Solve the problem.A reflecting telescope has a parabolic mirror for which the distance from the vertex to the focus is 31 feet. If the distance across the top of the mirror is 68 inches, how deep is the mirror in the center?
A. 
in.
B. 
in.
C. 
in.
D. 
in.
Answer: C
Mathematics
You might also like to view...
Eliminate the parameter of the pair of parametric equations.x = sin t, y = 3 cos t
A. 9x2 + y2 = 9 B. 9x2 + y2 = 1 C. x2 + 9y2 = 1 D. x2 + 9y2 = 9
Mathematics
Find an equation of an ellipse satisfying the given conditions.Vertices:(±14, 0); Length of minor axis: 16
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics
Simplify the expression.-10(5x + 7) + 8(6x + 5)
A. -5x - 3 B. -2x + 7 C. -120x D. -2x - 30
Mathematics
Use l'Hospital's rule, if applicable, to find the limit.
A. 
B. 0
C. 
D. 1
Mathematics