Answer
$-60$
Work Step by Step
To find the $n$th term of an arithmetic sequence, we use the formula $a_n = a_1 + (n-1)d$ where $a_1$ is the first term and $d$ is the common difference.
$a_{15} = -4 + (15-1)\cdot(-4) = -4 +14\cdot(-4) = -4 +(-56) = -60$
