exam Maths Puzzle Numerical Ability

pre-algebra: 4! - 4^2 - 4 = ?

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Please help me. I am new to this class. Thank you for your kind assistance.

Biting an unpopped kernel of popcorn hurts! As an experiment, a self-confessed connoisseur of
che solve the system of equations using the echelon method.
5x-3y=-1
2x-7y=17