Answer:
91
Explanation:
Each term is 8 more than the last, so you can write the terms of the sequence until you get there:
11, 19, 27, 35, 43, 51, 59, 67, 75, 83, 91
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Or, you can use the formula for the general term of an arithmetic sequence. You have first term a1=11 and common difference d=8.
an = a1 +d(n -1)
a11 = 11 + 8(11 -1) = 11 + 80
a11 = 91