Thursday

December 18, 2014

December 18, 2014

Total # Posts: 1,775

**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*

**calculus**

Go on: wolframalpha dot com When page be open in rectangle type: derivative your expresion solve y'=xy^3/ã(1+x^2) After few seconds when you see result click option: Show steps
*April 10, 2012*

**calculus**

Go on: wolframalpha dot com When page be open in rectangle type: solve y''+y'-6y=0 and click option = After few seconds when you see result click option: Show steps
*April 10, 2012*

**Calculus I**

Go on: wolframalpha dot com When page be open in rectangle type: derivative your expresion and click option = After few seconds when you see result click option: Show steps If square root) x + (2nd sq root) x + (3rd sq root) x mean sqrt(x )+2*sqrt(x)+3*sqrt(x) type: derivative...
*April 10, 2012*

**wave on**

Sound wave
*April 10, 2012*

**algebra**

4 y ^ 5 + 3 y -( -2 y ^ 5 - 8 y + 9 ) = 4 y ^ 5 + 3 y - ( -2 y ^ 5 ) - ( - 8 y ) - 9 = 4 y ^ 5 + 3 y + 2 y ^ 5 + 8 y - 9 = 6 y ^ 5 + 11 y - 9
*April 10, 2012*

**Geometry**

In an equilateral triangle : h = a * sqrt ( 3 ) / 2 26 = a * sqrt ( 3 ) / 2 Multiply both sides by 2 26 * 2 = a * sqrt ( 3 ) 52 = a * sqrt ( 3 ) divide both sides by sqrt ( 3 ) 52 / sqrt ( 3 ) = a 52 / 1.73205 = a 30.022228 in = a a = 30.022228 in 1 in = 2.54 cm a = 30.022228...
*April 10, 2012*

**Geometry**

Pitagorin teorem : diagonal = sqrt ( a ^ 2 + a ^ 2 ) diagonal = sqrt ( 2 * a ^ 2 ) diagonal = a * sqrt ( 2 ) 13 = a * sqrt ( 2 ) Divide both sides by aqrt ( 2 ) 13 / sqrt ( 2 ) = a 13 / 1.41421 = a 9.19241131 = a a = 9.19241131 m 1 m = 100 cm a = 9.19241131 m = 919.241131 cm a...
*April 10, 2012*

**Geometry**

diagonal = sqrt ( 95 ^ 2 + 95 ^ 2 ) diagonal = sqrt ( 2 * 95 ^ 2 ) diagonal = sqrt ( 2 * 9025 )
*April 10, 2012*

**Geometry**

Pitagorin teorem: diagonal = sqrt ( 95 ^ 2 + 95 ^ 2 ) diagonal = sqrt ( 2 * 9025 ) ---------------------- Remark : 9025 = 5 * 5 * 19 * 19 9025 = 5 ^ 2 * 19 ^ 2 ---------------------- diagonal = sqrt ( 2 * 9025 ) diagonal = sqrt ( 2 * 5 ^ 2 * 19 ^ 2 ) diagonal = 5 * 19 * sqrt...
*April 10, 2012*

**math**

BMI = 703 * w / h ^ 2 BMI = 30 h = 65 in 30 = 703 * w / 65 ^ 2 30 = 703 * w / 4225 Multiply both sides by 4225 30 * 4225 = 703 * w 126750 = 703 * w Divide both sides by 703 126750 / 703 = w 180.29872 = w w = 180.29872 lb
*April 10, 2012*

**Area Geometry**

Area of a regular polygon: A = ( 1 / 2 ) * n * r ^ 2 * sin ( 360 ° / n ) The area of a decagon: ( n = 10 ) ( r = 4 mm ) ( sin 36 ° = sqrt [ 10 - 2 sqrt ( 5 ) ] / 4 A = ( 1 / 2 ) * 10 * 4 ^ 2 * sin ( 360 ° / 10 ) A = 10 / 2 * 16 * sin ( 36 ° ) A = 5 * 16 * sin...
*April 10, 2012*

**algebra 1**

If 3/5g+4=6 1/3 mean 3 / ( 5 g ) + 4 = 6 1 / 3 then: 3 / ( 5 g ) + 4 = 6 1 / 3 3 / ( 5 g ) = 6 1 / 3 - 4 3 / ( 5 g ) = 2 1 / 3 3 / ( 5 g ) = 6 / 3 + 1 / 3 3 / ( 5 g ) = 7 / 3 Multiply both sides by 3 3 * 3 / ( 5 g ) = 7 9 / ( 5 g ) = 7 Mulitiply both sides by g 9 / 5 = 7 g ...
*April 9, 2012*

