Which expression correctly represents “eight times the difference of four and a number”? 8 (n minus 4) 8 (4 minus n) 8 (n) minus
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Make a substitution:
Then the system becomes
Simplifying the equations gives
which is to say,
Substituting this into the new system gives
Then
(meaning two solutions are (7, 13) and (-7, -13))
Volume of a cylinder is 
, where r is the radius and h is the height.
This comes from the area of a circle being
. A cylinder is the area of the base circle multiplied by its height.
Using this formula, the volume of the given cylinder is
This comes from the area of a circle being
Using this formula, the volume of the given cylinder is