What is the role of the part in the diagram labeled X?
O modulate, amplify, and send out waves
O capture, amplify, and demodulate waves
o change the amplitude and frequency of waves
change the pulse and phase of waves

An astronaut on the moon throws a baseball upward. the asatronaut is 6ft, 6in. tall, and the initial velocity of the ball is 30ft per second. the heigh s of the ball in feet is given by the equation s = -2.7^2 + 30t + 6.5, where t is the number of seconds after the ball was thrown. after how many seconds is the ball 16ft above the moon's surface?