Final answer:
The relationship between y and x, when y is inversely proportional to the square of x, can be expressed as y = k / x², where k is the constant of proportionality. To find x when y = 25, we would solve the equation 25 = k / x² if k is known.
Step-by-step explanation:
When we say y is inversely proportional to the square of x, we can express this relationship as y = k / x², where k is a constant of proportionality. To find the constant k, we need a pair of values for x and y. However, the question does not provide this, so we'll have to express y in terms of x assuming k is known.
To work out the positive value of x when y = 25, we would substitute 25 into our equation for y, getting 25 = k / x². Assuming we know k, we can solve for x by rearranging to x² = k / 25 and then taking the square root. Without knowing k, we cannot provide a numerical answer for x.