A= π(r)^2 so it would be A= π(7x7) and so A= π(49). Hope it helps :-)
The answer is 100 if you do it step-by-step
The statement "y varies directly as x," means that when x increases, y increases by the same factor. In other words, y and x always have the same ratio: y/x =K
it can be written as ---> y=kx
then put in the values to get a common ratio
k= y/x
k1= 11/7
k2= 13/8
therefore, there's no common ratio in the given table
Try this option, modify design according to local requirements.
