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2 answers:
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The formula for density of an object is Density= 
First you plug in the information you already know. 163.5= 
Now you have to solve for the mass so you multiply 0.492 by 163.5 
Lastly, you simplify and you will get 80.44. Hope this helped :)
Answer:
x = - 6 ±
Step-by-step explanation:
Given
x² + 12x = 1
To complete the square
add ( half the coefficient of the x- term )² to both sides
x² + 2(6)x + 36 = 1 + 36
(x + 6)² = 37 ( take the square root of both sides )
x + 6 = ± ( subtract 6 from both sides )
x = - 6 ± ← exact solutions