3 + 12c - 4c
What is the answer I need help?

Cam bought some used books for $4.95. he paid $0.50 each for some books and $0.35 each for the others. he bought fewer than 8 books at each price. how many books did cam buy?

What are the domain and range of the function f(x)=2^x+1

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).