Calculate the slope of the line given the points (-2, 6) and (0, 4)

Question and answers are in the attached picture. you so much in advance.

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)

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