Which postulate or theorem proves that △cfe and △dfe are congruent? a. hl congruence theorem b. sas congruence postulate c. sss congruence postulate d. aas congruence theorem

Can any one me with the answers to these questions asap?

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)

What is the product? a-3/15a × 5/a-3