Put -4 in place of x
-4 to the second power is 16 so it would be 16-(-12)= 28
0.5, you would divide 0.375 to cancel out the height and then divide 0.75 (the new volume after you divided 0.375 by the height) by 1.5 to cancel out the x
The set X = { x , {x} } would, I think, fit the Bill
So its 2 elements
The answer is
225.5 m
because if you add all the numbers up then you would get 224.5
Answer:
x = 4 or x = -3
Step-by-step explanation:

Take square both the sides,

x² - x - 12 = 0
x² - 4x + 3x - 3*4 =0
x*(x - 4) + 3*(x - 4)= 0
(x- 4 )(x+3) =0
x -4 =0 or x + 3 = 0
x = 4 or x = -3