exam Maths Puzzle Numerical Ability

16^x-4=3^3-x

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find to the nearest degree, all values in the interval 0 degress is less than/equal to X which is less than/equal to 360 degrees, that satisfy the equation 3cos^2x=1+2cos x A coin was flipped 60 times and came up heads 38 times. (a) at the .10 level of significance, is the coin biased toward heards? Show your decision rule and calculations. (b) Calculate a p-value and interpret it.