Divide.
A. 14
B. -14
C. -16
D. 16
E. 19
Answer: D
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Find dy/dx by implicit differentiation.xy + x + y = x2y2
A. 
B. 
C. 
D. 
Translate the sentence into a mathematical equation. Be sure to identify the meaning of all symbols.The surface area of a sphere is 4? times the square of the radius.
A. If S represents the surface area and r the radius, then S = 4?r2. B. If S represents the surface area and r the radius, then 4?S =r2. C. If S represents the surface area and r the radius, then S = 4?r. D. If S represents the surface area and r the radius, then S = ?r2.
Solve the system by the substitution method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. {(3, 1)} B. {(3, 0)} C. no solution; ? D. {(2, 1)}
Find the foci of the hyperbola.y2 - x2 = -200
A. (10, 0) and (-10, 0)
B. (
, 0) and (-
, 0)
C. (20, 0) and (-20, 0)
D. (0, 20) and (0, -20)