400,300,150,75,22.5 is it geometric or arithmetic

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

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