Anybody know this? Please only answer if you know.

Ineed with number 17 i don’t get it at alll

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

"princess tower" in dubai is considered the world's tallest residential building, towering to 1 0 1 101 floors! t ( n ) t(n) models the number of tenants living on floor n n of the tower. what does the statement t ( 2 0 ) = t ( c ) t(20)=t(c) mean?