Asingle tree produces about 2.6 × 10² pounds of oxygen each year. the amazon rainforest has about 3.9×1011 trees. about how many pounds of oxygen are produced in the amazon rainforest per day? enter your answer in the box. 2.8 × 10 pounds per day

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%