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?

919

Step-by-step explanation:

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+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x

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step-by-step explanation: