Because they show exactly how much of something is there/needed.
It isn't that hard to choose an answer corresponding to an area of 63 ft^2.
A: 35 ft^2
B: 63 ft^2 . . . . . perhaps this one is the correct choice, eh?
C: 99 ft^2
D: 143 ft^2
Answer:
go to algebra answers.com
Step-by-step explanation: