Answer: Our required formula becomes :

Step-by-step explanation:
Since we have given that

We need to write a formula for f(b) in terms of b So, it becomes

Hence, our required formula becomes :

Answer:
I believe the answer is c because 4.5 can fit in BP almost 4 times so it is most accurate sorry if I'm wrong
90^2-54^2=5184
root 5184=72
pr=72