Find A-1 if it exists.A = 
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Solve.A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 45 ft and the vertical clearance must be 30 ft at a point 5 ft from the center. Find an equation for the ellipse.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics
Provide an appropriate response.The graph of y = (x10)x has two horizontal tangent lines. Find equations for both of them.
A. y = e1/e and y = e-1/e B. y = e10e and y = e-10e C. y = e5/e and y = e-5/e D. y = e10/e and y = e-10/e
Mathematics
Provide an appropriate response.Let A = 
. Find A-1.
What will be an ideal response?
Mathematics
Translate the percent problem to a proportion using x for the unknown value. Do not solve the proportion.What is 148% of 91?
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Mathematics