Final answer:
The first four terms of the sequence defined by the recursive formula 2+y-1 are 2, 1, 2, 1.
Step-by-step explanation:
The recursive formula for the sequence is defined as ai = 2 + yi-1, where ai represents the ith term of the sequence. We can find the first four terms of the sequence by substituting the values of y in the formula.
When i = 1, y1 = 0. Plugging these values into the formula, we get a1 = 2 + 0 = 2.
When i = 2, y2 = -1. Plugging these values into the formula, we get a2 = 2 + (-1) = 1.
When i = 3, y3 = 0. Plugging these values into the formula, we get a3 = 2 + 0 = 2.
When i = 4, y4 = -1. Plugging these values into the formula, we get a4 = 2 + (-1) = 1.