Discover Questions

I keep doing doing this question over and over again and I can't find the answer :( Can someone please answer it and show me how you got it? What are the scientific properties of igneous rock?? e.g CO2 etc.? What would tin(IV) arsenide be in a formula? In 11 days the number of radioactive nuclei decreases to one-eighth the number present initially. What is the half-life (in days) of the mat? What are the formulas for factoring perfect squares and the difference of squares? Give an example of each and factor. (Please show work)?