Declare (give a prototype for)a function named average_grade.This function returns a double and has four double arguments,test1,test2,test3,test4.The return value should be the average,or arithmetic mean of the four arguments.Be sure to include a "prototype comment" that tells briefly what the function does.

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The Answer of Declare (give a prototype for)a function named average_grade.This function returns a double and has four double arguments,test1,test2,test3,test4.The return value should be the average,or arithmetic mean of the four arguments.Be sure to include a "prototype comment" that tells briefly what the function does.

Declare (Give a Prototype For)a Function Named Average_grade