The function f(x) = 2.5x + 75 is used to model the cost of renting billboard space depending on the area, in square feet, of the billboard, x, and including a standard layout fee. The mathematical range for the function is the set of real numbers.
Answer
A
The reasonable range contains only integers.
B
The reasonable range contains only positive rational numbers.
C
The reasonable range contains only integers greater than 75.
D
The reasonable range contains only positive rational numbers greater than 75.