Answer:
-3
Step-by-step explanation:
To find:
The value of '?' in the following expression:

Solution:
First of all, let us have a look at a few rules of the exponents:


Let us apply these rules and try to find out the missing value ('?') in the given expression.
Left Hand Side (LHS):

Now, let us compare the LHS with RHS, we get:

Dividing with
on both sides:

Therefore, the missing value in the expression is <em>-3.</em>
BC/DC = 8/3.2 = 2.5
AB/BD = 12.5/5 = 2.5
AC/BC = 20/8 = 2.5
Since the results are all 2.5, this means that the triangles are similar triangles.
The justification you would use is the SSS similarity theorem.
SSS = side side side
Choice A because it is statistical and the other doesn’t make sense