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Which expression represents half the sum of n and 7 ?

Alicense plate is to consist of 44 digits followed by 55 uppercase letters. determine the number of different license plates possible if the first and second digits must be? odd, and repetition is not permitted.

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

What is the difference between the equations of a vertical and a horizontal line?