Ayuda por favor es para hoy y nose que hacer​

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∣∣

Write two subtraction equations that are equivalent to 5 + 12 = 17.

What are the soultion(s) to the quadratic equation 40- x^2=0