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Which is an equation for the nth terms of the sequence 12,15,18,21

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area

Select the correct answer from each drop-down menu. the length of a rectangle is 5 inches more than its width. the area of the rectangle is 50 square inches. the quadratic equation that represents this situation is the length of the rectangle is inches.