It takes alden 6 hours to bale all the hay in a field, but his brother, anthony , can do the same job in 7 hours. if they bale all the hay in an entire field together , approximately how long will it take them to complete the job?

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