Can someone please help me out with these 2.

On a piece of paper graph f(x)=5•(0.4)^x

Solve -.016x= -16. need solving this

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.