
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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March 20th, 2012, 08:23 PM  #1 
Newbie Joined: Feb 2012 Posts: 9 Thanks: 0  I have many problems (refreshing) MID TERM TOMORROW
2(4x +2) = 8 Show 4/12 is equivalent to 1/3 7/35  4/5 = Blank/5 Really confused. Denominator should equal when subtracting fractions. How is the listed answer use denominator of 5? 1/4x = 3 (1/4 x 12 = 3 doing math in my head, but how do you show it?) x = 12 right? 3(2x + 3) = 6x  4 
March 20th, 2012, 09:01 PM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs  Re: I have many problems (refreshing) MID TERM TOMORROW
1.) Factor a 2 from within the parentheses: Divide through by 4: Subtract 1 from both sides: Divide through by 2: 2.) 3.) We may reduce the first term: so now the expression is: So 3 goes in the blank. 4.) Multiply through by 4: 5.) On the left distribute the 3: Subtract 6x from both sides: This is false, so there is no solution to the equation. The geometric interpretation is trying to find the point of intersection of two separate parallel lines. 

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