Are -1/2, 3/4 and -1.5 rational numbers if not what are they?

Plz which expression is equivalent to the expression below?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Juanita wade's new car has an msrp of $28,902.11 including title and processing fees. the premier package which includes surround sound and dvd player costs three times the amount of the in-style package which includes leather seats and select wheels. the total cost of her new car was $34,290.08 which included the 6.5% sales tax. find the cost of the premier package to the nearest cent.