We have that In 1982 Pennies minted at the time was approximately same a the density of Pure copper at 8.95g/cm^3, But then the slope line went towards the Zinc and Pennies mined was approximately same a the density of Pure Zinc (Zn)
7g/cm^3.
From the question we are told that
The density of copper with the value for the slope of the line for the pre-1982 Pennies
Generally
it is important to note that Pennies are Made of Copper(Cu) and Zinc(Zn)
About 95+ percentage of Pennies is made of Zinc and 5-Percentage is mad of copper
In 1982 Pennies minted at the time was approximately same a the density of Pure copper at 8.95g/cm^3, But then the slope line went towards the Zinc and Pennies mined was approximately same a the density of Pure Zinc (Zn)
7g/cm^3.
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