What does point a represent on the graph?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Describe a situation that you could represent with the inequality x< 17

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