Thursday

December 8, 2016
Total # Posts: 2,282

**Trigonometrt**

a. 810 ° = 720 ° + 90 ° = 2 * 360 ° + 90 ° So : sin ( 810 ° - theta ) = sin ( 90 ° - theta ) sin ( A - B ) = sin A * cos B - cos A * sin B In this case A = 90 ° , B = theta. sin 90 ° = 1 cos 90 ° = 0 sin ( 90 ° - theta ) = sin 90 &...

*April 9, 2016*

**Algebra**

x + 2 y = 10 Subtract x to both sides x + 2 y - x = 10 - x 2 y = 10 - x Divide both sides by 2 2 y / 2 = 10 / 2 - x / 2 y = 5 - x / 2 x ^ 2 + y ^ 2 = 25 x ^ 2 + ( 5 - x / 2 ) ^ 2 = 25 ________________________________ Remark: ( a - b ) ^ 2 = a ^ 2 - 2 * a * b + b ^ 2 ...

*April 6, 2016*

**math**

( - 8 ) * ( - 7 ) = ( - 1 * 8 ) * ( - 1 * 7 ) = ( - 1 ) * ( - 1 ) * 8 * 7 = 1 * 8 * 7 = 1 * 56 = 56

*April 5, 2016*

**Algebra 1**

a = larger number b = smaller number One third the sum of two numbers is 10. This mean: ( a + b ) / 3 = 10 Multiply both sides by 3 a + b = 30 Half the difference is 14. This mean: ( a - b ) / 2 = 14 Multiply both sides by 2 a - b = 28 Add b to both sides a - b + b = 28 + b a...

*April 5, 2016*

**Algebra**

4 x - 6 y - 3 = 7 x + 2 y - 4 Subtract 4 x to both sides 4 x - 6 y - 3 - 4 x = 7 x + 2 y - 4 - 4 x - 6 y - 3 = 3 x + 2 y - 4 Add 3 to both sides - 6 y - 3 + 3 = 3 x + 2 y - 4 + 3 - 6 y = 3 x + 2 y - 1 Subtract 2 y to both sides - 6 y - 2 y = 3 x + 2 y - 1 - 2 y - 8 y = 3 x - 1...

*April 5, 2016*

**maths**

( 14 / 40 ) * 100 % = 0.35 * 100 % = 35 %

*April 5, 2016*

**Math**

1 ft = 12 in 2 ft = 24 in r = 24 in = 2 ft The volume of a ball: V = ( 4 / 3 ) * pi * r ^ 3 = ( 4 * pi / 3 ) * 2 ^ 3 = ( 4 * 3.1416 / 3 ) * 2 ^ 3 = ( 12.5664 / 3 ) * 2 ^ 3 = 4.1888 * 2 ^ 3 = 4.1888 * 8 = = 33.5104 ft ^ 3

*April 5, 2016*

**math**

3 / 27 = 3 / ( 3 * 9 ) = 1 / 9 3 / 27 = 10 / x 1 / 9 = 10 / x Multiply both sides by 9 1 = 90 / x Multiply both sides by x x = 90 min OR x = ( 10 miles / 3 miles ) * 27 min = ( 10 / 3 ) * 27 min = 270 min / 3 = 90 min

*April 5, 2016*

**Social studies**

Ms.Sue Iam from Sarajevo, Bosnia and Herzegovina, former Yugoslavia citizen. YUGOSLAVIA WAS NEVER HAD SOVIET RULE. It was very different from the socialism of the Soviet.

*March 30, 2016*

**pr calc 11**

The numbers are: 8 an - 5 becouse: 8 * ( - 5 ) = - 40 and 8 - 5 = 3 x ^ 2 + 3 x - 40 = ( x + 8 ) ( x - 5 )

*March 30, 2016*

**pr calc 11**

( a + b ) ^ 2 = a ^ 2 + 2 a b + b ^ 2 so: ( x + 2 ) ^ 2 = x ^ 2 + 2 x * 2 + 2 ^ 2 = x ^ 2 + 4 x + 4 ( x + 2 ) ^ 2 - ( x + 2 ) - 42 = x ^ 2 + 4 x + 4 - x - 2 - 42 = x ^ 2 + 4 x + 4 - x - 44 = x ^ 2 + 4 x - x + 4 - 44 = x ^ 2 + 3 x - 40 Find two numbers whose product is - 40 and...

