3-4 Arithmetic Sequences

Find the common difference in the sequence: 10, 3, -4, -11, ... : -7

Find the common difference in the sequence: 11, 9, 7, 5, ... : -2

Find the common difference in the sequence: 6n, 8n, 10n, ... : 2n

Find the common difference in the sequence: 50p, 100p, 150p, ... : 50p