In parallelogram ABCD, what is BDC?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Find the slope of the line passing through a pair of points

Cody started biking to the park traveling 15 mph, after some time the bike got a flat so cody walked the rest of the way, traveling 4 mph. if the total trip to the park took 6 hours and it was 46 miles away, how long did cody travel at each speed? solve using rate times time= distance