divide c^6 by common factor c^4
$$\\c^6\div c^4\\ =c^{6-4}\\ =c^2\\\\ $Now why is this true?$\\\\ c^6\div c^4\\\\ =\frac{c^6}{c^4}\\\\ =\frac{cccccc}{cccc}\\\\ =\frac{cc\not{c}\not{c}\not{c}\not{c}}{\not{c}\not{c}\not{c}\not{c}}\\\\ =\frac{cc}{1}\\\\ =c^2$$