You have a mass of #45.026##g# that displaces a volume of #6.5##cm^3#. These units are guesses, you have not quoted any units when you set out the question.
Explanation:
So density, #rho##=##("mass")/("unit volume")##=##(45.026*g)/(6.5*cm^3)##~=##7.0##g*cm^(-3)#.