Since the FREQUENCY function is an array function, once it is typed into a cell you must press ________ in order for it to calculate properly

Given infix expression a + b Which of the following is the equivalent postfix expression?

a. b + a b. + a b c. a b + d. + a b +

Which of the following statements correctly specifies two interfaces?

a. public class ClassA implements [Interface1, Interface2] b. public class ClassA implements (Interface1, Interface2) c. public class ClassA implements Interface1, Interface2 d. public class ClassA implements Interface1 | Interface2