Help pls!! i have no idea what i’m doing.

Nine more than four times a number is the same as one less than twice the number. find the number?

17 in long 1.3 ft wide and 8in high what is the volume

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.