Consider the following function: ex = y?ey Find " when y = 5. Round your answer to 2 decimal places. Challenge 3 Consider a polynomial function with two independent variables x and y. If fxx = a, fyy = b, fxy = a*b, where a is the first digit of your student number and b is the last digit of your student number. If a _b-(ab)2 _0, then the function has a saddle point. With regard to the first blank, which of the following math operations is correct? O (No answer given) O With regard to the second blank, which of the following signs is correct? O (No answer given) O