Rewrite the equation in a rotated x'y'-system without an x'y' term. Express the equation involving x' and y' in the standard form of a conic section.17x2 - 12xy + 8y2 - 68x + 24y -12 = 0
A. 
+ 
= 1
B. 
+ 
= 1
C. x'2 = -16y'
D. 
- 
= 1
Answer: A
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Determine whether the given point is in the solution set to the given system.(5, -4, 5)2x - 3y + 3z = 244x + 4y - 3z = -83x - 3y + 2z = 23
A. No B. Yes
Solve the problem.Suppose that the salinity S of ocean water at a given depth d is modeled by the equation 
where S is measured in grams salt per kilogram water and d is measured in meters. What is the salinity when the depth is 688 m? Round your answer to the nearest hundredth.
A. -29.93 g salt/kg water B. 37.87 g salt/kg water C. 94.82 g salt/kg water D. 97.62 g salt/kg water
Find the inverse of A.
a. 
b. 
c. 
d. 
Solve the problem. Round your answer to the nearest tenth of a percent, if necessary.985 is what percent of 788?
A. 125.0% B. 1.3% C. 80.0% D. 0.1%