**trig**

3 cos ^ 2 theta - 5 cos theta - 1 - 3 sin ^ 2 theta = 0 3 cos ^ 2 theta - 5 cos theta - 1 - 3 ( 1 - cos ^ 2 theta ) = 0 3 cos ^ 2 theta - 5 cos theta - 1 - 3 + 3 cos ^ 2 theta = 0 6 cos ^ 2 theta - 5 cos theta - 4 = 0 Substitute : u = cos theta 6 u ^ 2 - 5 u - 4 = 0 The exact ...
*April 9, 2012*

**geometry**

Volume of a cone: V = ( 1 / 3 ) * r ^ 2 * pi * h r ^ 2 * pi = B The area of the circle base V = ( 1 / 3 ) * B * h V = 138 m ^ 3 B = 46 m ^ 2 138 = ( 1 / 3 ) * 46 * h Multiply both sides by 3 3 * 138 = 1 * 46 * h 414 = 46 h Divide both sides by 46 414 / 46 = h h = 414 / 46...
*April 9, 2012*

**Math**

19 / 6 + 4 y = 8 y - 1 / 6 19 / 6 + 1 / 6 = 8y - 4 y 20 / 6 = 4 y Multiply both sides by 6 20 = 6 * 4 y 20 = 24 y 20 = 24 y Divide both sides by 24 20 / 24 = y 4 * 5 / ( 4 * 6 ) = y 5 / 6 = y y = 5 / 6
*April 7, 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: x ^ 2 - 6 x + 13 = 0 and click option: solve it! You wil see solution step-by-step
*April 7, 2012*

**Algebra**

(k^2+9)/((k+9)*(k+9))= (k^2+9)/(k+9)^
*April 7, 2012*

**Algebra**

k ^ 2 + 6 k + 9 = ( x + 3 ) * ( x + 3 ) k ^ 2 + 12 k + 27 = ( x + 9 ) * ( x + 3 ) ((k^2+6k+9)/(k+9)*(k+3)))*(k^2+9)/((k^2+12k+27))= ((k+3)*(k+3))/((x+9)*(k+3)) * ((k^2+9)/(((x+9)*(k+3))= ((k+3))/((x+9)) * ((k^2+9)/(((x+9)*(k+3))= (k^2+9)/((x+9)*(k+9))= (k^2+9)/(x+9)^2
*April 7, 2012*

**Math 141**

The answers a) and b) are correct. c ) ( x - 1 ) ^ ( 7 / 2 ) - ( x - 1 ) ^ ( 3 / 2 ) = ( x - 1 ) ^ ( 3 / 2 ) * [ ( x - 1 ) ^ ( 4 / 2 ) - 1 ] = ( x - 1 ) ^ ( 3 / 2 ) * [ ( x - 1 ) ^ 2 - 1 ] = ( x - 1 ) ^ ( 3 / 2 ) * [ x ^ 2 - 2x + 1 - 1 ] = ( x - 1 ) ^ ( 3 / 2 ) * ( x ^ 2 - 2x...
*April 7, 2012*

**Trig**

Supplement angle of 3 pi / 5 is: 2 pi - 3 pi / 5 = ( 10 pi - 3 pi ) /5 = 7 pi / 5 You expect somebody to do ALL your homework?
*April 7, 2012*

**Trig**

( a - b ) ( a + b ) = a ^ 2 - b ^ 2 ( 1 - sin è )( 1 + sin è ) = 1 ^ 2 - sin ^ 2 è = 1 - sin ^ 2 è = cos ^ 2 è
*April 7, 2012*

**Trig**

19 pi / 7 = ( 14 + 5 ) * pi / 7 = ( 14 / 7 ) pi + ( 5 / 7 ) pi = 2 pi + ( 5 / 7 ) pi 2 pi + theta = theta I quadrant 0 ÷ pi / 2 II quadrant pi / 2 ÷ pi III quadrant pi ÷ ( 3 / 2 ) pi IV quadrant ( 3 / 2 ) pi ÷ 2 pi theta = ( 5 / 7 ) pi theta = 0....
*April 7, 2012*

