What is the value of the z in this equation z - 18 = 21

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

Which of these triangle pairs can be mapped to each other using two reflections?

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