Find the area of the figure below by first finding the areas of the rectangle and triangle

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.

Could somebody me with this radical simplification?