Diego has 4 times as many autographed baseballs as melanie has. diego has 24 autographed baseballs. how many autographed baseballs does melanie have?

I’m stuck on this equation, anyone got the answer?

Which graph has a rate of change of zero

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 : )