Anyone good at explaining synthetic division?

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

Three times the sum of a number and seven is negative thirty-six. what is the number?

How does reflecting or rotating a figure change the interior angles of the figure?