Question: Write a C++ function named grade_avg that accepts two floating-point numbers as parameters (i.e., grade1 and grade 2). grade_avg calculates and returns the average of

Write a C++ function named grade_avg that accepts two floating-point numbers as parameters (i.e., grade1 and grade 2). grade_avg calculates and returns the average of the two grades if grade1 and grade 2 are greater than zero otherwise grade_avg will return -1. This function returns a value of type float.

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