Sarah has gone to work for 60 days on 39 of those days she arrived at work before 8:30 a.m. On the rest of those days she arrive
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If we substitute and
, we get
, so that
which is independent of , which in turn means the surface can be treated like a surface of revolution.
Consider the function defined over
. Revolve the curve
described by
about the line
. The area of the surface obtained in this way is then