Amicrowave is placed on top of two boxes. one box is 4 feet 2 inches tall, the other box is 3 feet 5 inches tall, and the microwave is 2feet 7 inches tall. how tall are they combined?

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )