Each question would be worth about 2.22 points.
It is CONSTANT if the graph is of a horizontal line.
It is LINEAR if the graph is of a line that is not horizontal.
It is NONLINEAR if it is a function that is neither linear nor constant.
Question 5 and 6 are the same.
I would say less than because 4 multiplied by a number is less than 9 multiplied by a number.