Simplify (3 + 2i) - (5 - 4i)

Evaluate 4 a for a = 5 2/3 . express your answer in simplest form.

When turned about its axis of rotation, which shape could have created this three-dimensional object?

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 : )