On a trip of d miles to another city, a truck driver's average speed was x miles per hour. On the return trip, the average speed was y miles per hour. The average speed for the round was 60 miles per hour. 30x (a) Verify that y = x - 30 Total distance Average speed = Total time 60 = (d/x) + (d/y) 60 = y + x 60y + 60x = 60X = - 60y 60x = (x - 30) 30x Ey x - 30 What is the domain? (Enter your answer using interval notation.)(b) Create a table that shows corresponding values of y (in miles per hour) for x values of 35, 45, 55, and-65 miles per hour. (Round your answers to three decimal places.) X 35 45 55 65 y (c) Find the limit of y as x approaches 30 from the right. Interpret its meaning. As x gets close to mi/h, y becomes ---Select