Anyone wanna help me with this??

What is the solution to the equation 9^(x+1) =27

Jeremy wants to determine the number of solutions for the equation below without actually solving the equation.

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?