A publishing company produces 15 books in 3 hours. How long would it take to produce 20 books at the same rate?
2 answers:
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The formula for that is V=
but the answer is 4,940cm³ so C.
but the answer is 4,940cm³ so C.
You could rewrite 
as
and be tempted to cancel out the factors of
. But this cancellation is only valid when 
.
When
, you end up with the indeterminate form 
, which is why 
is not a zero.
and be tempted to cancel out the factors of
When