solve these questions for javascript

1- We can replace the declaration let x = 3e-3; with?

2- Examine the following code:

let x = mult (2) (10);

console. log (x); / / -> 20

so what should the mult function declaration look like if the execution of this code results in a value of 20 in the console?

3- Examine the following code:

let a = (n) => {

return n > 2 ? n * a(n - 1) : 2

}

a (6);

so what will appear on the console as a result?