Questions › Category: Math › An airplane is flying at an altitude of 4000 feet and descends at rate of 200 feet 0 Vote Up Vote Down Lisa Howell asked 8 months ago An airplane is flying at an altitude of 4000 feet and descends at rate of 200 feet per minute. Determine whether the altitude is proportional to the number of minutes. Please login or Register to submit your answer Username or Email Address Password Remember Me