Question $1(4$ points$)$

According to the US Mint, pennies are made of a mixture of Copper $($density $8\mathrm{.}96\frac{g}{c}{m}^3)$ and Zinc $($density $7\mathrm{.}14\frac{g}{c}{m}^3).$

a$)$ What should the penny's density be if it is completely made of copper?

b$)$ What should the penny's density be if it is completely made of zinc?

c$)$ What is the range of density for a penny made of a mixture of copper and zinc? $($note: "range" is not "difference".$)$