Answers

2014-09-15T20:48:40+08:00
Two packet of graphing paper because in every packet there are 25 sheets
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2014-09-15T20:50:17+08:00
He will be needing 4 packets of Graphing paper.
There are 28 students, each needed 3 sheets
28*3= 84sheets are needed in the class.

3 packets= 75 sheets, short for 9 sheets.
4 packets= 100 sheets.

Therefore, 4 packets of graphing paper are needed by the class. If it is possible to by 3 and 1/2 packets then it is enough. 

Hope I help you. :) God Bless!
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