Suppose That in a Certain Biology Lab Experiment, the Number $N ( T ) = - 2 T ^ { 2 } + 240 T - 5,100 ( 40 \leq t \leq 90 )$

Multiple Choice

Suppose that in a certain biology lab experiment, the number of bacteria is related to the temperature T of the environment by the function $N ( T ) = - 2 T ^ { 2 } + 240 T - 5,100 ( 40 \leq t \leq 90 )$ Here, N(T) represents the number of bacteria present when the temperature is T degrees Fahrenheit. Also, suppose that t hr after the experiment begins, the temperature is given by $T ( t ) = 10 t + 40 ( 0 \leq t \leq 5 )$ How many bacteria are present when t = 5 hr?

A) 300
B) 900
C) 1,200
D) 400
E) 600