Answer:
Step-by-step explanation:
-4 = 5 + f....we want to isolate f, so subtract 5 from both sides
-4 - 5 = 5 - 5 + f
-9 = f <===
Your answer
212960
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r≈97.95
r=C
2π=615.44
2·π≈97.95032
Answer: 86pi
