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Answer:
104 inches
Step-by-step explanation:
perimeter = 2*width + 2*length
length = width + 84
perimeter = 208 = 2*width + 2*(width+84) = 2*width + 2*width +2*84
208 = 2*width + 2*width + 2*84
208 = 4*width + 168
subtract 168 from both sides to isolate the width and coefficient
40 = 4*width
divide both sides by 4 to get width
width = 10
length = width+84 = 94
length and width added together = 10+94 = 104