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My little sister, Savannah, is three years old. she has a piggy bank that she wants to fill. She started with five pennies and each day when I come home from school she is excited when I give her three pennies left over from my lunch money. Create a mathematical model for the number of pennies in the piggy bank on day n
where p = the number of pennies Savannah has and n = the number of days that have passed.
This model works because each day, Savannah gets three pennies, shown in the equation as "3n." The "+ 5" at the beginning is there because the problem states that Savannah starts with 5 pennies.
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