#### Answer

$1. a^{-4}\times a^{3}$
$2.\frac{a^{3}}{a^{4}}$
$3.\frac{1}{a}$

#### Work Step by Step

1. You are given the equation a^-4 x a^3
2. Take x^n if n is negative then x^n=1/x^-n
3. So in this case x=a and n=-4 therefore a^-4=1/a^-(-4
4. After the negatives cancel a^-4=1/a^4
5.Then multiply 1/a^4 and a^3
6. Cancel as
7. And you are left with the final answer, 1/a