Work Shown:
[tex]a_n = a_1 + d(n-1)\\\\a_{8} = -1 + d(8-1)\\\\a_{8} = -1 + 7d\\\\41 = -1 + 7d\\\\41+1 = 7d\\\\7d = 42\\\\d = \frac{42}{7}\\\\d = 6\\\\[/tex]
