3x + 9x simplified pls

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∣∣

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

Write the expression in complete factored form. 5n_(c - 3) - n(c - 3) =