If you have two drums and 4 flutes write ratio as a fraction in simplest form
2 answers:
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Start on -7 since it is the y intercept(b). 4/1 is the slope. So from seven you would go up 4 right 1.
Use a= 
r^2 (r represents your radius of 4 feet)
(4^2)
Answer = 16^2
Answer = 16