Answer please n thank you :)

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∣∣

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

Which expression converts 45 degree to radians