Which precedent was set by the northwest ordinance and later included in the u. s.
constitution?

Northwest Ordiance prohibited slavery and that provision was later included into the US constitution as Amendment 13

Explanation:

the answer is b. 300t + 3/2xt

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.