The answer definitely is either B or C, because x=-4 not sure how to read your first equation. whatever the equation is, plug x=-4 in the first equation to find the value of y to see it is -8 or 4 I assume it is y-2=x-6, then the answer would be B. I could be wrong.
The option that expresses the age of tree in scientific notation with the lowest level of precision would be A. 3 X 10 to the 3rd power. As it contains the fewest number of significant figures.
