j0162
13.12.2019 •
Mathematics
When three-digit telephone area codes were first put in place in the united states and canada, the first number could be any digit from 2 through 9, the second number could only be 0 to 1 and the third number could be any digit from 0 through 9. how many possible area codes can be created with this format?
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Ответ:
919
Step-by-step explanation:
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Ответ:
9 = 4(3)(h)
9 = 12h
Now we cancel the 12 by dividing:
9/12 = 12h/12
3/4 = h
However, this is in feet. We must convert to inches:
3/4 (12) = 3/4(12/1) = 36/4 = 9 inches.