Consider the following geometric sequence -5, 10, -20, if the recursive formula for the sequence above expressed in the form a(n)=b*c^n-1, determine the value of b and c.

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%