2/5n+7=12 please go step by step

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

Find the values of the variables in the kite

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?