Question 612919
P = 2L + 2W


845 = 2(W+2) + 2W


845 = 2W+4 + 2W


845 = 4W+4


845-4 = 4W


841 = 4W


841/4 = W


W = 841/4


Now that you know W, use it to find L


Remember that L = W+2