8: The population of bacteria in a lab sample after \( n \) hours is modeled by the function \( f ( n ) = 50 ( 3 ) ^ { ( n - 1 ) } \) . How many bacteria are in the population after \( 6 \) hours?
A. \( 6,250 \)
B. \( 10,800 \)
C. \( 12,150 \)
D. \( 36,450\)
c. 12,150
Joe earns \( \$ 9 \) per hour. He worked \( x \) hours on both Wednesday and Friday, and \( 8 \) hours on both Tuesday and Saturday. Write an expression to represent how much Joe earned.
If a virus spreads at a rate that can be modeled by the exponential function \( A ( t ) = ae ^ { r t } \) , how many people will be infected after \( 5 \) days if initially \( 3 \) people are infected and the growth rate is \( 40 \% \) ?
