I have a few questions i need some help on. its converting (my weakest category).

1)What is the price of 1 gallon of gasoline in U.S. dollars in France? (The value of the Euro is currently $1.33 U.S. and the price of 1 liter of gasoline in France is 0.90 Euro.)

2)What is its density in pounds per cubic inch (lb/inch^3).

(The density of lead is 11.4 .)

3)How many kilometers can the Insight travel on the amount of gasoline that would fit in a soda pop can? The volume of a soda pop can is 355 .

(The Honda Insight, a hybrid electric vehicle, has an EPA gas mileage rating of 57 in the city.)

and last how do i solve for protons and neutrons if something says

, ,, etc? thxs for teh help.