MODELING WITH MATHEMATICS The population P

(in thousands) of Austin, Texas, during a recent decade

can be approximated by y where t is the number of years since the beginning of the decade.

a. Tell whether the model represents exponential growth or exponential decay.

b. Identify the annual percent increase or decrease in population.

In Exercises 4144, use the given information to find

the amount in the account earning compound interest

after 6 years when the principal is $3500.

r = 2.16%, compounded quarterly

r = 2.29%, compounded monthly

r = 1.83%, compounded daily

r = 1.26%, compounded monthly