A school library is planning to add a reference section to their collection. (Business)
The library can add no more than 20 books, and the librarian decided that the school could use a maximum of 16 dictionaries and a maximum of 9 thesauruses. Dictionaries cost $15, and thesauruses cost $10. List the three constraints (not including x > or = 0 and y > or = 0.)
a) 16x + 9y ≤ 20
b) 15x + 10y ≤ 20
c) 16x + 9y ≤ 25
d) 15x + 10y ≤ 25