Find the diameter and radius of a circle given the approximate circumference of 38 meters. (3.14 for pi) sorry for these questions but i just don’t understand them ; -;

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∣∣

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Find the value of ax 4 ; a = 2, x = 1. select one: a. 2 b. 4 c. 1 d. 8