You have the following equation for model the amount of money raised by selling concessions related to the number of fans:
y = 5.2x - 20
The previous equation has the form of a line y =mx + b, where m is the unit rate of change and b a constant value.
The first sentence is true because in the given situation m = 5.2 and it is the unit rate of change.
The second sentence is false because the constant -20 is independent of the number of fans.
The third sentence is true because if no fans are attended, then x=0 and
y = 5.2*0 - 20
y = -20
that is, there is a loss of money.
