What would these boxes be? Someone plz help will give brainliest

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

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

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2