you cant answer this dummy
step-by-step explanation:
a_n = a_1 + (n - 1)d
the first term is 6.
the common difference d = ?
when you find d, replace n with 7 and d with the common difference to find your answer.
10 - 8 = -2
8 - 6 = -2
etc, so -2 is the common difference