Well 8x25x23 = 4,600 but what do you need to subtract by?
(5.)
13x + 5 = 83
-5 -5
13x =78
/13 /13
x = 6
(9.)
0.7 , 0.9 , 1.6 , 2.3 , 2.5
median = 1.6
Since all the sides of a cube are the same length, then to find the volume just use the volume formula
v = length x width x height
v = 5 1/3 x 5 1/3 x 5 1/3
v = (16/3)^3
v = 4096/27
v = 151.70 inches^3
You should get a positive number