Solve the problem.Find the equation for the tangent plane to the surface 
at the point 
A. x + y + z = 1
B. x + y + z = -9
C. -11x - 11y + 13z = -9
D. -11x - 11y + 13z = 1
Answer: C
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Solve the application by adding or subtracting appropriately.Trin's grocery bill was $9.53. He gave the clerk a $20 bill. How much change should he receive?
A. $9.53 B. $10.47 C. $10.46 D. $9.47
Solve.The radioactive decay of radium 226 can be described by the equation 
where C is the original amount of radium and A is the amount of radium remaining after t years. If 23 milligrams of radium are sealed in a container now, how much radium will be in the container after 100 years. Round to the nearest thousandth.
A. 22.99 mg B. 24.006 mg C. 1.194 mg D. 22.037 mg
Solve the problem.A ball is thrown downward from a window in a tall building. Its position at time t in seconds is given by 
where s is in feet. How long will it take the ball to fall 
Round to the nearest tenth, if necessary.
A. 3.6 sec B. 1.9 sec C. 2.7 sec D. 1.7 sec
Provide an appropriate response.Points represent:
A. an additional cost of financing B. monthly payments C. 2 percent of the amount borrowed D. a 3 percent up front payment