Solve the Problem $\frac { 841 } { 1200 } \mathrm { in }$

Multiple Choice

Solve the problem.
-A reflecting telescope has a parabolic mirror for which the distance from the vertex to the focus is 25 feet. If the distance across the top of the mirror is 58 inches, how deep is the mirror in the center?

A) $\frac { 841 } { 1200 } \mathrm { in }$ .
B) $\frac { 841 } { 100 } \mathrm { in }$ .
C) $\frac { 841 } { 14400 }$ in.
D) $\frac { 625 } { 116 } \mathrm { in }$ .