Which best explains why these two figures are similar or not similar?

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

Solve this 364x-64x=300x and 12(x2–x–1)+13(x2–x–1)=25(x2–x–1)

Aresearch study is done to find the average age of all u. s. factory workers. the researchers asked every factory worker in ohio what their birth year is. this research is an example of a census survey convenience sample simple random sample