Solve the problem.A railroad tunnel is shaped like half of an ellipse. The height of the tunnel at the center is 11 ft and the vertical clearance must be 9 ft at a point 20 ft from the center. Find an equation for the ellipse. 
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: D
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List the critical values of the related function. Then solve the inequality.
? 
A. -3, 3, 27; (-?, -3) ? (3, 27] B. -5, -3, 3, 27; (-5, -3) ? (3, 27] C. 27; [27, ?) D. -5, -3, 3, 27; (-?, -5) ? (-3, 3) ? [27, ?)
Combine and simplify. Write the answer as a mixed number as needed.8
- 1
+ 7
A. 14
B. 14
C. 14
D. 0
Identify the axis of symmetry of the parabola.y = 4x2 - 64x + 261
A. x = -5 B. x = 5 C. x = 0 D. x = 8
Solve. Round your answer to the nearest tenth, if necessary.An object is thrown upward from the top of a 
building with an initial velocity of 48 feet per second. The height, h, of the object after t seconds is given by the quadratic equation 
When will the object hit the ground?
A. In 5 seconds B. In 160 seconds C. In 2 seconds D. In 7 seconds