1)The manager of TeleStar Cable Service estimates that the total number of subscribers to the service in a certain city t years from now will be Find the average number of cable television subscribers over the next 5 years if this prediction holds true. 2) Evaluate the definite integral 3) Let h(x,y)= (x+y)/(x-y). Compute h(0,1), h(-1,1), h(2,1), and h(pi, -pi)