Adding Rational Expressions

Question

9/xy^3+m - 7ap/xy^3m=

x/3+c/y+4/z=

Answer 1

On your first question, is the denominator of the second term
xy^3m or xy^3+m ?
It makes a big difference.

For your second question, form a common denominator, 3xz, and combine the numerators. This results in
(xyz + 3cz + 12y)/3yz

Answer 2

these are the solutions for the 2 questions

Answer 3

I don't know if you are providing solutions or questions. Anyway, my previous comments still apply.