If a x b = 2a - 3b + ab, then 3 x 5+5 x 3 is equal to?

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?

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