# algebra 2

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how many 7-digit phone numbers are possible if the first digit must be non-zero? answer in scientific notation.

• algebra 2 -

9*10*10*10*10*10*10
9*10^6

• algebra 2 -

Write (1.8x10^-12) (2.1x10^-3)

• algebra 2 -

Write (1.8x10^-12) (2.1x10^-3) in scientific notation

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can someone correct this for me parts A-E and if i am wrong can you help me....please How many 7-digit telephone numbers are possible if the first digit cannot be zero and..... a) only odd digits may be used?
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Since when is 5^7 =8125? if a number is a multple of ten, that means the last digit is zero. The leading digit cannot be zero. 9*10^5*1 on c, again, the leading digit cannot be zero. d is right e. no leading zero is allowed. 9*9*8*7*6*5*4=
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