Area of semicircle = 1/2 the area of a circle:

radius is half the diameter of 6ft.

Area of the rectangle:

Add the two together:
90 + 14.13 = 104.13
Round to the nearest tenth (one decimal place)
Area = 104.1 square feet.
Hope this helps but try to do process of elimination.
I think it should also be 16 but I’m not pretty sure so hopefully you get it right !