Convert 3400 into a standard form

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

How can you find the magnitude of a vector, v = < x,y > , where the horizontal change is x and the vertical change is y?

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)