Use algebra tiles to find the difference. let one yellow tile equal +1 and one red tile equal –1. 11 – 12 a. -23 b. -1 c. 23 d. -3

So you have 11 yellow tiles and 12 red tiles. Each yellow tile can be canceled out by a red tile. If you take 11 of each tile, you'll end up with one red tile, or -1. B is your answer

what are the events? you didnt list any

q1: artillery

q2: simon bolivar

q3:   their workers and farmers demanded a return to spanish rule.

q4: drafted new constitutions

q5: oligarchies have replaced monarchies