3. a copy machine, working at a constant rate, makes 35 copies per minute. a second copy machine, working at a constant rate, makes 55 copies per minute. working together at their respective rates, how many copies do the two machines make in half an hour?

The state in which the manufacturing company you work for is located regulates the presence of a particular substance in the environment to concentrations ≤ x. recently-released, reliable research endorsed by the responsible federal agency conclusively demonstrates that the substance poses no risks at concentrations up to 5x. your company has asked you to consider designing a new process with a waste discharge stream containing up to 2x of the substance. based on the stated conditions, describe this possible.