exam Maths Puzzle Numerical Ability

My teacher is not very good at explaining the lessons to me.
I do not get the concept of dividing exponents.
PLEASE HELP ME!

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exam Other Question

one number is 4 less than 3 times a second number. if 3 more than twice the first number is decreased by twice the second, the result is 11. I need help writing a formula for: The sum S of the measures of angles in a polygon of n sides.