**math**

( 3 y / x ^ 4 )^ - 3 = 1 / [ ( 3 y / x ^ 4 )^ 3 ] = -------------------- Remark: 3 ^ 3 = 27 ( x ^ 4 ) ^ 3 = x ^ ( 4 * 3 ) = x ^ 12 ----------------------- 1 / ( 27 y ^ 3 / x ^ 12 ] = x ^ 12 / 27 y ^ 3
*April 7, 2012*

**Algebra 2**

x y = - 7 Divide both sides by x y = - 7 / x That equation has no solutions 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: - 7 / x Set: Range x-axis from - 25 to 25 ...
*April 6, 2012*

**math**

Pythagorean Theorem : c ^ 2 = a ^ 2 + b ^ 2 c = sqrt ( a ^ 2 + b ^ 2 ) c = sqrt ( 13 ^ 2 + 35 ^ 2 ) c = sqrt ( 169 + 1225 ) c = sqrt ( 1394 ) c = 37.336 km
*April 5, 2012*

**alg2/trig**

Quadratic equation has two real equals roots, if Discrininant Ä = 0 Ä = greek letter Delta
*April 5, 2012*

**alg2/trig**

4 x ^ 2 + 9 = kx 4 x ^ 2 - k x + 9 = 0 Quadratic equation has two real roots, if Discrininant Ä = 0 Ä = b ^ 2 - 4 * a * c In this case : a = 4 b = - k c = 9 Ä = b ^ 2 - 4 * a * c Ä = ( - k ) ^ 2 - 4 * ( 4 ) * 9 Ä = k ^ 2 - 144 = 0 k ^ 2 - 144 = 0 k ^ 2...
*April 5, 2012*

**Trig.**

è is greek letter theta
*April 5, 2012*

**Trig.**

Go on: wolframalpha dot com When page be open in rectangle type: solve 2tan^2è-2tanè=3 and click option = After few seconds when you see result click option: Show steps Solutions are : è = -58.71608 ° è = - 59 ° to the nearest degree and &...
*April 5, 2012*

**Alebra**

Divided by zero is undefined When: x - 2 = 0 x = 2 your expression is undefined.
*April 5, 2012*

**algebra**

t = 14 min M = −0.001 * t ^ 3 + 0.1 * t ^ 2 M = −0.001 * 14 ^ 3 + 0.1 * 14 ^ 2 M = −0.001 * 2744 + 0.1 * 196 M = - 2.744 + 19.6 M = 16.856 words
*April 5, 2012*

**Math-alg-calc**

x ^ ( - 1 / 7 ) = ( 1 / 2 ) mean 1 / seventh root of ( x ) = 1 / 2 reciprocal value: seventh root of ( x ) = 2 Raise both sides to the power of 7 [ seventh root of ( x ) ] ^ 7 = 2 ^ 7 x = 2 ^ 7 = 128
*April 5, 2012*

**Math**

a 1 = first number a 2 = a 1 + 1 = second number a 3 = a 1 + 2 = third number a 4 = a 1 + 3 = fourth number a 5 = a 1 + 4 = fifth number a 6 = a 1 + 5 = sixth number a 7 = a 1 + 6 = seventh number a 8 = a 1 + 7 = eighth numer a 9 = a 1 + 8 = ninth number a 10 = a 1 + 9 = tenth...
*April 4, 2012*

**Intermediate Algebra**

9 x ^ 2 + 5 x - 4 + ( - 8 x ^ 2 + 9 x - 9 ) = 9 x ^ 2 + 5 x - 4 - 8 x ^ 2 + 9 x - 9 = 9 x ^ 2 - 8 x ^ 2 + 5 x + 9 x - 4 - 9 = x ^ 2 + 14 x - 13
*April 3, 2012*

**MathLog#4**

1 / a - 1 / b = c 1 / a = c - 1 / b 1 / a = c b / b - 1 / b 1 / a = ( c b - 1 ) / b Reciprocal : a = b / ( c b - 1 )
*April 2, 2012*

**MATH HELP!**

n * ln ( a ) = ln ( a ^ n ) 2 ln ( x ) = ln ( x ^ 2 ) 3 ln ( y ) = ln ( y ^ 3 ) ( 1 / 2 ) ln ( z ) = ln [ z ^ ( 1 / 2 ) ] = ln [ sqrt ( z) ] ln ( a ) + ln ( b ) = ln ( a * b ) ln ( a ) - ln ( b ) = ln ( a / b ) In this case: 2 ln ( x ) - 3 ln ( y ) + ( 1 / 2 ) ln ( z ) = 2 ln...
*April 1, 2012*

