What number is half way between thirty and thirty one

What is the vertex form of f(x) = x2 + 6x + 3

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)