12. HELP PLEASE ASAP

Trigonometry help asap

Aswim teacher sells lesson packages. the best deal has the highest ratio of lessons to total cost. swim lesson packagesnumber of lessons total cost$10$4010 1 $8015$80which package is the best deal? l lesson for $105 lessons for $4010 lessons for $8015 lessons for $80mark this and returnsave and exit

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.