I need help on this?

If g^-1(x) is the inverse of g (x) which statement must be true

Mike wants to make meatloaf. his recipe uses a total of 8 pounds of meat. if he uses a 3 to 1 ratio of beef to pork, how much pork will he use? enter your answer as a mixed number in simplest terms.

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)