If you can give me a thorough answer, you'll have my eternal love and respect: "Temba is standing in the lunch line 6.4 x 106 m from the center of Earth. Earth’s mass is 6 x 1024 kg. a) What is the acceleration due to gravity? b) When Temba eats his lunch and his mass increases, does this change the acceleration due to gravity?"

I know it has something to do with the gravitational acceleration formula, but I'm only given one mass (and the formula calls for two).