What is the value of 3^ -2 as a fraction

Football player weighed 170 2/3 pounds in may. during the summer he gained 25 5/12 pounds. during the first week of fall practice he lost 10 1/4 pounds and during the second week he lost another 3 1/2 ponds. how much does he weigh at this point? a.182 1/3ib b.181 1/2ib c.182 5/12ib d.183 2/3ib

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Having a hard time understanding this question (see attachment).