1. a.

b. k = 0.4 and A = 600

c. Using y = 600e0.4x. when x = 9, then y = 21 959

2.

a.

A = 2800

k = -0.2

 

b. Between 8 and 9 months.

3. a. From the graph pressure at ground level is approximately 992

b. Let ln P = mx + c

P = emx+c

so P = emx.ec = kemx where k = ec (a constant)

c. When x = 0, then P = k, so k = pressure at ground level.

d. m = − 0.16