exam Maths Puzzle Numerical Ability

what is x+y

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exam Other Question

let s be the set of all real numbers except -1. define * on s by a*b=a+b+ab.
a)show that * gives a binary operation on s.
B)show that (s,*) is a group.
c) find the solution of the equation 2*x*3=7 in s. 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?