It took 5.5 hours to drive 154 miles. what was the average rate of speed? a) 14 mph b) 28 mph c) 31 mph d) 56 mph

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