I need some help, if you could, tysm

How many sides does a regular polygon have if each exterior angle measures 72a.3b.4c.5d.6

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

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