A rocket is shot straight up in the air from the ground at arate of 51 feet per

A rocket is shot straight up in the air from the ground at arate of 51 feet per second. The rocket is tracked by a rangefinderthat is 494 feet from the launch pad. Let d represent the distancefrom the rocket to the rangefinder and t represent the time inseconds since blastoff. Express d as a function of t.