exam Maths Puzzle Numerical Ability

Please i need help with this problem:

The cost of 63 inches of ribbon at 12 cents per yard is?

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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? 1) In what fundamental way does the solution set of a system of linear equations differ from the solution set of a system of linear inequalities? Please give examples and the impor