interval notion of c(x)=25x/100-x

Question

find the restricted domain written in interval notion

Answer 1

I am going to ASSUME that the function has numerator 25x, and its ENTIRE denominator is (100 - x), which SHOULD BE PARENTHESIZED to obtain correct order of operations.

 

This function is not defined if x = 100; otherwise, Ok everywhere else.

 

So the domain is (-infinity, 100) ∪ (100, +infinity)