Complete the square in x and y to find a Cartesian equation of the form 
or 
for the given equation.9x2 - 16y2 + 36x - 64y - 172 = 0
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
Answer: C
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Find Dxy.y = (2 - 2x) tanh-1 x
A. 
- 2 tanh-1 x
B. 
- 2 tanh-1 x
C. 
D. 
- 2 tanh-1 x
Solve the problem.Find the moment of inertia about the z-axis of a thick-walled right circular cylinder bounded on the inside by the cylinder r = 1, on the outside by the cylinder r = 5, and on the top and bottom by the planes 
A. 624? B. 1250? C. 2496? D. 1248?
Solve the problem.Mark has $75 to spend on salmon at $5.00 per pound and/or chicken at $3.00 per pound. If he buys s pounds of salmon and c pounds of chicken, the equation 5s + 3c = 75 must be satisfied. How much salmon did Mark buy if he bought 5 pounds of chicken?
A. 17 lb B. 19 lb C. 12 lb D. 16 lb
Solve the inequality and write the solution set in interval notation.ln x ? 2
A. (-?, 2] B. [0, e2) C. (-?, 2) D. (0, e2)