Answer:the arithmetic sequence has a common difference = d = 4 an- an-1 = 4
Step-by-step explanation:a4 = 3d + a1 = 3(4) + 7 = 12+7 = 19
an = (n-1)d + a1
IF you had wanted a23,
a23 = 22(4) +7 = 88+7 = 95
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