*March 30, 2016*

**Math**

Parabola - 5 t ^ 2 - 25 t is concave downward. That's why you get negative time. You can switch - 5 to 5. If you want to see graph go on: w o l f r a m a l p h a . c o m When page be open in rectangle type: - 5 t ^ 2 - 25 t , t = 0 to - 5 and click option: = You wil see ...

*March 29, 2016*

**math**

x = 0.6969... 100 x = 0.6969... * 100 = 69.6969... 100 x - x = 99 x = 69.6969... - 0.6969... = 69 99 x = 69 3 * 33 x = 3 * 23 Divide both sides by 3 33 x = 23 Divide both sides by 33 x = 23 / 33 0.6969... = 23 / 33

*March 24, 2016*

**math**

1 / 2 (14 x - 2 ) - 1 / 4 ( - 4 x - 24 ) = 14 x / 2 - 2 / 2 - ( - 4 x / 4 ) - ( - 24 / 4 ) = 14 x / 2 - 2 / 2 + ( 4 x / 4 ) + ( 24 / 4 ) = 7 x - 1 + x + 6 = 8 x + 5

*March 24, 2016*

**Math**

In google type: integration by parts online emathelp When you see list of results cilck on: Integral (Antiderivative) Calculator with Steps - eMathHelp When page be open in rectangle type: e^(3x) sin (2x) then clic option: CALCULATE You wil see solution step-by-step.

*March 24, 2016*

**algebra i**

You can square rooted only expresiion between brackets, not single number.

*March 21, 2016*

**algebra i**

( x - 4 ) ^ 2 = 625 Take square root to both sides + OR - ( x - 4 ) = 25 1 solution: x - 4 = 25 Add 4 to both sides x - 4 + 4 = 25 + 4 x = 29 2 solution: - ( x - 4 ) = 25 - x + 4 = 25 Subtract 4 to both sides - x + 4 - 4 = 25 - 4 - x = 21 Multiply both sides by - 1 x = - 21 ...

*March 21, 2016*

**Math haha**

7 / 2 = ( 7 / 2 ) * ( 3 / 3 ) = 21 / 6 ( 7 / 2 + 5 / 6 ) ^ 2 - ( 7 / 2 - 5 / 6 ) ^ 2 = ( 21 / 6 + 5 / 6 ) ^ 2 - ( 21 / 6 - 5 / 6 ) ^ 2 = ( 26 / 6 ) ^ 2 - ( 16 / 6 ) ^ 2 = 676 / 36 - 256 / 36 = ( 676 - 256 ) / 36 = 420 / 36 = ( 12 * 35 ) / ( 12 * 3 ) = 35 / 3

*March 20, 2016*

**Math-Measure's & area**

1. A = B * H = 82 * 16.6 = 1,361.2 2. 0.123333.... is a rational number becouse : 0.123333... = 37 / 300

*March 17, 2016*

**Math**

Rectangular pyramid

*March 17, 2016*

**algebra**

OR x + 9 y = 77 Multiply both sides by 7 7 * x + 9 y * 7 = 77 * 7 7 x + 63 y = 539 - 7 x - y = 27 _______________ 7 x - 7 x + 63 y - ( - y ) = 539 - 27 0 + 63 y + y = 512 64 y = 512 y = 512 / 64 = 8 x + 9 y = 77 x + 9 * 8 = 77 x + 72 = 77 Subtract 72 to both sides x + 72 - 72...

*March 13, 2016*

**algebra**

7 x - y = 27 Divide both sides by 7 7 x / 7 - y / 7 = 27 / 7 x - y / 7 = 27 / 7 x + 9 y = 77 x + 9 y * 7 / 7 = 77 * 7 / 7 x + 63 y / 7 = 539 / 7 Subtract x - y / 7 = 27 / 7 from equation x + 63 y / 7 = 539 / 7 x + 63 y / 7 = 539 / 7 - x - y / 7 = 27 / 7 ...

