Final answer:
The first four terms in the sequence 6[3-n] are 12, 6, 0, and -6.
Step-by-step explanation:
The given expression is 6[3-n]. To find the first four terms in the sequence, we substitute different values for n.
When n = 1, we have 6[3-1] = 6[2] = 12.
When n = 2, we have 6[3-2] = 6[1] = 6.
When n = 3, we have 6[3-3] = 6[0] = 0.
When n = 4, we have 6[3-4] = 6[-1] = -6.