39. Let k be a constant of proportionality and let w, x, y, and z be positive real number variables. In which of the following equations does x vary directly with y, directly with the square of w, and inversely with z ?

Answer and Explanation

Your Answer is

Correct Answer is B

Explanation

Put the one that is directly proportional to x in the numerator and the one that is inversely proportional to x in the denominator, and you get B.