Can some one help me plz

Which formula gives the area of a triangle? a=1/2(b+h)

Name these type of angles shown check all that applies

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)