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Solve integer equations, determine remainders of powers, and much more with the power of Modular Arithmetic.

How many days after January 13th is February 13th?

**Note:** January has 31 days.

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If January 13 is a Monday, what day of the week is February 13?

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If May 13 is a Friday, what day of the week (during the same year) is April 13?

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If a non-leap year begins on a Monday, will it have a Friday the 13th?

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If July 13 is a Friday, is August 13 a Friday?

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