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Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion


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March 20th, 2012, 08:23 PM   #1
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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
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March 20th, 2012, 09:01 PM   #2
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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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