Please help I really need it now!!!

What term makes it inconsistent y=2x - 4

1jessica's home town is a mid-sized city experiencing a decline in population. the following graph models the estimated population if the decline continues at the same rate. select the most appropriate unit for the measure of time that the graph represents. a. years b. hours c. days d. weeks

Which is f(5) for the function –2x2 + 2x - 3?