Solve by completing the square.x2 - 4x - 15 = 0
A. x = 4 ± 
B. x = 2 ± 
C. x = -2 ± 
D. x = 2 ± 
Answer: D
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Solve.On a cloudy day, Luciane needed to know the height of a window in a building. Luciane positioned a mirror on the ground between herself and the building so that when she looked in the mirror, she saw the window. If the mirror was 22.59 cm from her feet and 34 m from the base of the building and Luciane's eye was 1.87 m above the ground, how high up on the building was the window located? Round to the nearest unit.
A. 281 m B. 124 m C. 1 m D. 3 m
Provide an appropriate response.Find the indicated part of triangle ABC. Round to the nearest 0.1°. Find A if c = 13 m and a = 7 m. 
A. 11.0° B. 57.4° C. 32.6° D. 0.6°
Find the probability of the event.A bag contains 3 red marbles, 8 blue marbles, and 7 green marbles. What is the probability of choosing a blue marble when one marble is drawn?
A. 
B. 
C. 
D. 
Solve the rational inequality and graph the solution set on a real number line. 
> 0
A. (0, ?)
B. (-2, 0]
C. (-?, -2] ? [0, ?)
D. (-?, -2) ? (0, ?)