Can someone also help me with this math problem pls

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

What is (28 + 7 + 6 + 3) x 1/2 show your work

An optical inspection system is used to distinguish among different part types. the probability of a correct classification of any part is 0.92. suppose that three parts are inspected and that the classifications are independent. let the random variable x denote the number of parts that are correctly classified. determine the probability mass function of x. round your answers to four decimal places (e.g. 98.7654). x f(x) 0 1 2 3