Find the measure of the missing angle(s).
a = 42?
A. 128°
B. 133°
C. 148°
D. 138°
Answer: D
Mathematics
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The position vector of a particle is r(t). Find the requested vector.The velocity at t = 4 for r(t) = (8t2 + 2t + 9)i - 2t3j + (2 - t2)k
A. v(4) = 62i - 96j - 8k B. v(4) = 66i - 96j - 8k C. v(4) = 34i - 32j - 4k D. v(4) = 66i + 96j + 8k
Mathematics
Solve the system of equations using Gaussian elimination or Gauss-Jordan elimination.4x + 4y - 4z = -2116x + 17y - 15z = -78x + 9y - 7z = 12
A. 
B. 
C. 
D. No solution
Mathematics
Find the mean.39, 47, 27, 43, 24
A. 36 B. None C. 39 D. 30
Mathematics
Find the foci of the ellipse whose equation is given.
+ 
= 1
A. foci at (4, -2 - 
) and (4, -2 + 
)
B. foci at (-2, 3 - 
) and (-2, 3 + 
)
C. foci at (3, -2 - 
) and (3, -2 + 
)
D. foci at (-3, -2 - 
) and (-3, -2 + 
)
Mathematics