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The answer in the back of the book is x=(d+b)/(a+c). I don't get the /(a+c) part. Can you explain in more detail? 1 solutions
Answer 359983 by jim_thompson5910(28595) on 2012-01-02 16:01:15 (Show Source):
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Linear-equations/551869: Find the x and y intercepts and graph the equation plotting the intercepts.
-3x-5y=15 1 solutions
Answer 359978 by jim_thompson5910(28595) on 2012-01-02 15:56:32 (Show Source):
You can put this solution on YOUR website!
x-intercept
To find the x-intercept, plug in  and solve for x
 Start with the given equation.
 Plug in  .
 Multiply  and 0 to get 0.
 Simplify.
 Divide both sides by  to isolate  .
 Reduce.
So the x-intercept is ) .
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y-intercept
To find the y-intercept, plug in  and solve for y
 Start with the given equation.
 Plug in  .
 Multiply  and 0 to get 0.
 Simplify.
 Divide both sides by  to isolate  .
 Reduce.
So the y-intercept is ) .
Now let's plot the points ) and ) which are the x and y intercepts respectively.
Now draw a straight line through the plotted points to graph  .
 Graph of
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Numbers_Word_Problems/551834: The sum of three time a number and 7 more than the number is the difference between -11 and twice the number. What is the number? 1 solutions
Answer 359963 by jim_thompson5910(28595) on 2012-01-02 14:56:39 (Show Source):
You can put this solution on YOUR website!"The sum of three time a number and 7 more than the number is the difference between -11 and twice the number" translates to
 Start with the given equation.
 Combine like terms on the left side.
 Subtract  from both sides.
 Add  to both sides.
 Combine like terms on the left side.
 Combine like terms on the right side.
 Divide both sides by  to isolate  .
 Reduce.
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Answer:
So the solution is
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Equations/551831: about 2/3 of an orchestra is made up of string instruments. If 1/5 of the string instruments are violins, what fraction of the orchestra if made up of violins? 1 solutions
Answer 359958 by jim_thompson5910(28595) on 2012-01-02 14:47:27 (Show Source):
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Quadratic_Equations/551828: Solve: 5x^2 -4x -33 = 0
1 solutions
Answer 359956 by jim_thompson5910(28595) on 2012-01-02 14:45:31 (Show Source):
You can put this solution on YOUR website!
 Start with the given equation.
Notice that the quadratic  is in the form of  where  ,  , and
Let's use the quadratic formula to solve for "x":
 Start with the quadratic formula
 Plug in  ,  , and
 Negate  to get  .
 Square  to get  .
 Multiply  to get
 Rewrite  as
 Add  to  to get
 Multiply  and  to get  .
 Take the square root of  to get  .
 or  Break up the expression.
 or  Combine like terms.
 or  Simplify.
So the solutions are  or
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Triangles/551827: How do you find the area and perimeter of a square when you are only given the diaganol length of 18meters? Thanks:] 1 solutions
Answer 359955 by jim_thompson5910(28595) on 2012-01-02 14:44:43 (Show Source):
You can put this solution on YOUR website!Hint: If the side length of the square is x, then  where d is the diagonal. So because the diagonal is 18 m, we know that d = 18 and
Once you have the side length, you can plug it into the formulas
Area:
Perimeter:
where 's' is the side length
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Inequalities/551824: What is the solution of this inequality : -3+2<-x+10 1 solutions
Answer 359953 by jim_thompson5910(28595) on 2012-01-02 14:36:50 (Show Source):
You can put this solution on YOUR website!
 Start with the given inequality.
 Combine like terms on the left side.
 Add  to both sides.
 Add  to both sides.
 Combine like terms on the right side.
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Answer:
So the solution is
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Matrices-and-determiminant/551600: I am stuck on how I'm suppose to find the determinant and use the determinant to write an expression. Can you please explain how to find the determinant. Thank you.
Matrix: 4 x
10 15
Question: Write an expression for the value of the determinant of the above matrix.
1 solutions
Answer 359952 by jim_thompson5910(28595) on 2012-01-02 14:36:17 (Show Source):
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Linear-systems/551778: Solve x^2 + x - 42=0
x= Is the answer 6? 1 solutions
Answer 359948 by jim_thompson5910(28595) on 2012-01-02 14:28:08 (Show Source):
You can put this solution on YOUR website!
 Start with the given equation.
Notice that the quadratic  is in the form of  where  ,  , and
Let's use the quadratic formula to solve for "x":
 Start with the quadratic formula
 Plug in  ,  , and
 Square  to get  .
 Multiply  to get
 Rewrite  as
 Add  to  to get
 Multiply  and  to get  .
 Take the square root of  to get  .
 or  Break up the expression.
 or  Combine like terms.
 or  Simplify.
So the solutions are  or
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Inequalities/551820: What is the solution of this inequality : -2(n+1) -3<1 1 solutions
Answer 359944 by jim_thompson5910(28595) on 2012-01-02 14:24:17 (Show Source):
You can put this solution on YOUR website!
 Start with the given inequality.
 Distribute.
 Combine like terms on the left side.
 Add  to both sides.
 Combine like terms on the right side.
 Divide both sides by  to isolate  . note: Remember, the inequality sign flips when we divide both sides by a negative number.
 Reduce.
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Answer:
So the solution is
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Probability-and-statistics/551818: How many ways can five women and two men can be seated on a chair if only three seats?
1 solutions
Answer 359942 by jim_thompson5910(28595) on 2012-01-02 14:22:48 (Show Source):
You can put this solution on YOUR website!There are 5+2 = 7 people total and P(7,3) = (7!)/(7-3)! = (7!)/(4!) = 5040/24 = 210 ways to seat all of them in 3 seats (assuming order matters).
If order doesn't matter, then there are C(7,3) = (P(7,3))/(3!) = 210/6 = 35 different ways to seat them.
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