10. City A has a population of 3 million at t = 0, where t is measured in years, and doubles every 10 years. City B has a population of 8 million at t = 0 and is decreasing at a rate 6% per year. (a) Find the formula for the population A(t) of City A (in millions of people) as a function of time t (in years). (b) Find the formula for the population for the population 305) of City B (in million of people) as a function of time t (in years). (c) When are the populations of the two cities equal? 9. Evaluate the following expressions without using a calculator. (a) sin-1 (1) (b) sin -1 3 TT sin 4 (c) cos sin -1 COIN8. Let f(x) =x2 -2x, x