exam Maths Puzzle Numerical Ability

(x-1)^2=7

x^2-9x-4=6

4x^2-8x=3=5

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exam Other Question

5y2+6y+1 In order to use the test statistic for the difference between two sample means both samples must have a population of at least 30 and the samples must be from dependent populations. Is this answer true or false?