What is the factor of dialation

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

Determine the relationship of ab and cd given the following points

Plz ( true - false) all triangles have interior angles whose measure sum to 90.