Thank you for the opportunity to help you with your question!
Hey I will provide the best answers for you , But there are so many questions and $1 is not worth doing this much
so I will explain 1st question
if x> 2 then x^2 - x -6 / x^2 -4
first x^2 -4 = (x+2) (x-2) [ based on formula (a+b) (a-b) = a^2 - b^2 ]
and x^2 - x -6 = x^2 -3x +2x +6
= x(x-3) +2 (x+3)
= (x+2) (x -3)
so if x> 2 then x^2 - x -6 / x^2 -4 = [ (x+2) (x-3) ] / [ (x+2) (x-2) ]
= x - 3 / x -2 ------->B
2). 4 - (-6) / -5 = 4 + 6 / -5 = 10 / -5 = -2 --->D
post other question separatly
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