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1. Please check my answers to make sure they are correct. Thanks!

Algebra
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Apr 27th, 2015

(f°g)(x)=f(g(x))= 9 / ((4/x) - 5)  =  9 / ( (4 - 5x)/ x) = 9x / (4 - 5x )  because a/(b/c) = ac/b 

D={xc R / '4 - 5x =/= 0 } so :  x =/= 4/5 

 so : D= ]-infini , 4/5 [ U ] 4/5 , +infini [

you have a good answer you are perfect in maths 

so good luck 

Apr 27th, 2015

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Apr 27th, 2015
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