Step-by-step explanation:
Cost of paperback books = $1x = $x
Cost of hardcover books = $2y
Given Greg can spend a MAXIMUM of $20,
Cost of Paperback books + Cost of hardcover books must be at most 20.
Inequality of this situation =

For this answer it is:
12 inches = 36 feet
36 units
Hope this helps u hon :)
I don’t know the answer to these questions sorry bro