Homework Help: Algebra 1:Problem Solving

Posted by Thea on Sunday, October 4, 2009 at 7:07pm.

How many different seven-digit telephone numbers are available if the only restriction is that the first digit can't be 0? Is there a formula for this to make it simpler? Then I'll solve this problem myself.

Algebra 1:Problem Solving - Reiny, Sunday, October 4, 2009 at 7:12pm
there are 9 ways to fill the first place

there are 10 ways to fill the second place, so far we have 9x10

there are 10 ways to fill the third place, so far we 9x10x10

etc.

Answer this Question

Related Questions

algebra - How many different seven digit phone numbers are available if the only...
Math. Explain - From the digits 1, 2, 3, and 4, how many positive integers are ...
math - The number uses every number 0-9 the numbers are used only once the ...
Math - A warranty identification number for a certain product consists of a ...
Math- Problem solving - A number has 4 digits. The digit in the hundredths place...
4th grade - i am a 5 digit number my tens digit is the sum of my hundreds digit ...
Math - i am a four digit number. all of my digits are different. my first digit ...
math - How many Seven-Digit numbers less than 1,048,000 can be using the digits ...
Math - How many seven digit numbers less than 1.048,000 can be made using the ...
Math - How many seven-digit numbers less than 1,048,000 can be made using the ...

For Further Reading

First Name:
School Subject:
Answer: