The derivative of y with respect to x is 1 1 2 x to the negative 1 1 2. So let me write that down. 1 1 2 x to the negative 1 1 2. And then times the derivative of x with respect to t. Times the derivative of x with respect to t. So let's see, we wanna find what we have here in orange. That's what the question asks us. They tell us when x is equal to nine and the derivative of x with respect to t is equal to 12. So we have all of the information necessary to solve for this.