Answer:
The answer I got was 301.44
Answer:
Yes there is, and it is 4.99.
Step-by-step explanation:
The constant of proportionality (let's call it
) will relate the number of books bought
and their cost
in the following way:


For the 12 books:

And for the 21 books:

The
for the two purchases is the same, thus there is a constant of proportionality between the two purchases.
P.S:
is the price per book.
Answer:
12in
Step-by-step explanation:
12x3=36
36-4=32
12+32=44