The first 4 on the left has a value of 400. The next 4 has a value of 40. The first 4 is in the hundreds place and the second 4 is in the 10's place.
It’s a great way to write numbers that are very big numbers or very small numbers.
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D.) -20 degrees Fahrenheit because -12 degrees plus eight equals negative 20 degrees Fahrenheit
since AC is too short the answer would be
AC + CB < AB