*March 13, 2016*

**Math**

Numbers 1 ÷ 9 are one digits numbers. Numbers 10 ÷ 30 are two digits numbers. Obviously Eric will write 9 one digits numbers and 21 two digits numbers. 9 * 1 + 21 * 2 = 9 + 42 = 51 digits

*March 9, 2016*

**Math**

55 = 11 * 5

*March 8, 2016*

**Math**

You can write original number as : x = 10 a + b Reverse number you can write as : y = 10 b + a x + y = 10 a + b + 10 b + a = 11 a + 11 b = 11 ( a + b ) Example : Original number: x = 23 a = 2 , b = 3 x = 10 a + b = 10 * 2 + 3 = 20 + 3 = 23 Reverse number: y = 10 b + a = 10 * 3...

*March 8, 2016*

**database**

Find answer on wikipedia.

*March 8, 2016*

**maths**

x = 0.27272727... 100 x = 100 * 0.27272727... 100 x = 27.27272727... 100 x - x = 99 x = 27.27272727... - 0.27272727... = 27 99 x = 27 9 * 11 x = 9 * 3 Divide both sides by 9 11 x = 3 Divide both sides by 11 x = 3 / 11

*March 7, 2016*

**Math**

A golden rectangle is a rectangle whose side lengths are in the golden ratio: phi = 1 / [ ( 1 + sqroot 5 ) / 2 ] W = L * phi W = 12 * 1 / [ ( 1 + sqroot 5 ) / 2 ] = 12 * 2 / ( 1 + sqroot 5 ) = 24 / ( 1 + sqroot 5 ) = 24 / ( 1 + 2.236068 ) = 24 / 3.236068 = 7.416408 ft W = 7.4 ...

*March 7, 2016*

**Math**

x ^ 2 + 10 = 7 x Subtract 7 x to both sides x ^ 2 + 10 - 7 x = 7 x - 7 x x ^ 2 - 7 x + 10 = 0 Now you must solve this quadratic equation. The solutions are : x = 2 and x = 5 Proof : 2 ^ 2 + 10 = 4 + 10 = 14 = 7 * 2 5 ^ 2 + 10 = 25 + 10 = 35 = 7 * 5

*March 6, 2016*

**math**

x1 = score math = 65 x2 = score arts = 86 x3 = score science = 84 x4 = score social studies = 78 x5 = score grammar average = ( x1 + x2 + x3 + x4 + x5 ) / 5 = 80 ( 65 + 86 + 84 + 78 + x5 ) / 5 = 80 ( 313 + x5 ) / 5 = 80 Multiply both sides by 5 313 + x5 = 80 * 5 313 + x5 = 400...

*March 5, 2016*

**Maths**

Copy your question in google. You will find answer.

*March 5, 2016*

**math**

(e ^ 3 / f ^ 2 ) ^ - 3 = 1 / (e ^ 3 / f ^ 2 ) ^ 3 = 1 / ( e ^ 9 / f ^ 6 ) = f ^ 6 / e ^ 9 ( e ^ - 4 / f ) ^ - 1 = 1 / [ ( 1 / e ^ 4 ) / f ] = 1 / [ 1 / ( e ^ 4 * f ) ] = e ^ 4 * f / 1 = e ^ 4 * f (e ^ 3 / f ^ 2 ) ^ - 3 * ( e ^ - 4 / f ) ^ - 1 = ( f ^ 6 / e ^ 9 ) * e ^ 4 * f = ...

*February 21, 2016*

**Algebra**

Yes y = 3 x + 7 = 4 * 7 = 28 3 x + 7 = 28 3 x = 28 - 7 = 21 x = 21 / 3 = 7 yrs 7 ft + 7 * 3 ft = 7 ft + 21 ft = 28 ft = 4 * 7 ft

*February 21, 2016*

**Math Help!**

6 - ( - 3 ) = 9 15 - 6 = 9 24 - 15 = 9 33 - 24 = 9 42 - 33 = 9 51 - 42 = 9 - 3 ,6 ,15 , 24 , 33 , 42 , 51 Arithmetic progression. Initial term a1 = - 3 Common difference d = 9

*February 17, 2016*

**PLZ HELP MATH**

p = pressure d = depth p = 14.7 + 14.7 ( d / 30 ) = 14.7 ( 1 + d / 30 ) In this case d = 1000 ft p = 14.7 ( 1 + 1000 / 30 ) = 14.7 ( 1 + 33.33 ) = 14.7 * 34.33 = 504.7 psi

