Simplify the expression using the imaginary unit i.
A. -7i
B. 7i
C. i
D. ±7
Answer: B
Mathematics
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Find the center and radius of the conic.
?
?
A. Center: 
Radius: 
B. Center:
Radius: 
C. Center: (0,0)
Radius: 
D. Center:
Radius: 
E. Center:
Radius: 
Mathematics
Find the sum.
 figure 1.png)
Mathematics
Solve.A water tank can be filled in 5 minutes and emptied in 9 minutes. If the drain is accidentally left open when the tank is being filled, how long does it take to fill the tank?
A. 4 min B. 20 min C. 11.25 min D. 28 min
Mathematics
Find the equation of the tangent plane (or tangent "hyperplane" for a function of three variables) at the given point p.f(x, y) = 
, p = (1, -1, -5).
A. 10x + 10y + z = -5 B. x + y + 5z = -5 C. 5x + 5y + z = -10 D. 5x + 5y + z = -5
Mathematics