## College Algebra 7th Edition

$a_n=-0.7-0.2(n-1)$ $a_{10} = -2.5$
RECALL: The $n^{th}$ term $a_n$ of an arithmetic sequence can be found using the formula: $a_n = a + d(n-1)$ where $a$ = first term $d$ = common difference $n$ = term number The given arithmetic sequence has $a=-0.7$ and $d=-0.2$. This means that the $n^{th}$ term of the sequence is given by the formula: $a_n = -0.7 + (-0.2)(n-1) \\a_n=-0.7-0.2(n-1)$ Thus, the 10th term of the sequence is: $a_{10} = -0.7-0.2(10-1) \\a_{10}=-0.7-0.2(9) \\a_{10} = -0.7-1.8 \\a_{10} = -2.5$