Very simple question about faker.random in javascript... newbie question

I am very newbie in javascript!

I want to be professional in javscript!

I am shame to ask this question, but I cannot find anything about it :(

(faker.random.number(89999999) + 10000000)

If I am using this faker, what numbers will be generated?

And If I want to generate numbers from 10000000 to 80000000 with faker.random.number

What code will it be?

Thank you!

Sorry for very stupid qeustion.