Im not sure what to do here or how to start for ap calculus

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

How long does it take natsumi to clean up after she is done? table: .area time30. 245. 2.7560. 3.5

If sin(x) = 0 and cos(x) = 1, what is tan(x)?