The perimeter of a triangle is 42 yards. The first side is 5 yards less than the second side, and the third side is 2 yards less
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For 
to be continuous at 
, we need to have
Note that
means that 
, but that 
is *approaching* 5. We're told that for , we have
We can write
and the limit would be
and so is discontinuous.
Note that
We can write
and the limit would be
and so