Question 675413
P = 2L + 2W


W = 19


P >= 524


2L + 2W >= 524


2L + 2(19) >= 524


2L + 38 >= 524


2L >= 524 - 38


2L >= 486


L >= 486/2


L >= 243


So if the perimeter is at least 524 cm, then the length is at least 243 cm.