I dont understand this question it says "what is the domain of f(x)=x+7"

How can we find the measure of an exterior angle if we know the measurement of an interior angle

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

The table below represents a linear function f(x) and the equation represents a function g(x): x f(x) −1 −5 0 −1 1 3 g(x) g(x) = 2x − 7 part a: write a sentence to compare the slope of the two functions and show the steps you used to determine the slope of f(x) and g(x). (6 points) part b: which function has a greater y-intercept? justify your answer. (4 points)