The answer I got to this was 2.3 but I don't know if that's correct.
I think that it would be C, but I am debating on C and D. I'm pretty confident that it's C, though. Pretty sure.
F(x) = 2 * 2 ^x
f(-2) = 2 * 2^-2
f = 0.5
11.5 x 3.2 = 36.8m
-36.8 meters change in elevation
Let the four numbers be A,B,C,D in ascending order.
The key is in conditions 2 & 3.
B-C=-4, and B+C=0
therefore B=-2, C=2 by solving the two previous equations.
Given that the product of the two greatest numbers is 6, we have C*D=6, or
D=6/C=6/2=3
Now since the sum of all the four numbers is -6, we have
A+B+C+D=-6
A-2+2+3=-6
A=-6+2-2-3=-9
Check: we were told smallest divided by greatest = A/D=-9/3=-3 ok.
So the numbers are
A=-9, B=-2, C=2, D=3.
