You used the fact that you can multiply both sides of an equality by the same, non-zero constant.
So, if you start with the trivial equality
you can multiply both sides by 3:

But if
,
becomes
, which is
. So, we have

which leads to

if you recall that 
B. The diagonals bisect each other.
The value of tan x when cos x= 1/2 is; √3
<h3>Right-angled triangles</h3>
From Trigonometric identities of right Triangles;
It follows that;
Hence, the opposite of angle X is;
Hence, it follows that tan x;
Hence, the value of tan x = √3.
Read more on right triangles;
brainly.com/question/20087965
I f x is not divisible by 2 then x is not divisible by 4.
Its choice C.
They are not equal if thats the question
-4(x+3) = -4x-12
1/3(18x+36)-10x =-4x+12
one has -12 and the other has +12