sides 6 x - 2 y - 6 x = 2 - 6 x - 2 y = 2 - 6 x Divide both sides by - 2 - 2 y / - 2 = 2 / - 2 - 6 x / - 2 y = - 1 + 3 x y = 3 x - 1 Equations : y = 3 x - 1 and 6 x - 2 y = 2 are same equation. On interval 0 < = x < = 25 you have 26 ...

*May 4, 2013*

**5th grade Math**

In google type : add fractions with different denominators You wil find many, many sites.

*May 1, 2013*

**math**

6 * 616 / 77 = 3696 / 77 = 48

*May 1, 2013*

**math**

0.04 x - 79.02 = 1.1 Add 79.02 to both sides 0.04 x - 79.02 + 79.02 = 1.1 + 79.02 0.04 x = 80,12 Divide both sides by 0.04 x = 80.12 / 0.04 x = 2003

*May 1, 2013*

**Math**

1 ha = 100 X 100 m 1 ha = 0.1 km X 0.1 km 1 ha = 0.01 km ^ 2 1 km ^ 2 = 1 / 0.01 1 km ^ 2 = 100 ha Area of land = 1.2 * 3.6 = 4.32 km ^ 2 4.32 * 100 = 432 ha 432 * 1,500 = 648,000 $

*April 30, 2013*

**algebra 2**

24 * 30 * 0.73 = 216 $

*April 30, 2013*

**Math**

¡Ù mean : different of f ( ¨C 1 ) = ¨C 9 + 6 + 29 ¨C 10 = 16 ¡Ù 0 mean : f ( - 1 = 16 differen of 0

*April 30, 2013*

**Math**

9 x ^ 3 + 6 x ^ 2 - 29 x - 10 Since the constant in the given equation is a 10 , we know that the integer root must be a factor of 10. The possible values are : + OR - 1 + OR -2 + OR - 5 and + OR - 10 You can use the factor theorem to test the possible values by trial and ...

*April 30, 2013*

**trg**

pi / 12 = 15 ° pi / 12 = 30 ° / 2 sin 30 ° = 1 / 2 cos 30 ° = sqrt ( 3 ) / 2 cot ( theta / 2 ) = ( 1 + cos theta ) / sin theta cot 15 ° = ( 1 + cos 30 ° ) / sin 30 ° cot 15 ° = [ 1 + sqrt ( 3 ) / 2 ] / ( 1 / 2 ) cot 15 ° = 2 * [ 1 + sqrt ( 3...

*April 29, 2013*

**Math**

Go on wolframalpha dot com When page be open in rectangle type : 4 x + 9 = 1234 and lick option =

*April 28, 2013*

**algebra**

45 - 3 y = 15 x Divide both sides by 3 15 - y = 5 x Subtract 15 to both sides - y = 5 x - 15 Multiply both sides by - 1 y = - 5 x + 15 y + 9 = ( 1 / 5 ) x - 5 x + 15 + 9 = x / 5 - 5 x + 24 = x / 5 Subtract x / 5 to both sides - 5 x + 24 - x / 5 = 0 Subtract 24 to both sides - ...

*April 28, 2013*

**math**

( 84 + 65 + 76 + x ) / 4 = 80 84 + 65 + 76 + x = 4 * 80 225 + x = 320 x = 320 - 225 = 95

*April 27, 2013*

**algebra 1 help please**

Average of three quizzes : Av = ( 83 + 91 + n ) / 3 must be equal or greater of 85 and equal or less of 90 85 <= ( 83 + 91 + n ) / 3 <= 90

*April 25, 2013*

**math**

72 * 70 / 100 = 5040 / 100 = 50.4

*April 25, 2013*

**algebra 1 help**

5 ) 12 x - 3 x + 11 < 4 x - ( 17 - 9 x ) 12 x - 3 x + 11 < 4 x - 17 + 9 x 9 x + 11 < 13 x - 17 Subtract 11 to both sides 9 x + 11 - 11 < 13 x - 17 - 11 9 x < 13 x - 28 Subtract 13 x to both sides 9 x - 13 x < 13 x - 28 - 13 x - 4 x < - 28 Divide both sides...

*April 25, 2013*

**Algebra 2.....**

- 3 x ^ 2 ( 6 x y - 2 x ^ 3 y ^ 2 z ) = - 3 x ^ 2 * 6 x y - 3 x ^ 2 ( - 2 x ^ 3 y ^ 2 z ) = - 18 x ^ 3 y + 6 x ^ 5 y ^ 2 z = 6 x ^ 5 y ^ 2 z - 18 x ^ 3 y

*April 24, 2013*

**Math**

7.063329 * 10 ^ 4

*April 23, 2013*

**algebra 1**

b ( b - 1 / 2 )

*April 23, 2013*

**Algebra**

- 2 x + 1 > 7 Subtract 1 to both sides - 2 x + 1 - 1 > 7 - 1 - 2 x > 6 ________________________________________ Remark : When you multiply or divide left and right sides of inequality WITH NEGATIVE NUMBER , you MUST CHANGE the direction of the inequality. ...

