A building contractor is to dig a foundation \( 42 \) feet long, \( 24 \) feet wide, and \( 9 \) feet deep. The contractor pays \( \$ 25 \) per load for trucks to remove the dirt. Each truck holds \( 8 \) cubic yards. What is the cost to the contractor to have all the dirt hauled away?
The cost to the contractor is \( \$ \square \) .
28,350
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 \( 40 \% \) ?
