Pls answer and explain, and pls do Not send me files

You and a friend race across a field to a fence and back. your friend has a 50-meter head start. the equations shown represent you and your friend's distances dd (in meters) from the fence tt seconds after the race begins. find the time at which you catch up to your friend. you: d=∣−5t+100∣d=∣−5t+100∣ your friend: d=∣−313t+50∣∣

Can someone answer this question? : )

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.