Solve the system of equations using Cramer's Rule if it is applicable. If Cramer's Rule is not applicable, say so.
A. x = 
, y = 
; 
B. x = - 
, y = - 
; 
C. x = 
, y = - 
; 
D. not applicable
Answer: C
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Match the inequality to its graph.y ? 2x
A. 
B. 
C. 
D. 
Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = (-2x - 10y)5
A. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: lines 
B. Domain: all points in the xy-plane; range: all real numbers; level curves: lines 
c ? 0
C. Domain: all points in the xy-plane; range: all real numbers; level curves: lines 
D. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: lines 
c ? 0
Use a special product formula to simplify.[(m - 9) - n][(m - 9) + n]
A. m2 - 18m + 81 - n2 B. m2 - 18m + 81 + 2mn + 18n - n2 C. m2 + 18m + 81 - n2 D. m2 + 81 - n2
Solve the problem.Suppose that the radius r and volume V = 
?r3 of a sphere are differentiable functions of t. Write an equation that relates dV/dt to dr/dt.
A. 
= 4?r2
B. 
= 4?
C. 
= 
?r2
D. 
= 3r2