Please help I don’t know the answers

Typically a point in a three dimensional cartesian coordinate system is represented by which of the following answers in the picture !

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

How many significant figures are there in the number 10.76?