Solve the problem.A searchlight is shaped like a parabola. If the light source is located 3 feet from the base along the axis of symmetry and the opening is 8 feet across, how deep should the searchlight be?
A. 4 ft
B. 1.3 ft
C. 5.3 ft
D. 0.6 ft
Answer: B
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Find the standard-form equation of the ellipse centered at the origin and satisfying the given conditions.An ellipse with vertices (±8, 0) and foci at (±3, 0)
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Solve.(x - 1)2 = -16
A. 1 ± 4i B. 4i + 1 C. 4i D. 1 ± 4
Solve the problem.The amount of alcohol in the bloodstream, A, declines at a rate proportional to the amount, that is, 
. If 
for a particular person, how long will it take for his alcohol concentration to decrease from 0.10% to 0.05%? Give your answer to the nearest tenth of an hour.
A. 0.2 hr B. 4.6 hr C. 2.3 hr D. 3.5 hr
A pair of similar triangles is shown. Find the measure of the segment marked with the letter x.
A. x = 12 B. x = 7 C. x = 21 D. x = 28