How many seven-digit telephone numbers are possible if the first digit must be nonzero?

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How many international direct-dialing numbers are possible if each number consists of a four-digit area code (the first digit of which must be nonzero) and a number of the type described in part (a)?

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Question

How many seven-digit telephone numbers are possible if the first digit must be nonzero?
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How many international direct-dialing numbers are possible if each number consists of a four-digit area code (the first digit of which must be nonzero) and a number of the type described in part (a)?
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__________

Quizplus · Accepted Answer

The Answer of How many seven-digit telephone numbers are possible if the first digit must be nonzero?
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__________
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How many international direct-dialing numbers are possible if each number consists of a four-digit area code (the first digit of which must be nonzero) and a number of the type described in part (a)?
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__________

How Many Seven-Digit Telephone Numbers Are Possible If the First