In class we examined the pressure, temperature and density variations in the lower 11km of the atmosphere (troposphere), assuming that the temperature drops linearly with altitude with a rate of -0.0065 k/m. from 11 to 20 km altitude, in the tropopause, the us standard atmosphere assumes the temperature to be constant. a) derive an expression for the variation of the atmospheric pressure with altitude h over the 11 to 25 km range, if the acceleration of gravity is constant. b) using the values of temperature and pressure at h=11km from the model used in the troposphere as new reference values for the tropopause, determine the pressure, temperature and density at 19 km altitude.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant. 

Im here for points, sorry i dont have the answer ; /