12k-2+6k
find like terms and put them next to each other
12k+6k-2
combine like terms
18k-2
C
Answer:

Step-by-step explanation:
See comment for complete question
Given:


Required
The information that shows
by SSS
By SSS implies that, the three sides of both triangles are congruent
Already, we have:


The third side of
is 
The third side of
is 
So, for both to be congruent by SSS, the third sides must be congruent
i.e.

Is there a picture of the shape, and is 4x - 2 AC or AB?
Answer:
C
Step-by-step explanation:
I got the answer C because if the estimated value of the tank is 50 and it gets drained it will only have 18 gallon in it
Step-by-step explanation:
We can prove the statement is false by proof of contradiction:
We know that cos0° = 1 and cos90° = 0.
Let A = 0° and B = 90°.
Left-Hand Side:
cos(A + B) = cos(0° + 90°) = cos90° = 0.
Right-Hand Side:
cos(A) + cos(B) = cos(0°) + cos(90°)
= 1 + 0 = 1.
Since LHS =/= RHS, by proof of contradiction,
the statement is false.