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 a function.

http://prntscr.com/diao9f

Answer 1

20 books max can be sold, so the top boundary is 20

Answer 2

But it's also possible that he doesn't sell ANY, so lower boundary is 0

Answer 3

A) is a range (a really weird one),
B) is impossible,
C) hmm
D) is a range

Answer 4

So it's C?

Answer 5

I think so.
No idea what A is going on about but it looks similar to a range set

Answer 6

Because there is no 20 in the function. It's 15x.