20. Determine whether each sequence below is arithmetic, geometric, or neither. Provide support (4 points) for your conclusions. sequence 1: sequence 2: 21. A large asteroid crashed into a moon of another planet causing several boulders from the moon to be propelled into space toward the planet. Astronomers were able to measure the speed of one of the projectiles. The distance (in feet) that the projectile traveled each second, starting with the first second, was given by the arithmetic progression 18, 54, 90,126, Find the distance that the projectile traveled in the eighth second. 234 ft. 270 ft. 288 ft. 306 ft. 22. Calculate 324 for the arithmetic sequence in which (113 = 1.9 and the common difference is d = 3.7. 42.5 42.6 59.4 1.2 (I point) (I point) (n+1)! (1 point) 23. Determine the first four terms of the sequence in which the nth term is a, = ( n + 2 ) ! O O GUN- al- Ul WINN- WI-NH AWN| - A/- WIZ O O