How many ways are there?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

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

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?