Solve the problem.A bridge is built in the shape of a semielliptical arch. It has a span of 102 feet. The height of the arch 30 feet from the center is to be 9 feet. Find the height of the arch at its center.
A. 11.13 feet
B. 30.48 feet
C. 15.3 feet
D. 9.42 feet
Answer: A
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Solve the equation exactly in the complex number system.x3 + 125 = 0
A. x = -5, x = 
+ 
, x = - 
- 
B. x = 5, x = 
± 
C. x = - 
, x = 
± 
D. x = -5, x = 
± 
Find the domain of the rational expression. 
A. {x|x is a real number and x ? 8} B. {x|x is a real number and x ? 8 and x ? 1} C. {x|x is a real number} D. {x|x is a real number and x ? -8}
Use the given conditions to write an equation for the line in slope-intercept form.Slope = -3, passing through (7, 4)
A. y - 4 = -3x - 7 B. y - 4 = x - 7 C. y = -3x + 25 D. y = -3x - 25
Solve the problem.A boy is flying a model airplane while standing on a straight line. The plane, at the end of a twenty-five foot wire, flies in circles around the boy. The directed distance of the plane from the straight line is found to be d = 25 cos 
where d is measured in feet and t is the time in seconds. If d > 0, the plane is in front of the boy; if d < 0, the plane is behind him. What is the amplitude? What is the period? Graph d over two periods beginning at t = 0. 
What will be an ideal response?