How do I solve this problem?

Which graph shows a function with a range of all real numbers greater than or equal to -1

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∣∣

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?