Please help me I will make brailest

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?

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

Atruck can be rented from company a $50 a day plus $0.60 per mile. company b charges $20 a day plus $0.80 per mile to rent the same truck. find the number of miles in a day at which the rental costs for company a and company b are the same