Question 61836
(1a) z=4

(1b) z=0

(2a) (0,1) (1,3) (2,9) the graph should be like a half a U. once x is a negative, y just gets closer and closer to 0 but it never does.

(2b) im really sorry but i don't know what sub is unless it is the same as base. If it is then you can rewrite the equation as x=3^y.
(3,1) (9,2) (1,0). the graph will be a half of a U but on its side, opening to the right. it starts at right before (0,-1.5) and then keeps going up and to the right

(3a) 1,400,000

(3b) about 2060695 people

(3c) the rate at which the poplulation grows