GUYS HELP ME ITS URGENT ..

What’s the domain of this function? fastttt

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

Which equation is y = -6x2 + 3x + 2 rewritten in vertex form?