This is due today and I don't understand it. Please do both of them.

Each of the walls of a room with square dimensions has been built with two pieces of sheetrock, a smaller one and a larger one. the length of all the smaller ones is the same and is stored in the variable small. similarly, the length of all the larger ones is the same and is stored in the variable large. write a single expression whose value is the total area of this room. do not use any method invocations.

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)