Which type of bias does the following situation refer to? "A high school student surveyed all the students in the cafeteria during her spare." A) Age
B) Self selection
C) convenience
D) economic
E) Cultural

Pranza plotted point a in the coordinate plane below.

Find the missing dimension extra points

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 : )