Round 6,873.493 to the nearest tenth:

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

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.