exam Maths Puzzle Numerical Ability

For a sample of size n=60, proportion p=0.35, and 95% confidence level, the lower bound of the proportion is ______?

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Can I get some help with this word problem?

A square has sides of length 3x - 2cm. Express the area of the square as a polynomial.

Thank you for your time. Could you please help me solve the following equation by using the square root method? 9x^2-30x+25=-1

Thank you very much for any help you can provide.