An expression is shown below:

3x3y + 12xy − 9x2y − 36y

part a: rewrite the expression so that the gcf is factored completely. show the steps of your work. (4 points)

part b: rewrite the expression completely factored. show the steps of your work. (6 points)

Out of the 150 students at a summer camp, 72 signed up for canoeing. there were 23 students who signed up for trekking, and 13 of those students also signed up for canoeing. use a two-way table to organize the information and answer the following question: approximately what percentage of students signed up for neither canoeing nor trekking?