Observe that the type of [fold] is parameterized by _two_ type variables, [X] and [Y], and the parameter [f] is a binary operator that takes an [X] and a [Y] and returns a [Y]. Can you think of a situation where it would be useful for [X] and [Y] to be different

Wireless communications is likely to be viewed as an essential part of an enterprise network infrastructure when: select one: a. mobile communication is needed b. communication facilities must be installed at low initial cost c. communication must take place in a hostile or difficult terrain that makes wired communication difficult or impossible d. the same information must be broadcast to many locations

What is a society that has moved to the internet rather than relying on physical media called

Dean wants a quick way to look up staff members by their staff id. in cell q3, nest the existing vlookup function in an iferror function. if the vlookup function returns an error result, the text “invalid staff id” should be displayed by the formula. (hint: you can test that this formula is working by changing the value in cell q2 to 0, but remember to set the value of cell q2 back to 1036 when the testing is complete.)