Mrs. smith bought pencils and spiral notebooks for her class. when she bought 60 pencils and 30 spiral notebooks, the cost was $33. when she bought 10 pencils and 20 spiral notebooks, the cost was $19. what is the price of 1 spiral notebook? what is the price of one pencil?

10a^3+277a^2-132a-792

step-by-step explanation:

(2a+11)(5a-12)(foil)

=10a^2-24a+55a-132 =10a^2+31a-132

(10a^2+31a-132)(a+6)

=10a^3+60a^2+31a^2+186a^2-132a-792 =10a^3+277a^2-132a-792

i hope this is what you are looking for : )

no not all of them.

step-by-step explanation:

some of them have a square base.

25

step-by-step explanation:

both equations and proportions are better.