Question

BRINLEST WIL BE GIVIN

Answer 1

`\huge\boxed{-0.001a^(n+1)}`

Explanation:

`-0.001a^(3n+3)=-0.001a^(3(n+1))=(-0.001a^(n+1))^3\\\\\text{Used}\\\\a(b+c)=ab+ac\qquad\text{distributive property}\\\\(a^n)^m=a^(n\cdot m)`