Which ratios form a proportion?
4/10and 10/25
3/5and 9/25
4/11 and 6/13
4/9 and 9/4

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

The width of a rectangle is 20 units. can the perimeter p of the rectangle be 64 units when its length x is 11 units? no, because p = 2x + 2(20) no, because p ≠ 2x + 2(20) yes, because p ≠ 2x + 2(20) yes, because p = 2x + 2(20)

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 : )