*February 14, 2016*

**Algebra ASAP**

x ^ - 2 = 1 / x ^ 2 ( 6 x ^ - 2 ) ^ 2 = ( 6 / x ^ 2 ) ^ 2 = 6 ^ 2 / ( x ^ 2 ) ^ 2 = 36 / x ^ 4 ( 0.5 x ) ^ 4 = 0.5 ^ 4 * x ^ 4 = 0.0625 x ^ 4 ( 6 x ^ - 2 ) ^ 2 0.5 x ^ 4 = ( 36 / x ^ 4 ) * 0.0625 x ^ 4 = 36 * 0.0625 * x ^ 4 / x ^ 4 = 36 * 0.0625 = 2.25

*February 14, 2016*

**Math**

Probability that the 7th grader is a boy = number of boys/number of students = 3 / ( 3 + 3 ) = 3 / 6 = 1 / 2 Probability that the 8th grader is a boy = number of boys/number of students = 1 /( 4 + 1 ) = 1 /5 Probability that both are boys = 1 / 2 * ( 1 / 5 ) = 1 / 10 = 0.1 = 10 %

*February 14, 2016*

**math**

a1 = first number a2 = second number a3 = third number a2 = a1 + 2 a3 = a2 + 2 = a1 + 2 + 2 = a1 + 4 a1 + a2 + a3 = a1 + a1 + 2 + a1 + 4 = 3 a1 + 6 = 147 Subtract 6 to both sides 3 a1 + 6 - 6 = 147 - 6 3 a1 = 141 Divide both sides by 3 a1 = 141 / 3 = 47 a1 = 47 a2 = 47 + 2 = ...

*February 13, 2016*

**math**

n = Number of nickels q = Number of quarters He has 10 more nickels than quarters mean : n = q + 10 Justin has a total of 50 coins that are all nickels and quarters mean : n + q = 50 n = q + 10 so : n + q = 50 q + 10 + q = 50 2 q + 10 = 50 Subtract 10 to both sides 2 q + 10 - ...

*February 10, 2016*

**Algebra**

94 % = 94 / 100 = 0.94 $ 560,000 / 0.94 = $ 595744.68

*February 9, 2016*

**Math**

L = Lita's age J = Joe's age Lita is three times Joe's age mean : L = 3 J The difference of their ages is 10 mean : L - J = 10 L = 3 J so : L - J = 10 3 J - J = 10 2 J = 10 Divide both sides by 2 J = 10 / 2 = 5 L = 3 J = 3 * 5 = 15 Lita's present ages = 15 Joe...

*February 9, 2016*

**algebra equations**

x = a number 4 less than 5 times itself mean : 5 x - 4 x + 5 x - 4 = 27 6 x - 4 = 27 Add 4 to both sides 6 x - 4 + 4 = 27 + 4 6 x = 31 Divide both sides by 6 x = 31 / 6 Are you shure that the result is 27?

*February 9, 2016*

**math**

6 / 27 = 3 * 2 / ( 3 * 9 ) = 2 / 9

*February 6, 2016*

**Algebra**

4. 3 ( 4 - 2 x ) = - 2 x 3 * 4 - 3 * 2 x = - 2 x 12 - 6 x = - 2 x Add 6 x to both sides 12 - 6 x + 6 x = - 2 x + 6 x 12 = 4 x Divide both sides by 4 3 = x x = 3 Answer d 5. 5.4 + 0.2 x = - 1.4 x + 8.6 Subtract 5.4 to both sides 5.4 - 5.4 + 0.2 x = - 1.4 x + 8.6 - 5.4 0.2 x...

*February 1, 2016*

**math**

8 / 270 = x / 72.5 Multiply both sides by 72.5 72.5 * 8 / 270 = x 580 / 270 = x 2.148148 = x x = 2.148148 x = 2.1 fluid ounces Rounded to the nearest tenth.

*January 30, 2016*

**Math**

Substitute the values a = 4 , b = - 9 , c = - 9 into the quadratic formula x1/2 = [ - b +OR- sqroot( b ^ 2 - 4 a c ) ] / 2 a x1/2 = [ - ( - 9 ) +OR- sqroot( ( - 9 ) ^ 2 - 4 * 4 * ( - 9 ) ) ] / 2 * 4 x1/2 = [ 9 +OR- sqroot( 81 - 4 * ( - 36) ) ] / 8 x1/2 = [ 9 +OR- sqrt ( 81 + ...

