exam Maths Puzzle Numerical Ability

I greatly need your help in solving another statistics problem, please? Thanking you in advance for your assistance in this matter!
A coin was flipped 60 times and came up heads 3

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exam Other Question
How do you solve (x+b)(x-b)=x(x-5) for x? I would like to see every step and it would be nice if you could explain why you did each step. Thank you very much. please help me find the inverse of this equation- 2x=5/6