Question

For the F + G domain, does it start at the beginning of G or when F and G are together?

Answer 1

The domain of a function is the set of all the points (or x values) where the function exists.

The graph of the function f only exists for values of x between 2 and 11 (both inclusive), thus the domain of f is [2,11].

The function g exists only for values of x between 1 and 9, thus the domain of g is [1,9].

The function f + g exists only where f exists AND g exists. Thus, the domain of f + g is [2,9]