Math question ? help

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

Consider the functions below. function 1 function 2 function 3 select the statement which is true about the functions over the interval [1, 2] a b function 3 has the highest average rate of change function 2 and function 3 have the same average rate of change. function and function 3 have the same average rate of change function 2 has the lowest average rate of change d.

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g