Help mey, please :)

Which graph represents the function f (x) = 2 x Over x squared minus 1?

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z

Divide reduce the answer to lowest term 3/7 divided 1 1/6