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Escaped convict total displacement vector to due east; correct number of significant figures when the following masses are added together

An escaped convict runs 1.70 km due east of the prison. He then runs due north to a friend's house. If the magnitude of the convict's total displacement vector is 2.50 km, what is the direction of his total displacement vector with respect to due east?

A. 43° south of east
B. 47° north of east
C. 56° north of east
D. 34° south of east
E. 34° north of east

Which one of the following answers would give the correct number of significant figures when the following masses are added together: 3.6 kg, 113 kg, and 4.19 kg?

A. 121 kg
B. 120.8 kg
C. 120.79 kg
D. 1.20 à? 102 kg
E. 120.8 à? 103 kg

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