Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
-A rocket is shot straight up in the air from the ground at a rate of 80 feet per second. The rocket is tracked by a range finder that is 431 feet from the launch pad. Let $d$ represent the distance from the rocket to the range finder and t represent the time, in seconds, since "blastoff". Express $\mathrm { d }$ as a function of $t$

A) $\mathrm { d } ( \mathrm { t } ) = 431 ^ { 2 } + ( 80 \mathrm { t } ) ^ { 2 }$
B) $\mathrm { d } ( \mathrm { t } ) = \sqrt { 80 ^ { 2 } + ( 431 \mathrm { t } ) ^ { 2 } }$
C) $\mathrm { d } ( \mathrm { t } ) = 431 + 80 \mathrm { t } ^ { 2 }$
D) $d ( t ) = \sqrt { 431 ^ { 2 } + ( 80 t ) ^ { 2 } }$