Which function has an inverse that is also a function? O {(-4, 3), (-2, 7), (–1, 0), (4, –3), (11, –7)} O {(-4, 6), (-2, 2), (–1, 6), (4, 2), (11, 2)} O {-4, 5), (-2, 9), (-1, 8), (4, 8), (11, 4)} O {(-4, 4), (-2, -1), (-1, 0), - (4, 1), (11, 1)}

Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).

Can someone me out here number 4 plz

Apassenger train and a freight train leave san jose at 3pm, traveling in the same direction. the passenger train is going three times as fast as the freight train. at 6pm they are 240 miles apart. how fast is each travelling? explain your answer and show your