Answer: 48 feet
Explanation:
From the question, a row of plaques cover an area of 336 square feet of space on the wall and the plagues have a height of 7 feet, then we are told to calculate the length.
Area of the wall covered by the plaques = Length of the plaques × the width of the plaques
336 = length × 7
length = 336 ÷ 7
length = 48
Therefore, the plaques will cover 48 feet of the wall.