What are the total amount of choices possible if an individual is to create a 4 digit password using the digits 0 through 9 inclusive, but not using the digit 0 as the first character of the password?

The first digit has 9 choices, since it can be 1 through 9 but not 0. Each of the remaining three digits can be any of the 10 digits, 0 through 9. Thus there are 9 × 10 × 10 × 10 = 9,000 possible passwords, so the correct choice is D, 9,000.

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