If n = 4, the value of the expression 28 - 12 + the square root of n ÷ 2 is?

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

Simplify using positive exponents only.

Show all work to identify the discontinuity and zero of the function f of x equals 6 x over quantity x squared minus 36