// the calling statement is: cout << 4 * mystery(6, 3.9, 'D') « endl; //function int mystery(int x, double y, char ch) { int u; if ('A' <= ch && ch <= 'R') return(2 * x+ static_cast(y)); else return(static_cast(2 * y) - x);

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A: the answer is given below:-

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A: GIVEN: A pentagonal number is defined as for and so on. So, the first few numbers are 1, 5, 12, 22,…

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Q: Q2) (Perfect Numbers) An integer number is said to be a perfect number if its factors, including 1…

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A: The function for the about given program is given below:

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A: The Matlab code for this question is attached as follows:

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