pls help me im soo confused pls show the work 1.) 4/7 + 1/3 2.) 1/2 + (-3/10) 3.) 5/12 + 23/24

Out of the 180 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? 72% 40% 54% 98%