*April 20, 2013*

**Inequality Sum**

OR x + y = 201 y = 201 - x z − x = 200 z = 200 + x x + y + z = x + 201 - x + 200 + x x + y + z = 401 + x x + y = 201 mean : x < 201 / 2 x < 100.5 ________________________________________ For example : If x = 101 y = 201 - x = 201 - 101 = 100 That not satisfie ...

*April 19, 2013*

**Inequality Sum**

x + y = 201 y = 201 - x y > x that's why x < 201 / 2 x < 100.5 Nearest integer: x = 100 x + y = 201 y = 201 - x y = 201 - 100 y = 101 z − x = 200 z = 200 + x z = 200 + 100 z = 300 x + y + z = 100 + 101 + 300 = 501

*April 19, 2013*

**math**

17 m - 3 / 2 = 5 m + 14 Subtract 5 m to both sides 17 m - 3 / 2 - 5 m = 5 m + 14 - 5 m 12 m - 3 / 2 = 14 Add 3 / 2 to both sides 12 m - 3 / 2 + 3 / 2 = 14 + 3 / 2 12 m = 14 + 3 / 2 12 m = 28 / 2 + 3 / 2 12 m = 31 / 2 Divide both sides by 12 m = ( 31 / 2 ) / 12 m = 31 / ( 2 * ...

*April 19, 2013*

**math**

( a + b ) * c = 7 Divide both sides by ( a + b ) c = 7 / ( a + b )

*April 19, 2013*

**math**

a = first number b = a + 1 = socond number a b = 156 a ( a + 1 ) = 156 a ^ 2 + a = 156 Add 1 / 4 to both sides a ^ 2 + a + 1 / 4 = 156 + 1 / 4 a ^ 2 + a + 1 / 4 = 624 / 4 + 1 / 4 a ^ 2 + a + 1 / 4 = 625 / 4 ________________________________________ Remark : ( x + y ) ^ 2 = x ^ ...

*April 18, 2013*

**Math**

7 / a Multiply Numerator and Denominator by b 7 / a = 7 b / a b 9 / b Multiply Numerator and Denominator by a 9 / b = 9 a / a b 7 / a - 9 / b = 7 b / a b - 9 a / a b = ( 7 b - 9 a ) / a b

*April 18, 2013*

**math**

Type this question in google. You will find answer.

*April 18, 2013*

**arithmetic mean**

( 88 + 94 + 98 + 84 ) / 4 = 364 / 4 = 91

*April 18, 2013*

**math**

2 csc ( x ) - 3 = - 5 Add 3 to both sides 2 csc ( x ) - 3 + 3 = - 5 + 3 2 csc ( x ) = - 2 Divide both sides by 2 csc ( x ) = - 1 Solutions: x = 2 pi n - pi / 2 and x = 2 pi n + 3 pi / 2 n is an integer

*April 18, 2013*

**algebra**

You must solve equation: - 16 t ^ 2 + 64 t + 80 = 0 - 16 t ^ 2 + 64 t + 80 = 0 Divide both sides by - 16 - 16 t ^ 2 / - 16 + 64 t / - 16 + 80 / - 16 = 0 t ^ 2 - 4 t - 5 = 0 Add 5 to both sides t ^ 2 - 4 t - 5 + 5 = 0 + 5 t ^ 2 - 4 t = 5 Add 4 to both sides t ^ 2 - 4 t + 4 = 5...

*April 18, 2013*

**math**

For x = 27 / 4 y = 17 x / 27 = 17 / 4 x + y = 27 / 4 + 17 / 4 = 44 / 4 = 11

*April 17, 2013*

**math**

x ^ 2 + x y + x = 81 x ( x + y + 1 ) = 81 Divide both sides by x x + y + 1 = 81 / x y ^ 2 + x y + y = 51 y ( y + x + 1 ) = 51 y ( x + y + 1 ) = 51 Divide both sides by y x + y + 1 = 51 / y x + y + 1 = x + y + 1 81 / x = 51 / y Multiply both sides by x y 81 x y / x = 51 x y / y...

*April 17, 2013*

**Algebra**

7 p ^ 4 + p ^ 3 + 2 p ^ 2 + p = p ( 7 p ^ 3 + p ^ 2 + 2 p + 1 )

*April 15, 2013*

**algebra 1**

x ^ 2 - 4 x - 21 = 0 Add 21 to both sides x ^ 2 - 4 x - 21 + 21 = 0 + 21 x ^ 2 - 4 x = 21 Add 4 to both sides x ^ 2 - 4 x + 4 = 21 + 4 x ^ 2 - 4 x + 4 = 25 ________________________________________ Remark : ( a - b ) ^ 2 = a ^ 2 - 2 a b + b ^ 2 That's why : x ^ 2 - 4 x + 4...

*April 15, 2013*

**algebra 1**

a = first number b = a + 1 = second number c = b + 1 = a + 1 + 1 = a + 2 third number a + b + c = 99 a + a + 1 + a + 2 = 99 3 a + 3 = 99 Subtract 3 to both sides 3 a + 3 - 3 = 99 - 3 3 a = 96 Divide both sides by 3 a = 32 a = first number = 32 b =second number = 32 + 1 = 33 c...

