Question 1110501
write each rational expression in lowest terms. 
m^2-25/4m -20
(m+5)(m-5)/4(m-5)= m+5/4 
What do I do now?

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You should place parenthesis so your question is definitive.

(m^2-25)/(4m-20)  appears to be the expression you want to reduce.

If so,

   {{{ (m^2-25)/(4m-20) = ((m-5)(m+5))/(4(m-5)) = (m+5)/4  }}}  

and that is as far as you can reduce it.
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( note that you may have had the same answer in mind but  m+5/4  does NOT equal (m+5)/4  )