A parachute design uses 18 separate pieces of rope. Each piece of rope must be at least 270 centimeters
and no more than 280 centimeters long. What
inequality represents all possible values of the total
length of rope x, in centimeters, needed for the
parachute?

a) 270< x <280
b) 4,860< x <4,870
c)4,860< x <5,040
d) 5,030< x <5,040