Please help me I do not understand this

That’s a trapezoid. To find the area of a trapezoid, you take the 2 bases (9ft and 14ft) and add them up (23ft). Then divide the sum of the 2 bases by 2 (23/2=11.5). Then you take that and multiply it by the height (7ft). So 11.5(7)=80.5ft^2.
Formula for area of trapezoid:
a+b/2•h
a=base 1. b=base 2. h=height

 C. 8.16 x 60.29

Step-by-step explanation:

8.16 x 60.29 = 491.9664

When you round the nearest tenth which is 9, it'll be estimated to a 10. The numbers would then be 492.0 which is a overestimate.