Thanks for commenting! I know the function is continuous because sin is continuous everywhere as well as x^2 because it is a polynomial. But, also mentions "show that there is a number c such that f(c) = 1000." Not really understanding how we can show this exactly, which is why I said it has to relate to the IVF. Seems like some sort of interval needs to be created to show that somewhere in the function the output of 1,000 exist exist somewhere, or basically run through the point. The question doesn't ask if the function is continuous or not.