exam Maths Puzzle Numerical Ability

For a sample of size n =100, proportion p=0.6, and at a 95% confidence level, the upper bound of the proportion is

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i need help with finding 2x-y=5 in slope intercept form and in y-intercept form!!! Sam has $70,000 to invest and requires an overall rate of return of 10%. He can invest in a safe, government insured cerificate of deposit that pays 12%. To obtain 10%, he agrees t