Greg has nickels and pennies in his pocket. the number of pennies is three less than twice the number of nickels. let n represent the number of nickels

The expression for the number of pennies Greg has is 2 × n - 3

The reason the above expression is correct is as follows;

Question: The part of the question that appears missing is to; Write an expression for the number of pennies

The given parameters are;

The denominations of currency Greg has in his pocket = Nickels and pennies

The number of pennies he has = 2 × The number of nickels he has  - 3

The number of nickels = n

Therefore, by plugging in the variable for the number of nickels, we have;

The expression for number of pennies = 2 × n - 3

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