B the answer is b bc c and a are wrong and it wouldn’t be correct
The answer is "Math".....but technically the official name for it is Mathematics.
Step-by-step explanation:
A-B
=7x-6x/2 +10) - (-2x +6x-4)
=x/2+10- 4x+4
= x-8x /2 +14
=-7x/2+14
The correct answer is C. Randomizing the groups and calculating the means and difference of the means.