please tell me the step process of this btw this is 7th-grade math its angle measurements I'm confused about the process pls help.

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

What is the difference between regular convex and concave polygons

The following frequency table relates the weekly sales of bicycles at a given store over a 42-week period.value01234567frequency367108521(a) in how many weeks were at least 2 bikes sold? (b) in how many weeks were at least 5 bikes sold? (c) in how many weeks were an even number of bikes sold?