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. Question 11 B 2 pts 01 (D Details Let a ={;' 1, 2 it: and E =. Find a - b. . Question 12

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. Question 11 B 2 pts 01 (D Details Let a ={;' 1, 2 it: and E =. Find a - b. . Question 12 B 4 pts 01 (D Details A 21-ft Ladder leans against a building so that the angle between the ground and the ladder is 77". How high does the ladder reach an the building? I it

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