can someone please help and explain the question?

40 A craftsman named William Barnes builds two kinds of birdhouses, one for wrens and a second for bluebirds. Each wren birdhouse takes 4 hours of labor and 4 units of lumber. Each bluebird house requires 2 hours of labor and 12 units of lumber. The craftsman has available 72 hours of labor and 120 units of lumber. Wren houses yield a profit of $10 each and bluebird houses yield a profit of $15 each 36- 32- 28 The aim of the objective function for William should be to Maximize the objective value. 24- >20- 16- Decision variables: X = number of wren houses to be produced Y = number of bluebird houses to be produced a) Objective function: 2= x+y Subject to: 4X + 2Y 72 (C1) 4X + 12Y 120 (C2) 12- 4- C1 c2 12 16 24 28 32 36 40 20 X X,Y 20 b) On the graph on right constraints C, and Cy have been plotted. Using the point drawing tool, plot all the corner points for the feasible area. The optimum solution is: X= (round your response to two decimal places). Y=(round your response to two decimal places). Optimal solution value 'Z' =(round your response to two decimal places)