It is irrational. Otherwise sqrt(2) would be rational too which is not true.
Answer:
3.93258426966
Step-by-step explanation:
To 1 d.p = 3.9
Answer:
168 = L + 2W
And you want to maximize LW.
Which means you want to maximize W (168 - 2W), or 168W - 2W^2.
To maximize that, the derivative must go to zero.
0 = 168 - 4W, or W = 42. And L = 84. Done. :-)
Step-by-step explanation: