Work Step by Step
$a_1=-0.7,~~a_2=-13.8$ $d=a_2-a_1=-13.8-(-0.7)=-13.8+0.7=-13.1$ $a_n=a_1+(n-1)d$ $a_8=-0.7+(8-1)(-13.1)=-0.7+(7)(-13.1)=-92.4$
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