What is y to the third power multiplied by x to the negative 2 power?

It depends on what number y and x are. If y is the number, say...2 than you would multiply 2 to the third power like this: 2x2x2=8 and the x would be 9: 9x-9=-81 multiply 8 and 81 and that will be your answer. Hope that helps in Math Class! :0)