20" x 30" x4"
75 2'x4'=8' squared 20'x 30'= 600' squared 600/8=75
X4.
10/x3 = 10 x-3d/dx(10x-3) = -30 x-4 = -30/x4
1
(x4 - 3)(x4 + 3)
1817 litres
sqrt(x4) = x4/2 = x2
264
x times x times x times x = x4
(x2 + y2)(x + y)(x - y) = x4 - y4.
It is x4 + 11x3 + 41x2 + 61x + 30.