Streak, color, luster, crystal structure.
You would draw a table like the above ^
And you would input each x value (1,2,3,0,-1,-2,-3) into the equation one by one for the value of both x and y
I did the first one for you so you understand how to do it.
It's C. The removal of water from aquifers.
$11.77/11 = $1.07
6*1.07 = $6.42
Therefore the answer is C.
I believe the percentage living in Western Russia (the European part) is 78%