When multiplying 15/x • x/3, is it necessary to make the restriction x ≠ 0 ? Why or why not ?

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 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.