The length of a rectangle is 6.7 more than 2 times the width. if the perimeter of the rectangle is 57.2 cm, what are its dimensions? show all work. a. length=21.3 cm; width=7.3 cm b. length=7.3 cm; width=21.3 cm c. length=21.3 cm; width=14 cm d. length=7.9 cm; width=14 cm