Can you j the question more sorry i just cant find the comment so i used this.
The area of the circle by definition is given by:

For f (r) = 154:

Clearing r we have:

For f (r) = 616:

Clearing r we have:
Answer:
a reasonable domain for f (r) is:
7 <r <14
Answer:
im sorry
Step-by-step explanation:
i dont kno