Right to expressions for 45 minus n

Plzzz asapppppp what is the inverse of f if f(x)=^3 sqrt x-5

If n stands for number sold and c stands for cost per item, in which column would you use the formula: ? a. column d c. column f b. column e d. column g

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)