Solve the problem.A railroad tunnel is shaped like a semiellipse. The height of the tunnel at the center is 35 ft and the vertical clearance must be 21 ft at a point 8 ft from the center. Find an equation for the ellipse. 
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: A
Mathematics
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A. 73.5 B. 0.33 C. 84 D. 12
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List all the factors of the number.42
A. 1, 2, 3, 6, 7, 14, 21, 42 B. 1, 7, 6, 42 C. 7, 6, 14, 42 D. 1, 2, 3, 6, 7, 14, 28, 42
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Factor the GCF from the polynomial.-4x3 - 8x2 + 4x
A. -4x(x2 - 2x + 1) B. -4x(x2 + 2x - 1) C. -4x(x2 + 2x) D. -x(4x2 + 8x - 4)
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Write the inequality using interval notation. Graph the inequality.-4 ? x ? 0
A. (-4, 0]
B. (-4, 0)
C. [-4, 0)
D. [-4, 0]
Mathematics