Decide whether or not each equation represents a proportional relationship. a. the remaining length (l) of 120-inch rope after x inches have been cut off: 120−x=l b. the total cost (t) after 8% sales tax is added to an item's price (p): 1.08p=t c. the number of marbles each sister gets (x) when m marbles are shared equally among four sisters: x=m4 d. the volume (v) of a rectangular prism whose height is 12 cm and base is a square with side lengths s cm: v=12s2 problem 3