What are the intervals of increase and decrease in the following graph? 15 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

I’m still confused on how to work the percentages

What is the value of p in the equation y^ = -4x?