*January 29, 2016*

**Math**

1 / 4 = 1 * 8 / ( 4 * 8 ) = 8 / 32 5 * 16 = 5 * 2 / ( 16 * 2 ) = 10 / 32 Your answer is correct.

*January 26, 2016*

**Algebra**

2 y - 8 = 3 y - 18 Subtract 2 y to both sides 2 y - 8 - 2 y = 3 y - 18 - 2 y - 8 = y - 18 Add 18 to both sides - 8 + 18 = y - 18 + 18 10 = y y = 10

*January 25, 2016*

**Math**

[ ( 8.3 + x ) / 11.2 ] * 8 ) = 16 Divide both sides by 8 [ ( 8.3 + x ) / 11.2 ] * 8 ) / 8 = 16 / 8 ( 8.3 + x ) / 11.2 = 2 Multiply both sides by 11.2 11.2 * ( 8.3 + x ) / 11.2 = 2 * 11.2 8.3 + x = 22.4 Subtract 8.3 to both sides 8.3 + x - 8.3 = 22.4 - 8.3 x = 14.1

*January 24, 2016*

**Math**

12 : 18 = 2 * 6 : ( 3 * 6 ) = 2 : 3 2 : x = 2 : 3 x = 3 Answer A 5 : 15 = 5 : ( 3 * 5 ) = 1 : 3 1 : 3 = x : 3 x = 1 Answer C

*January 21, 2016*

**math**

Did you read my answer?

*January 21, 2016*

**math**

r = first number r + 1 = second number r + 2 = third number r + r + 1 + r + 2 = 144 3 r + 3 = 144 Subtract 3 To both sides 3 r + 3 - 3 = 144 - 3 3 r = 141 Divide both sides by 3 r = 141 / 3 = 47 r + 1 = 48 r + 2 = 49 47 + 48 + 49 = 144

*January 21, 2016*

**Math**

75 % = 75 / 100 = 0.75 L = 124 ft W = 0.75 * L = 0.75 * 124 = 93 ft P = 2 L + 2 W = 2 ( L + W ) = 2 * ( 124 + 93 ) = 2 * 217 = 434 ft A = L * W = 124 * 93 = 11,532 ft ^ 2

*January 21, 2016*

**Maths**

L = 3 W d = sqroot ( L ^ 2 + W ^ 2 ) d = sqroot [ ( 3 W ) ^ 2 + W ^ 2 ] = sqroot ( 9 W ^ 2 + W ^ 2 ) = sqroot ( 10 W ^ 2 ) = 6 * sqroot ( 10 ) sqroot ( 10 ) * W = 6 * sqroot ( 10 ) Divide both sides by sqroot ( 10 ) W = 6 cm L = 3 W = 3 * 6 = 18 cm P = 2 L + 2 W = 2 ( L + W...

*January 21, 2016*

**Math**

y - 2 = 6 x + 3 Subtract 6 x + 3 to both sides y - 2 - ( 6 x + 3 ) = ( 6 x + 3 ) - ( 6 x + 3 ) y - 2 - 6 x - 3 = 0 y - 6 x - 5 = 0

*January 21, 2016*

**math**

1 h = 60 min Speed = ( 4 / 5 ) mile * 60 min / 9 min Speed = ( 4 / 5 ) * 60 / 9 = 4 * 60 / 5 * 9 = 240 / 45 = 2 * 2 * 2 * 2 * 3 * 5 / ( 3 * 3 * 5 ) = 2 * 2 * 2 * 2 / 3 = 16 / 3 miles / hour

*January 21, 2016*

**Math**

150 % = 150 / 100 = 1.5 1.5 * 25,800 = 38,700

*January 13, 2016*

**Algebra**

In google type : functions graphs online When you see list of results click on : Draw Function Graphs - Plotter - Rechneronline When page be open in blue rectangle type : x + 3 In gray rectangle type : - 2 x - 3 Then click option : Draw Solution : x = - 2 , y = 1

*January 13, 2016*

**Math 10**

1 yd = 91.44 cm 5 yd = 5 * 91.44 = 457.2 cm 457.2 cm / 50 cm = 9.144 = 9 + 0.144 pieces 9 pieces + 0.144 * 50 cm = 9 pieces + 7.2 cm

*January 5, 2016*

**Math**

b ) ( 2 / 5 ) ^ 3 = 8 / 125

*January 5, 2016*

**Math**

If two polygons are similar, the ratio of their areas is equal to the square of the ratio of their corresponding sides. If two polygons are similar, the ratio of their volumes is equal to the cube of the ratio of their corresponding sides. a) ( 1 / 4 ) ^ 2 = 1 / 16 b ) ( 2 / 5...

