Which powers allow congress to make all laws necessary and proper for carrying out other powers?
allow congress to make all laws necessary and proper for carrying out other powers.

Article I, Section 8, Clause 18 allows the Government of the United States to: "make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution."

Clause 18 of Article 1 of the U.S. Constitution allow Congress to make all laws necessary and proper for carrying out other powers.

Explanation:

The "Fundamental and Proper Clause," officially drafted as Clause 18 of Article 1 of the U.S. Constitution and furthermore known as the versatile proviso, is one among the most dominant and significant statements in the Constitution.

Provisions 1–17 of Article 1 identify the entirety of the forces that the legislature has over the enactment of the nation. Condition 18 enables Congress to make structures sorting out the legislature, and to compose new enactment to help the unequivocal forces identified in Clauses 1–17.

Article I, Section 8, Clause 18 permits the US government to:  "make all laws which will be essential and appropriate for conveying into execution the prior forces, and every single other power vested by constitution."  

The meanings of "important," "appropriate," and "conveying into execution" have all been bantered since the words were composed during the Constitutional Convention in Philadelphia in 1787. There is a solid probability that it was kept deliberately ambiguous.

the numbers are even higher.

explanation:

statistics have shown that more that 60% of test takers fail the first time and have to retake the test.