Elena and Jorge have similar problems and find the same answer. Each determines that the solution to the problem is 24. Elena: (14 + 42) ÷ 7 + 42 Jorge: 14 + (42 ÷ 7) + 42

56 ÷ 7 + 42 56 ÷ 7 + 42

56 ÷ 7 + 16 56 ÷ 7 + 16

8 + 16 8 + 16

24 24

Did both students evaluate the expressions correctly? What mistakes were made, if any?

How do you graph linear equation x+y=4

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

Given the expression (7 ? 4i) ? (2 + 6i), perform the indicated operation and write the answer in the form a + bi.