*January 5, 2016*

**Maths**

As = Area of the smaller triangle = 28 square Al = Area of the larger triangle In two similar triangles, the ratio of their areas is the square of the ratio of their sides. As = Al * ( 2 / 5 ) ^ 2 As = Al * 4 / 25 As = 4 Al / 25 Multiply both sides by 25 25 As = 4 Al Divide ...

*January 4, 2016*

**Algebra! Errr, whatever it is.**

j = r b Divide both sides by b j / b = r r = j / b Answer d M = 300 J / P Multiply both sides by P P M = 300 J Divide both sides by 300 P M / 300 = J J = P M / 300 Answer d

*January 4, 2016*

**Math**

P2 = second pile

*December 23, 2015*

**Math**

P1 = first pile P3 = second pile P3 = third pile The first has 5 more books than the 2nd pile. This mean : P1 = P2 + 5 The number of books in the second pile is twice the number of books in the third pile. This mean : P2 = 2 P3 So if : P2 = 2 P3 and P1 = P2 + 5 then : P1 = P2...

*December 23, 2015*

**Math**

Type mistake. y = - 2 x - 12 = - 2 * ( - 8 ) - 12 = 16 - 12 = 4

*December 18, 2015*

**Math**

y = - 2 x - 12 = - 2 * ( - 8 ) - 2 = 16 - 12 = 4

*December 18, 2015*

**Math**

3 x + 4 ( x - 6 ) - 3 ( x - 7 ) 3 x + 4 * x + 4 * ( - 6 ) - 3 * x - 3 * ( - 7 ) = 3 x + 4 x - 24 - 3 x + 21 = 4 x - 3 Answer B

*December 18, 2015*

**Math**

- 6 - 7 ( c + 10 ) = - 6 - 7 * c - 7 * 10 = - 6 - 7 c - 70 = - 76 - 7 c Answer B

*December 18, 2015*

**Maths plz help**

x + y = 5 Possible combinations : x = 1 , y = 4 x = 2 , y = 3 x = 3 , y = 2 x = 4 , y = 1 x = 1 , y = 4 x ^ x + y ^ y = 31 1 ^ 2 + 2 ^ 2 = 31 1 + 4 = 31 Incorrect. x = 2 , y = 3 x ^ x + y ^ y = 31 2 ^ 2 + 3 ^ 3 = 31 4 + 27 = 31 Correct. x = 3 , y = 2 x ^ x + y ^ y = 31 3 ^ 3...

*December 18, 2015*

**math**

C = Present Chase's age R = Present Rosa's age Chase is 34 years younger than Rosa. This mean : C = R - 34 8 years ago, Rosa's was R - 8 yrs , Chase was C - 8 yrs 8 years ago, Rosa's age was 3 times Chase's age. This mean : R - 8 = = 3 ( C - 8) R - 8 = 3 * ...

*December 18, 2015*

**Math**

a = apples o = oranges 1 week : a + o = 108 2 week : 5 a + 3 o = 452 Now you must solve system of 2 equations with 2 unknown : a + o = 108 5 a + 3 o = 452 The method of substitution: a + o = 108 Subtract o to both sides a + o - o = 108 - o a = 108 - o 5 a + 3 o = 452 5 * ( 108...

*December 18, 2015*

**math**

Convert the numbers in decimal form. 2 / 3 = 0.6666 65 % = 65 / 100 = 0.65 7 / 10 = 0.7 Order : 0.64 , 65 % , 2 / 3 , 7 / 10

*December 18, 2015*

**Math**

My type mistake. s = ( 100 + 250 + 275 ) / 2 = 625 / 2 = 312.25 m

*December 11, 2015*

**Math**

Heron's Formula for the area of a triangle : A = sqrootÿ[ s ( s - a ) ( s - b ) ( s - c ) ] s is half the perimeter . s = ( a + b + c ) / 2 a = ( 100 + 250 + 275 ) / 2 = 625 / 2 = 312.25 m A = sqrootÿ[ s ( s - a ) ( s - b ) ( s - c ) ] A = sqrootÿ[ 312.25 ( ...

