At 45° latitude, the gravitational acceleration as a function of elevation z above sea level is given by g = a - bz, where a = 9.807 m/s^2 and b = 3.32 X 10 ^-6 s^-2. Decide the weight of an 80k person at sea level (z=0), in Denver (z=1610m), and on the top of Mount Everest (z=8848m).