*April 15, 2013*

**maths**

n = number of a ball 1 - 4 / 5 = 5 / 5 - 4 / 5 = 1 / 5 number of a red balls: n / 5 = 35 Multiply both sides by 5 n = 5 * 35 = 175 Number of a black balls : 175 * 4 / 5 = 700 / 5 = 140 140 - 35 = 105

*April 14, 2013*

**Math**

If your expression mean : ( 28 a ^ 11 b ^ 7 ) / ( 4 a ^ 3 b ) then : ( 28 a ^ 11 b ^ 7 ) / ( 4 a ^ 3 b ) = ( 28 / 4 ) * ( a ^ 11 / a ^ 3 ) * ( b ^ 7 / b ) = 7 a ^ 8 b ^ 6

*April 14, 2013*

**Math**

2 x ^ 2 + 7 x = 0 x ( 2 x + 7 ) = 0 Obviously solution x = 0 2 x + 7 = 0 Subtract 7 to both sides 2 x + 7 - 7 = 0 - 7 2 x = - 7 Divide both sides by 2 x = - 7 / 2 Solutions x = 0 and x = - 7 / 2 x ^ 2 - 4 = 2 x - 4 Add 4 to both sides x ^ 2 - 4 + 4 = 2 x - 4 + 4 x ^ 2 = 2 x ...

*April 14, 2013*

**math**

y / 9 = - 5 / 3 Multiply both sides by 9 y * 9 / 9 = - 5 * 9 / 3 y = - 5 * 9 / 3 y = - 5 * 3 * 3 / 3 y = - 5 * 3 y = - 15

*April 14, 2013*

**maths**

1 Ml = 1,000,000 l 13.5 Ml = 13,500,000 l 13,500,000 / 5 = 2,700,000 s = 45,000 min = 750 h = 31 day 6 h

*April 14, 2013*

**college math**

L = Length W = Width P = Perimeter L = W + 6 P = 2 L + 2 W = 2 ( L + W ) 120 = 2 ( W + 6 + W ) 120 = 2 ( 2 W + 6 ) 120 = 4 w + 12 Subract 12 to both sides 120 - 12 = 4 W 108 = 4 W Divide both sides by 4 27 = W W = 27 in L = W + 6 L = 27 + 6 L = 33 in

*April 13, 2013*

**algebra**

0.25 = 1 / 4 250 x 0.25 = 250 / 4 = 62.5

*April 10, 2013*

**precalculus**

( a - b ) ^ 2 = a ^ 2 - 2 a * b + b ^ 2 [ sin ( t ) - 1 ] ^ 2 = sin ^ 2 ( t ) - 2 * sin ( t ) * 1 + 1 ^ 2 = sin ^ 2 ( t ) - 2 sin ( t ) + 1 so : sin ^ 2 ( t ) - 2 sin ( t ) + 1 = [ sin ( t ) - 1 ] ^ 2 [ sin ^ 2 ( t ) - 2 sin ( t ) + 1 ] / [ sin ( t ) - 1 ] = [ sin ( t ) - 1...

*April 10, 2013*

**precalculus**

sin ( x ) = + OR - sqrt [ 1 - cos ( x ) ^ 2 ] sin ( x ) = + OR - sqrt ( 1 - 0.6 ^ 2 ) sin ( x ) = + OR - sqrt ( 1 - 0.36 ) sin ( x ) = + OR - sqrt ( 0.64 ) sin ( x ) = + OR - 0.8 In IV quadrant sin ( x ) are negative so : sin ( x ) = - 0.8 sin ( 2 x ) = 2 * sin ( x ) * cos ( x...

*April 10, 2013*

**precalculus**

3 pi /2 < x < 2 pi mean x lie in IV quadrant tan ( x ) = + OR - sqrt [ 1 - cos ( x ) ^ 2 ] / cos ( x ) in this case: tan ( x ) = + OR - sqrt ( 1 - 0.6 ^ 2 ) / 0.6 tan ( x ) = + OR - sqrt ( 1 - 0.36 ) / 0.6 tan ( x ) = + OR - sqrt ( 0.64 ) / 0.6 tan ( x ) = + OR - 0.8 / 0...

*April 10, 2013*

**Math**

C = d pi C = Circumference d = diameter C = d * pi In this case: C = 0.4 pi C = 0.4 * 3.14 = 1.256 m 1 km = 1000 m 1000 / 1.256 = 796.17834395 turns 797 turns rounded for full turn

*April 10, 2013*

**math**

Ó mean summ

*April 10, 2013*

**math**

( a + b + c) ^ n = Ó n ! / ( i! j! k! ) a ^ i b ^ j c ^ k where i + j + k = n So exponent of x ^ 3 y ^ 2 z ^ 2 = 7! / (3! 2! 2!) = 5040 / ( 6 * 2 * 2 ) = 5040 / 24 = 210

*April 10, 2013*

**Please help me...Please....Math**

x1/2 = [ - b + OR - sqrt ( b ^ 2 - 4 a c ) ] / 2a

*April 10, 2013*