#### Answer

a) 4 ft
b) The surface area increases by a multiple of 4 to 384$ft^2$.

#### Work Step by Step

a)
surface area = 96 $ft^2$
$A = 2*wh+2*wl+2*hl$
$96 = 6*s^2$
$96/6 = 6*s^2/6$
$16 = s^2$
$\sqrt {16} = \sqrt {s^2}$
$s = 4$
b)
$A = 2*wh+2*wl+2*hl$
$A = 2*8*8+2*8*8+2*8*8$
$A = 128*3$
$A = 384$