Question

Juan has 20 books to sell. He sells the books for $15 each. The amount of money Juan makes from selling x books is represented by the function.

F(x)=15x
What is the practical range of the function?
A. All integers from 0 to 20, inclusive.
B. All multiples of 15 between 0 and 300, inclusive.
C. All real numbers.
D. All multiples of 20 between 0 to 300, inclusive.

Answer 1

Well you would multiply 20x15 to find out the highest of the range which is 300. So that knocks it down to B or D. but since they're $15 each, it would be based of the multiples of 15 making your answer B.

Answer 2

the range is all the y values....or the f(x) values

so the practical range would be the multiples of 15 between 0 and 300