Well they give us some information. They say G of zero is equal to 91, so let's write that down. So when T is zero, G is 91, so we can write, let me write it over here. So three times, so when T is zero, G is 91. 91 minus 27 to the 1 3rd power is equal to negative T. Well now we're saying T is zero, so we could write negative zero there, or we could just not write it, and then plus C. So that's what C is going to be equal to. Let's see, 91 minus 27 is 64. 64 to the 1 3rd power is positive four, and so we have C is equal to 12.