Final answer:
The powers allowing Congress to carry out its duties that are not expressly stated in the Constitution but are assumed necessary are known as implied powers.
Step-by-step explanation:
The powers that the federal government is not expressly granted but that it is assumed to possess in order to carry out its duties are called the implied powers.
These are powers that have been determined to be necessary for the functioning of the national government and are logical extensions of the expressed powers. For instance, the elastic clause—Article I, Section 8 of the Constitution—has allowed Congress to stretch its authority and establish agencies like the IRS, and enforce regulations under the guise of implied powers.