Write the expression as a pure imaginary number.
A. -2
i
B. -2
C. 2
i
D. 2
Answer: C
Mathematics
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Find the flux of the curl of field F through the shell S.F = -6yi + 2zj - 2xk; S: r(r, ?) = r cos ?i + r sin ?j + (25 - r2)k, 0 ? r ? 5 and 0 ? ? ? 2?
A. 150? B. 30? C. -150? D. 150
Mathematics
Graph.y = - 
A. 
B. 
C. 
D. 
Mathematics
Evaluate the determinant.
A. -18 B. -420 C. 420 D. -16
Mathematics
Find an equation of the parabola described.Focus at (-3, 0); directrix the line x = 3
A. y2 = 12x B. y2 = -12x C. y2 = -3x D. x2 = -12y
Mathematics