Solve the problem.A bridge is built in the shape of a semielliptical arch. It has a span of 120 feet. The height of the arch 27 feet from the center is to be 7 feet. Find the height of the arch at its center.
A. 15.56 ft
B. 7.18 ft
C. 27.19 ft
D. 7.84 ft
Answer: D
Mathematics
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and 
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, -
)
A. 
B. 
C. 
D. (
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Solve.The distance to the horizon (in miles) of a satellite h miles above Earth's surface is given by the expression 
. What is the distance to the horizon from a satellite that is 25 miles above Earth? Express the answer in radical form.
A. 20
mi
B. 250
mi
C. 25
mi
D. 10 mi
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Write the power of i as i, -1, -i, or 1.i18
A. -1 B. -i C. i D. 1
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Solve.20x - 20 > 4(4x + 4)
A. (20, ?) B. (-?, 9) C. (-?, 20) D. (9, ?)
Mathematics