Let U ={x|xeZx2<20}.If A={-4,-2,0,2,4} then verify the following. (i) A U A=A
(ii) A n A = A
(iii)A U A'=U
(iv)A n A'=cardinal number

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

Analyze how limestone is weathered and identify the features that are formed as a result of this dissolution

Upon decomposition, one sample of magnesium fluoride produced 1.65 kg of magnesium and 2.56 kg of fluorine. a second sample produced 1.32 kg of magnesium. part a how much fluorine (in grams) did the second sample produce?