24 Mar 09
Foremost, I must say that I'm not a mathematician, nor a math professor, and neither an expert with numbers; eventhough I took up a course and graduated as an Accountancy major. I believe that Accountancy isn't totally concerned with numbers but rather, with analysis. Regarding the equations or problems you included here, I will try to share what I know about these and give my personal answers or solutions if these were given as a quiz in school. 1. a+b = -(-a-b) = True Negative variable or number multiplied by another negative variable results to a positive product. The negative sign outside of the parenthesis may be construed as -1; thus -1 multiplied by -a results to +a. Likewise, -1 multiplied by -b results to +b. In effect, the equation a+b is equal to -(-a-b). 2. 1/3 + 1/6 = 1/2 or .5 or 50% 1/3 + 1/6 = First, we find for the common denominator, which is 12. Twelve divided by 3 equals 4. Further, 12 divided by 6 equals 2. We add 4 & 2 to get 6/12. We convert this to its lowest form and we get 1/2. I do hope my analysis and memory on computing these equations still functions well.