Which is equal to 10^12/10^-3

Which part of a 2-column proof is the hypothesis of the conjecture? a) given b) reasons c) prove d) statements ! i think it's b but i'm not quite

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate.true or false?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?