# SOLUTION: all numbers undefined for 2/4x+5 Divide and Simplify 5/t divided by 10/t Subtract and simplify 13/d-8 - 13/8-d add and simplify 7/15r + 4/9r

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 Question 195874: all numbers undefined for 2/4x+5 Divide and Simplify 5/t divided by 10/t Subtract and simplify 13/d-8 - 13/8-d add and simplify 7/15r + 4/9rAnswer by Alan3354(34677)   (Show Source): You can put this solution on YOUR website!all numbers undefined for 2/4x+5 Is that a question? ------------------- Divide and Simplify 5/t divided by 10/t Multiply extremes and means - NUM = extremes = 5t DEN = means = 10t 5t/10 = 1/2 ----------- Subtract and simplify 13/d-8 - 13/8-d (d-8) = -(8-d) --> 13/(d-8) + 13/(d-8) = 26/(d-8) Use parentheses. That could be (13/d) - 8 - (13/8) - d, an entirely different problem. ----------------- add and simplify 7/15r + 4/9r In class, they harp on the LCD for this type of problem, finding it, using it, etc. You can multiply to the 2 DENs and use that, it will always work. You have to reduce the results, anyway. Don't waste time on a test finding the LEAST common denominator, just find A common denominator (unless the problem asks for the LCD). 7/15r + 4/9r Common DEN = 135r (no need to use r^2) =63/135r + 60/135r = 123/135r = 41/45r