**Trigonometry**

cos ^ 2 ( x ) = 1 - sin ^ 2 ( x ) sin ^ 2 ( x ) - cos ^ 2 ( x ) = 0 sin ^ 2 ( x ) - [ 1 - sin ^ 2 ( x ) ] = 0 sin ^ 2 ( x ) - 1 + sin ^ 2 ( x ) = 0 2 sin ^ 2 ( x ) - 1 = 0 2 sin ^ 2 ( x ) = 1 Divide both sides by 2 sin ^ 2 ( x ) = 1 / 2 sin ( x ) = ± 1 / sqrt ( 2 ) ...
*April 1, 2012*

**Intermediate Algebra**

A. x = 5 f ( 5 ) = 2 * 5 + 3.50 = 10 + 3.50 = 13.50 $ B. x = 3 / 4 f ( 3 / 4 ) = 2 * 3 / 4 + 3.50 = 6 / 4 + 3.50 = 6 / 4 + 7 / 2 = 6 / 4 + 14 / 4 = 20 / 4 = 5 $ C. f ( x ) = 50 50 = 2 x + 3.5 50 - 3. 5 = 2 x 46 . 5 = 2 x Divide both sides by 2 46.5 / 2 = x 23.25 = x x = 23.25 ...
*April 1, 2012*

**Math situations**

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: 2 x ^ 2 - 3 x = - 6 and click option: solve it! You wil see solution step-by-step
*March 31, 2012*

**Math**

When the leading coefficient a is positive, the parabola opens up ( concave up ) For function: x ^ 2 - 2 x - 8 the leading coefficient is a = 1 function is concave up When the parabola ia concawe up all walues between roots are negative. No negative number can have a real ...
*March 31, 2012*

**algebra**

V = r ^ 2 * pi * h V = 8 ^ 2 * pi * 12 V = 64 * pi * 12 V = 2412.743 ft ^ 3
*March 31, 2012*

**maths**

252 = 2 * 2 * 3 * 3 * 7
*March 31, 2012*

**Algebra**

C = Circumference A = Area r = Radius C = 2 r pi Divide both sides with 2 pi C / 2 pi = r r = C / 2 pi A = r ^ 2 pi A = ( C / 2 pi ) ^ 2 * pi A = ( C ^ 2 / 4 pi ^ 2 ) * pi A = C ^ 2 / 4 pi A = 25 ^ 2 / 4 pi A = 625 / ( 4 * 3. 14 ) A = 625 / 12.56 A = 49.761 m ^ 2 A = approx. ...
*March 30, 2012*

**algebra**

a + 6 b = 14 - a - 2 b = - 2 --------------- 6 b - 2 b = 14 - 2 4 b = 12 Divide both sides by 4 b = 12 / 4 b = 3 a + 6 b = 14 a + 6 * 3 = 14 a + 18 = 14 a = 14 - 18 a = - 4
*March 30, 2012*

**math**

A = Area W = Width L = Length P = Perimeter A = W * L 54 = W * 9 Divide both sides by 9 54 / 9 = W 6 = W W = 6 ft P = 2 ( W + L ) P = 2 ( 9 + 6 ) P = 2 * 15 P = 30 ft
*March 30, 2012*

**Math situation**

( a - 4 ) ^ 2 = a ^ 2 - 2 * a * 4 + 4 ^ 2 = a ^ 2 - 8 a + 16 2 a ^ 2 -1 6 a + 32 = 2 * [ ( a - 4 ) ]^ 2 ( 64 a ^ 2 ) / ( 2 a ^ 2 - 16 a + 32 ) * ( 2 a - 8 ) / 8 a = ( 64 a ^ 2 / 8 a ) * ( 2a - 8 ) / 2 * [ ( a - 4 ) ] ^ 2 = 8 a * ( 2 a - 8 ) / [ 2 * [ ( a - 4 ) ]^ 2 = [ 8 a * 2...
*March 30, 2012*

**algebra**

r ^ 3 + 216 / r + 6 = r ^ 3 * r / r + 216 / r + 6 r / r = ( r ^ 4 + 216 + 6 r )/ r= ( r ^ 4 + 6 r + 216 ) / r
*March 30, 2012*

**math problem**

All parts of the uneqiations must be large of 0 Less part is ( x - 12 ) Solution x > 12
*March 30, 2012*

**Calculus**

Go on: wolframalpha dot com When page be open in rectangle type: partial fractions (x - x^3) / (x^4 +1) and click option = After few seconds when you see result click option: Show steps Then type: integrate (x - x^3) / (x^4 +1) After few seconds when you see result click ...
*March 30, 2012*

