Asked by mychelle

how many 7-digit phone numbers are possible if the first digit must be non-zero? answer in scientific notation.
Answered by Damon
9*10*10*10*10*10*10
9*10^6
Answered by Anonymous
Write (1.8x10^-12) (2.1x10^-3)
Answered by Samantha
Write (1.8x10^-12) (2.1x10^-3) in scientific notation