Help at least before 1

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

Simplify using positive exponents only.

Use pascal's triangle to find the missing values. x4 - 4xb + 6x2 - ax + 1