What number must be added to the expression below to complete the square? x^2+7x

Marcus built a model car that is 4 inches wide. what scale was used to build the car if the actual width of the car is 6 feet? a. 1 in. = 2 ftb. 1 in. = 2.5 ftc. 1 in. = 1.5 ftd. 1 ft = 1.5 in.

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

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