Which of the following is not a function of the legislative branch? declaring war approving treaties determining the constitutionality of a law confirming supreme court appointments

No branch can do it all under this system. The legislative branch has the responsibility of making laws. At the federal level, this is our Congress that consists of the House of Representatives and the Senate. ... Thus, the legislative branch can't carry out laws or interpret laws. So I'd go with Determining the constitutionality of a law because that's the judicial branches job.