Donald needs to stamp 145 pieces of mail. he has finished 97 pieces. how many more does he have to do? a. 58 b. 48 c. 42 d. 52

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 : )

1. if events a and b are non-overlapping events, how do you find the probability that one or the other occurs? 2. what does it mean if p(a or b) equals 1?

Change negative exponents to positive. then solve. round to four decimal places