Written as a rate by my​

Someone answer this check out the image!

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

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!