Simplify the expression. , i want to make sure i do it right

a) 90x

b) 6x√5

c) 5x√6

d) 6√5x^2

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.