divideNumber function and multiplyNumber

1.(i)add a divideNumber function and multiplyNumber function. have a header file and it should perform the following equation using many variables you want and calling math function (((3-2)+(4*6))/(3+2))*7=?"
(ii) create a new program, using the code from above question 1(i) to ask the user for a number, then add the number to 5, divide it by 3, multiply it by 7 and subtract 8 from it. test if the answer to any of those operations is negative and print "You LOSE" if any are negative.
(iii)Modify the above question to ask the user’s name before asking for mathematical input. You do not need to check if their name is correct. You should use a while loop around the other input, however.Accept their name using fgets.
Accept their sign +,-,*,/ using fgets as well. Remember that this will be only one character. What array index should you grab then?