I need an expression that includes 3 operations and equals a negative number. Show all work

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

The volume of a cube is 8 in to the 3rd power. how long is each side?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).