Question 269521
Simplify if possible 
(i) {{{(t^2+3t-18) / (t^2+12t+36)}}}
first we factor the numerator and denominator to get
(ii) {{{((t+6)(t-3)) / ((t+6)(t+6))}}}
next we cancel the t+6 binomial to get
(iii) {{{(t-3) / (t+6)}}}
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Mult. and Simplify if possible
BC 5d^3
--- * -----
d^5 10c^5 
not sure on this one??? 
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Mult. and Simp. if possible.
{{{(x^2-12x+20)/(x^7)}}} *  {{{5x/(x-10)}}}
factor all parts that you can to get
{{{((x-2)(x-10))/(x^7)}}} *  {{{5x/(x-10)}}}
cancel x-10 binomial and then an x to get
{{{(x-2)/(x^6)}}} *  {{{5}}}
answer is
{{{(5x-10)/x^6}}}