*December 11, 2015*

**Algebra**

x = - 2 / 3 - 6 x + 7 y = 11 - 6 * ( - 2 / 3 ) + 7 y = 11 12 / 3 + 7 y = 11 4 + 7 y = 11 Subtract 4 to both sides 4 + 7 y - 4 = 11 - 4 7 y = 7 Divide both sides by 7 y = 1 Coordinate x = - 2 / 3 , y = 1 OR ( - 2 / 3 , 1 )

*December 9, 2015*

**Math**

16 / 36 = 4 * 4 / ( 4 * 9 ) = 4 / 9

*December 9, 2015*

**Mathxxx!!!**

1. 4 x + 3 = 2 ( 2 x + 9 ) 5. a. 7 x - 12 = 8 x + 29 - x 7 x - 12 = 7 x + 29 Incorrect No solutions b. - 4 + 5 x = 2 ( 3 x - 4 ) - 4 + 5 x = 2 * 3 x - 2 * 4 - 4 + 5 x = 6 x - 8 Subtract 5 x to both sides - 4 + 5 x - 5 x = 6 x - 8 - 5 x - 4 = x - 8 Add 8 to both sides - 4 + 8...

*December 8, 2015*

**math**

f ( 17 ) = 0.01 ( 2 ) ^ x = 0.01 ( 2 ) ^ 17 = 0.01 * 131072 = 1310.72 f ( 10 ) = 0.01 ( 2 ) ^ x = 0.01 ( 2 ) ^ 10 = 0.01 * 1024 = 10.24 The average rate of change : [ f ( 17 ) - f ( 10 ) ] / ( 17 - 10 ) = [ f ( 17 ) - f ( 10 ) ] / 7 = ( 1310.72 - 10.24 ) / 7 = 1300.48 / 7 = ...

*December 8, 2015*

**Math**

Straight line equations: y = mx + b m = slope b = y-intercept ( Point on the graph where x is zero ) Difference between y coordinates is constant = 15 29 - 14 = 15 44 - 29 = 15 59 - 44 = 15 Slope = 15 y-intercept = y coordinate when x = 0 y-intercept = 14 So : m = 15 b = 14 y...

*December 8, 2015*

**Math**

You can write : y = ( x - 1896 ) / 150 like : P / Q = ( x - 1896 ) / 150

*December 8, 2015*

**Math**

If the ratio is a linear function then : Two point equation of straight line : y = y1 + [ ( y2 - y1 ) / ( x2 - x1 ) ] * ( x - x1 ) In this case : x1 = 1996 y1 = 2 / 3 x2 = 2001 y2 = 7 / 10 y = y1 + [ ( y2 - y1 ) / ( x2 - x1 ) ] * ( x - x1 ) y = 2 / 3 + [ ( 7 / 10 - 2 / 3...

*December 8, 2015*

**math**

60 percent = 60 % = 60 / 100 = 0.6 0.6 * 30 = 18 18 questions

*December 8, 2015*

**Algebra**

My misprint. 1.2912 * 100 % = 129.12 %

*December 3, 2015*

**Algebra**

412.99 / 319.85 = 1.2912 1.2912 * 100 = 129.12 % 129.12 % - 100 % = 29.12 % 29 % To the nearest whole percent.

*December 3, 2015*

**maths**

Reinny In w o l f r a m a l p h a . com type: solve ( x + y ) / 2 = sqroot ( x * y ) + 2 , 2 / ( 1 / x + 1 / y ) = x / 5 The solutions are : 9 and 1

*December 1, 2015*

**Math**

Not at all. highest concentration = infinity as x tends towards 0.

*November 30, 2015*

**Math**

The question does not make sense. a t / t ^ 2 = 3 t / t ^ 2 = 3 t / ( t * t ) = 3 / t a t / t ^ 2 + b = 3 t / t ^ 2 + 1 = 3 / t + 1 Tends to infinity as x tends towards 0.

*November 30, 2015*

**6 grade Math**

241.5 / 12.5 = 193.2 / x Multiply both sides by 12.5 241.5 * 12.5 / 12.5 = 193.2 * 12.5 / x 241.5 = 2415 / x Multiply both sides by x 241.5 * x = 2415 * x / x 241. 5 x = 2415 Divide both sides by 241.5 2415.5 x / 241.5 = 2415 / 241.5 x = 10 cm ^ 3 OR 12.5 / 241.5 = 0....

