### Instruction: Simplify $(1)(2a)(3a^2)(4a^3)(5a^4)$.### Response: Ok first let's multiply 1 by 2a.
That is 2a.
Now let's multiply 2a by 3a^2.
That is 6a^3.
Now let's multiply 6a^3 by 4a^3.
That is 24a^6.
Now let's multiply 24a^6 by 5a^4.
That is 120a^10.