Solar panels today are lot more affordable, and their are many programs that help house owners install them. Also excess energy can be stored or sold to electric companies!
1. The time for a radioactive sample to reduce to half of its original mass. 4. 10% of 232 is 23.2 times 6 equals 139.2 68.9 x6 equals 413.4 5. 0.37kg 6. 2000 years 7. 6.84 seconds
