Evaluate the expression for the given replacement values.x - y
for x = -3, y = -21
A. 24
B. -24
C. -18
D. 18
Answer: D
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 
A. Domain: all points in the xy-plane; range: all real numbers; level curves: ellipses 
B. Domain: all points in the xy-plane except (0, 0); range: all real numbers; level curves: ellipses 
C. Domain: all points in the xy-plane; range: real numbers > 0; level curves: ellipses 
D. Domain: all points in the xy-plane except (0, 0); range: real numbers > 0; level curves: ellipses 
Find the center (h, k) and radius r of the circle with the given equation. 4x2 + 4y2 - 12x + 16y - 5 = 0
A. (h, k) = (- 
, 2); r= 
B. (h, k) = (
, -2); r = 
C. (h, k) = (
, -2); r = 
D. (h, k) = (- 
, 2); r = 
Solve the initial value problem.
= x cos (5x2), y(0) = 9
A. y = 
sin(5x2) + 9
B. y = sin (5x2) + 9
C. y = 
sin (u)
D. y = 
sin(5x2) + 9
Find the exact value by using a half-angle identity.cos 
A. 
B. - 
C. 
D. - 
