Solve each system by substitution NEED THIS ASAP

Angela rode his bike around a bike trail that was 1/4 of a mile long he rode his bike around the trail 8 * angelo says he wrote a total of 8/4 miles to russell says he's wrong and he actually and says that he actually wrote to my who is corrupt use words and trying to explain how you know.

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

Angle that produces maximum distance