Choose all the statements that are true about this sequence. 60, 66, 72, 78
1: the value of the first term is 1.
2: this is an arithmetic sequence.
3: the value of the third term is 72.
4: the sequence starts at 60 and adds 4 repeatedly.
5: the sequence starts at 66 and adds 6 repeatedly.
6: there are four terms in this sequence.
7: the sequence starts at 60 and adds 6 repeatedly.