How do you describe the sequence 7,14,21,28

The first term, a is 7.

The next term is increased by adding 7.

The sequence is an Arithmetic Sequence.

The common difference d = 14 - 7 = 21 - 14 = 7

For Arithmetic, an = a + (n - 1) d

The nth term = 7 + (n - 1) 7 = 7 + 7 (n - 1)

= 7 + 7n - 7 = 7n

= 7n