round to the place of the underlined digit624,531463,356

Factor the monomial completely 42a3b3

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol