What is the circumference of a circle

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

Elizabeth is using a sample to study american alligators. she plots the lengths of their tails against their total lengths to find the relationship between the two attributes. which point is an outlier in this data set?

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?