the answer is different.
But, here's your opportunity to learn something new -- how to
use a table. So go back and figure out which row you need to look
across and which column you need to look down in order to get the number
of "pieces of styrofoam collected on the 4th trip". The tip here
is to look at the right headings and follow them to the intersecting entry.
Wonderful new scientific mysteries will be revealed to you.