You can't at standard temperature and pressure. Minimum temperature needed is about 130 F and it would take about 20 minutes at that.
Abigail and Spencer are correct, Lauren is incorrect.
A. Always because imagine a line where one is y=x and the other is y=-x+1. The point of intersection would be (1,1)
1 gallon is equal to 16 cups.
Since Chase made 2 gallons of soup, multiply 16 x 2.
Chase made 32 cups of soup.
If he served 15 cups of soup to his guests, he will have 17 cups of soup left over, because 32 - 15 = 17.