exam Maths Puzzle Numerical Ability

3x-4y=8;(-6,5)

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exam Other Question

There are 2 copy machines. One can do a printing job in 75 minutes. If both machines print at the same time they can do the printing job in 50 minutes. How long will it take the other machine to do the printing job by itself. A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin biased towards heads? Show your decision rule and calculations. (b) Calculate a p-value and interpret it?