James had 42 dollars. He bought his sister a gift that costs x dollars. How much money does james have now, in terms of x

Which statement is true about the function f(x)= square root -x ? the domain of the graph is all real numbers. the range of the graph is all real numbers. the domain of the graph is all real numbers less than or equal to 0. the range of the graph is all real numbers less than or equal to 0.