Nana bought 12 books for $28.50. What was the unit price?

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

2.5 milligrams is equivalent to how many grams

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2