So here they say, can we use the intermediate value theorem to say that there is a value c such that f of c equals zero and two is less than or equal to c is less than or equal to four? If so, write a justification. So we are given that f is continuous. So let me write that down. We are given that f is continuous. And if you want to be over that interval, but they're telling us it's continuous in general. And then we can just look at what is the value of the function at these endpoints.