Please help me with the 1 question ASAP

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

To decrease an amount by 16% what single multiplier would you use

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b