The density of an object is obtained by taking the ratio of the mass of the object and its volume ; 
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- However, the required formular for calculating the density of an object is :
- The mass of the object is measured in gram(g) or kilogram(kg)
- The volume of the object measured in Litre or any equivalent unit.
Therefore, the density of the object is the ratio of its mass and volume.
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For this case we must write in algebraic symbology the expression described above:
We have an equation, then:
- x squared plus y squared:

- minus 2x plus 7y plus 1:

- equals zero:

We construct the equation:

Answer:

First let's put them all over 100.
-

would change to -

-

to -

-

to -
-

to -

Then if we put them from least to greatest it would be from highest to lowest (since they are negatives)
-

, -

, -

, -
The answer would be B
I don't have a calculator with me, but that should get you going