Having trouble its easy but not for me

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

Acompany is testing in comparing to lightbulb designs the box plot shows the number of hours that each lightbulb design last before burning out which statement is best supported by the information of the plot

Two parallel lines are crossed by a transversal. what is value of x