I need help no ilnks please and thank you

How can we find the measure of an exterior angle if we know the measurement of an interior angle

What is 32+4 x (16 x 1/2) -2 show your work}

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?