With the growing popularity of cell phones, a local phone company had a sharp decline in the number of customers with land-line phones in their homes. Suppose land-line phones are decreasing at a rate of 27% each year since 2000. Assume that there were 10,000 subscribers with land-line phones in the year 2000.

For convenience lett= the number of years after 2000 andy= number of subscribers with land-line phones.

A formula that models this scenario is:

a.y = 2000 (0.73)^t

b.y = 10,000 (0.73)^t

c.y = 10,000 (1.27)^t

d.y = 10,000 (0.27)^t