B) Rotterdam. Because sea level is 0 and Rotterdam is the only one below sea level
U set ST and SR equal
7x + 24 = 115
7x = 91
x = 13
4 pounds. if you divide the number of pounds by gallons you get the amount of pounds per gallon. 8 divided by 2 is 4.
I can't really help you with what is in your house......
