# How do you simplify \frac { - 13a ^ { 4} } { 39a ^ { 12} }?

$- \frac{1}{3 {a}^{8}}$
1.$- \frac{13}{39}$=$- \frac{1}{3}$
2.${a}^{4} / {a}^{12}$ = ${a}^{4 - 12}$ = $\frac{1}{a} ^ 8$
3.ANSWER: $- \frac{1}{3 {a}^{8}}$