*November 30, 2015*

**math**

A = Area r = radius d = diameter A = r ^ 2 pi OR r = d / 2 A = r ^ 2 pi = ( d / 2 ) ^ 2 * pi = ( d ^ 2 / 4 ) * pi = d ^ 2 pi / 4

*November 30, 2015*

**Solving Trig Equations**

Trigonometric identity: sin ( - x ) = - sin x On interval [ 0 , pi ] [ 0 , 180 ° ] you have 2 angles with sin x = sqroot ( 3 ) / 2 x = pi / 3 = 60 ° and x = 2 pi / 3 = 120 ° So if sin ( - x ) = sin x on interval [ - pi , 0 ] [ - 180 ° , 0 ] you have 2 angles ...

*November 27, 2015*

**Algebra 2**

sqrt ( - 28 ) = sqrt ( - 4 * 7 ) = sqrt ( - 1 * 4 * 7 ) = sqrt ( - 1 ) * sqrt ( 4 ) * sqrt ( 7 ) = i * 2 * sqrt ( 7 ) = 2 i sqrt ( 7 )

*November 27, 2015*

**algebra**

Yes. 8 x ^ 2 + 3 ( x ^ 2 + y ) = 8 x ^ 2 + 3 * x ^ 2 + 3 * y = 8 x ^ 2 + 3 x ^ 2 + 3 y = 11 x ^ 2 + 3 y 7 x ^ 2 + 7 y + 4 x ^ 2 - 4 y = 7 x ^ 2 + 4 x ^ 2 + 7 y - 4 y = 11 x ^ 2 + 3 y

*November 27, 2015*

**Math Algebra**

2 % = 2 / 100 = 0.02 2 % of 5 = 0.02 * 5 = 0.1 3 % = 3 / 100 = 0.03 3 % of 12 = 0.03 * 12 = 0.36 The new fraction: ( 5 - 0.1 ) / ( 12 + 0.36 ) = 4.9 / 12.36 Multiply numerator and enominator by 100 490 / 1236 = 2 * 5 * 7 * 7 / ( 2 * 2 * 3 * 103 ) = 5 * 7 * 7 / ( 2 * 3 * 103...

*November 27, 2015*

**math**

W = Wide H = height D = Diagonal W / H = 16 / 9 20 / H = 16 / 9 Multiply both sides by 9 20 * 9 / H = 16 * 9 / 9 180 / H = 16 Multiply both sides by H 180 * H / H = 16 * H 180 = 16 H Divide both sides by 16 180 / 16 = 16 H / 16 11.25 = H H = 11.25 in Pythagorean theorem : D = ...

*November 27, 2015*

**Math**

25 / ( pi + 6 ) = 25 / ( 3.1415926535 + 6 ) = 25 / 9.1415926535 = 2.734753226 approx. = 2.73 What is problem?

*November 26, 2015*

**Math**

A = first angle B = second angle In the right triangel summ of angles = 180 ° If the sum of two acute angles in a right triangle is 90 degrees this mean : A + B = 180 ° - 90 ° = 90 ° A + B = 90 ° Twice the first is 40 degrees more than thrice the second. ...

*November 26, 2015*

**Math**

The length of the rectangle 5cm more than twice the width. This mean : L = 5 + 2 W P = 2 W + 2 L = 2 ( W + L ) 70 = 2 ( W + L ) 70 = 2 ( W + 5 + 2W ) 70 = 2 ( 3 W + 5 ) Divide both sides by 2 70 / 2 = 2 ( 3 W + 5 ) / 2 35 = 3 W + 5 Subtract 5 to both sides 35 - 5 = 3 W + 5 - 5...

*November 26, 2015*

**Mathematics**

If " n " is an integer, then n, n + 2, n + 4 and n + 6 will be even consecutive integers. Four times the greatest is 36 more than more than the sum of the other three. This mean : 4 ( n + 6 ) = 36 + ( n + n + 2 + n + 4 ) 4 ( n + 6 ) = 36 + ( n + n + 2 + n + 4 ) 4 * n...

*November 26, 2015*

**Math**

If you think on circumference of a circle. C = d * pi pi = 22 / 7 C = d * pi C = 2.1 * ( 22 / 7 ) = 2.1 * 22 / 7 = 46.2 / 7 = 6.6

*November 26, 2015*