What is the angle between the vector 10+2 and the positive direction of the x-axis? Round your answer to one decimal place if necessary о 11.3° 30° 60° 78.7° ○ 45° Find the sum of the vectors (-1, 3, -1) and <-8, 9, 8). <-7, 6.9) (-9, 12, 7) (9,-12, -7) <4, 17, 7> (7.-6.-9)

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