What is the total cost of hardware and software if hardware costs $3500 and software costs $2400?

To determine the total cost of hardware and software, you simply need to add the costs of each item together. In this case, the hardware costs $3500, and the software costs $2400. When you add these two amounts together:

$3500 (hardware) + $2400 (software) = $5900 (total cost)

This calculation confirms that the total cost is indeed $5900, making this the correct answer. Understanding the fundamental principle of addition in this kind of financial context is crucial, as it allows for accurate budgeting and financial planning when incorporating various costs for technology or other resources.