please, solve this questions and provide detailed and clear and correct answers.

thank you in advance.

this is c++

(a) Write the return type that indicates a function does not return a value. (b) Write a short example of a predicate function. (c) Considering the functions f, g, and h determine the results of the function: call f (h(-2) , g(0)) g (1) double h( double x) return x*x, ) double g ( double y) l return 0.5 * h(y)) double f ( double x, double y) ( return g(y) +sqrt h(x) )