Aschool administrator selects every 20th person on the list of names alphabetically to see what the favorite school subject is. is this biased?

Classify the polygon by its number of sides. state whether the polygon appears to be regular or not regular. a.heptagon, regular b. heptagon, not regular c. octagon, regular d. octagon, not regular

What is the product? (x2+3y+7) [yy+1)

What is the slope of the line that contains the points (-2,1) and (0,-3)