Solve the problem.State whether the vectors v = 2i + j and w = i - 2j are orthogonal.
A. orthogonal
B. not orthogonal
Answer: A
Mathematics
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Solve the problem.If m?x = 38° in the following figure, find the measures of ?w, ?y, and ?z. 
A. m?z = 38°, m?w = m?y = 142° B. m?z = 38°, m?w = m?y = 52° C. m?z = 52°, m?w = m?y = 142° D. m?z = 142°, m?w = m?y = 38°
Mathematics
Simplify.
A. 
B. 
C. 
D. 
Mathematics
Use order of operations to simplify the expression.[-20.6 + (16.6 - 3.9)] - 2.1
A. -10 B. -5.8 C. -39 D. 31.2
Mathematics
Solve.A swimmer swims the 200m backstroke in 2.22839 minutes. Round her time to the nearest hundredth.
A. 2.23 minutes B. 2.22 minutes C. 2.24 minutes D. 2.228 minutes
Mathematics