Solve the problem.A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 15 ft and the vertical clearance must be 9 ft at a point 16 ft from the center. Find an equation for the ellipse.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: D
Mathematics
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Solve.|3x - 8| = -2
A. 
B. 
C. 
D. ?
Mathematics
Answer the question.What does the digit 2 mean in the number 189,247?
A. 2 thousands B. 2 tens C. 2 hundred thousands D. 2 hundreds
Mathematics
Evaluate the expression for the given replacement values. Write the answer in simplest form.
for x = 
, y = 
, z = 
A. 
B. 
C. 
D. 
Mathematics
A supply duct is to run the perimeter of a building having a length four times the width. The total duct length is 750 ft. What are the dimensions of the building?Length: __________ ftWidth: __________ ft
What will be an ideal response?
Mathematics