A teacher decides to survey the students in her classes to find out their opinion on the new menu in the cafeteria. Identify the population and the sample. Give a reason why the sample could be biased.

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

Isabel graphed the following system of equations. 2x – y = 6 y = -3x + 4 she came up with the solution (2,-2). what were the 3 steps she did to get that solution? (make sure they are in the correct order)

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.