While reading his favorite outdoor sports magazine, Jeff sees an advertisement for a new camping tent that is designed for quick setup. At the bottom of the page is a black-and-white square. Using an app on his phone, Jeff scans the square and a video displays on his phone's screen showing how easy the tent is to set up. The item that Jeff scanned on his phone is called a(n).

1)consider the following code snippet: #ifndef book_h#define book_hconst double max_cost = 1000.0; class book{public: book(); book(double new_cost); void set_cost(double new_cost); double get_cost() const; private: double cost; }; double calculate_terms(book bk); #endifwhich of the following is correct? a)the header file is correct as given.b)the definition of max_cost should be removed since header files should not contain constants.c)the definition of book should be removed since header files should not contain class definitions.d)the body of the calculate_terms function should be added to the header file.

Which location-sharing service offers items for users as a gaming component and also allows them to collectively link their check-ins to publish a trip? a. whrrl b. buzzd c. foursquare (this option is wrong i already tried) d. gowalla for plato

Facial expressions and gestures are examples of messages.