Would i add the exponents with z to the fourth power?

Restrictions on f(x) = 1/x+5 and g(x) = x-2

Find the equation using the point (4,8)

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