Answer:
1.24 kilograms per cubic meter.
Step-by-step explanation:
If we call the number x, we can write an equation to solve:
6(x - 4) = 12
6 × x = 6x
6 × -4 = -24
So you get 6x - 24 = 12
6x - 24 = 12
+ 24
6x = 12
÷ 6
x = 2
And your final answer is 2, I hope this helps!
Is there a question here? I can't see it!
This is equivalent to finding a function g in which

.
We simply reverse the actions of the initial function by adding 81 back and taking the square root. Therefore,

.