What's the square root of 5

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

Which graph represents the given linear function 4x+2y=3

During the election for class president, 40% of the students voted for kellen, and 60% of the students voted for robbie. 500 students voted in total. how many more students voted for robbie than for kellen? answer with work : )