What theorem can be used to prove that the two triangle are congruent

If the measure of xyz is 81 what is the measure of yz

Julie goes to the sports store and spends $40.50 before tax. she buys a pair of shorts for $21.75 and 3 pairs of socks that each cost the same amount. how much does each pair of socks cost? $$

An octagonal prism has jow many lateral faces?