The perimeter of a rectangle is 42 inches. If the width of the rectangle is 6 inches, what is the length? A. 12 inches B. 15 inches C. 21 inches D. 40 inches

Answer: 15 InchesStep-by-step explanation:Remember that the Perimeter of a rectangle is the distance around it.So,     Perimeter = Length + Width + Length + Width or      P = 2L + 2W If P=42 inches and W = 6 inches,     42 = 2L + 2(6)     42 = 2L + 12     30 = 2L              [subtract 12 from both sides]     15 = L               [divide both sides by 2] The length (L) is 15 inches.