calculus
posted by HelpPlease help!!!! .
for the given functions f&g, find the following and state the domain of each result.
f(x)= 5x+4/7x8; g(x)= 2x/7x8
a. (f+g)(x)=?
what is the domain?
b. (f/g)(x)=?
what is the domain?

A). (7x+ 4)/(7x8)
Domain is all except x can not equal 8/7 because it will make the denominator equal to 0
B). ( 5x + 4)/ 2x
Domain all except x can not equal 0