Astudent runs 100 meters in 11 seconds. what is the speed of the student? 9.1 miles per hour 16miles per hour 20.3miles per hour 24miles per hour

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