exam Maths Puzzle Numerical Ability

Sarah has a collection of nickels, dimes, and quarters worth $15.75. She has 10 more dimes than nickels and twice as many quarters as dimes. How many coins of each kind does she have?

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Hi! Can you help me with the problem:

Write an expression for the difference of 4 and the square of a number.

I do not know whether it is 4 - n^2 or n^2 - 4

Thanks. :) the official volleyball measures 27 inches in circumference. what is the surface area?