I would really appreciate some help, please!
 The graph shows the distance, y, in miles, of a moving motorboat from an island for a certain amount of time, x, in hours:
 What is the speed of the motorboat? (5 points)
 Select one:
 a. 198 miles per hour
 b. 22 miles per hour
 c. 44 miles per hour
 d. 66 miles per hour