Hi can someone help me with these question ASAP. Thanks. Will mark as brainliest ! Show working out too

20 da is equal to a. 2,000 cm. b. 2 m. c. 20,000 cm. d. 20,000 mm

An airport in death valley is 60 feet below sea level, and an airplane is flying 2,000 feet above sea level. how many feet must the plane descend in order to land? a. 2060 b. 2000 feet c. 1940 feet d. 1880 feet e.1400 feet will mark as brainliest

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.