In the first half of a trivia game, paco scored 400 points. then, during the second half, he lost 100 points. what was his total score?

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 : )

The ratio of the perimeters of two similar triangles is 4: 3. what are the areas of these triangles if the sum of their areas is 130cm2?

How can you find the magnitude of a vector, v = < x,y > , where the horizontal change is x and the vertical change is y?