Look at de pic pls :)

Find the total area for the regular pyramid ( follow the answer set up in the picture)

Ateacher has $80 to buy workbooks. each work book cost $3. if she buys as many workbooks as possible, how much money does she have leftover? a) $2 b) $4 c) $6 d) $8

Find the value of x in the diagram below. select the best answer from the choices provided