**algebra**

m = 0 b = - 4 y = mx + b y = 0 * x + ( - 4 ) y = 0 - 4 y = - 4
*March 30, 2012*

**Math Problem**

c ^ 16 = c ^ 7 * c ^ 9 c ^ 7 / ( c ^ 7 * c ^ 9 ) = 1 / c ^ 9 = c ^ - 9
*March 30, 2012*

**math**

( 1 / 2 ) x + 360 = ( 4 / 5 ) x 360 = ( 4 / 5 ) x - ( 1 / 2 ) x 360 = ( 8 / 10 ) x - ( 5 / 10 ) x 360 = ( 3 / 10 ) x ( 3 / 10 ) x = 360 Multiply both sides by 10 3 x = 360 * 10 3 x = 3600 Divide both sides by 3 x = 3600 / 3 x = 1200 pennies
*March 30, 2012*

**math problem**

- 12 a ^ 2 + 3 a + 3 - ( 6 a ^ 2 + 3 ) = - 12 a ^ 2 + 3 a + 3 - 6 a ^ 2 - 3 = - 12 a ^ 2 - 6 a ^ 2 + 3 a + 3 - 3 = - 18 a ^ 2 + 3 a = 3 a ( - 6 a + 1 ) = 3 a ( 1 - 6 a ) = -3 a ( 6 a - 1 )
*March 30, 2012*

**Math11**

A) 1 / 128 B ) 30 * 128 = 3840 cm = 38.4 m Remark: 1 m = 100 cm 3840 cm / 100 cm = 38.4 m
*March 30, 2012*

**Intermediate Algebra**

2.43 * 10 ^ - 4
*March 30, 2012*

**Tech math**

y = sin ( 2 x + 75 ° ) x = 295 ° y = sin ( 2 * 295 ° + 75 ° ) y = sin ( 590 ° + 75 ° ) y = sin ( 665 ° ) y = sin ( 360 ° + 305 ° ) ------------------------------------ Remark: sin ( 360 ° + theta ) = sin ( theta...
*March 30, 2012*

**Math**

1 revolution = 2 pi radians 450 pi / 2 pi = 225 revolutions
*March 30, 2012*

**Math**

1 2 5 10 17 26 37 50 65 82 If you subtract 1 from every number is should be obvious. 0 1 4 9 16 25 36 64 81 These are the perfect squares. So the answer is: n ^ 2 + 1 Next nunbers : 10 ^ 2 + 1 = 100 + 1 =101 11 ^ 2 + 1 = 121 + 1 = 122 13 ^ 2 + 1 = 169 + 1 = 170 14 ^ 2 + 1 = ...
*March 30, 2012*

**math**

1 - ( 1 / 2 + 1 / 3 ) = 1 - ( 3 / 6 + 2 / 6 ) = 1 - 5 / 6 = 6 / 6 - 5 / 6 = 1 / 6
*March 29, 2012*

**trig**

2 sin ^ 2 ( x ) - 1 = 0 2 sin ^ 2 ( x ) = 1 Divide both sides by 2 sin ^ 2 ( x ) = 1 / 2 sin ( x ) = ± 1 / sqrt ( 2 ) sin ( x ) = 1 / sqrt ( 2 ) for x = pi / 4 and x = 3 pi / 4 sin ( x ) = - 1 / sqrt ( 2 ) for x = 5 pi / 4 and x = 7 pi / 4
*March 29, 2012*

**geometry**

350 * 24 * 30 / ( 8 * 10 ) = 350 * 720 / 80 = 350 * 9 = 3150 $
*March 29, 2012*

**Geometry**

2 / 5 = 7 / x Multiply both sides by x 2 x / 5 = 7 Multiply both sides by 5 2 x = 7 * 5 2 x = 35 Divide both sides by 2 x = 35 / 2 x = 17.5 ft
*March 29, 2012*

**math**

1 h = 60 min 60 / 4 = 15 15 * 52 = 780 miles / hour OR 52 / 4 = 13 miles / min
*March 28, 2012*

**Math**

- 3 y + 5 > 23 - 3 y > 23 - 5 - 3 y > 18 FDivide both sides by - 3 --------------------------------------- Remark : Whenever you multiply or divide an inequality by a negative number, you must reverse the inequality sign. --------------------------------------- y <...
*March 28, 2012*

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