Josue broke a cell sample into 12 batches, each weighing 6.9 x 10 ^-10 grams. How much did the original sample weigh? Use scientific notation to express your answer.

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%