exam Maths Puzzle Numerical Ability

Suppose that Math 103 scores are normally distributed and they have a mean of 80 and a standard deviation of 6.
A) Find the Math 103 Score two standard deviations above the mean.
B)What percent of all scores is greater than 92?

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36 times one-sixth squared plus 36 times one-sizth minus 9 squared David has collected $6.50 in nickels and dimes. If she has 75 coins, how many of each coin does she have?