Can someone please help me answer this?

Q2: Use the Intermediate Value Theorem to answer the following questions. (a) Explain why the equation cos 8 10 has both a positive solution and negative solution for a. Be sure to justify your answer with both words and mathematical expressions. (b) Consider the equation r tan(2) = 2x -4. Explain why we can't use the Intermediate Value Theorem to conclude that the equation has a solution in (0, #) even though for the function g(2) = a tan(a) - 2x + 4, we can compute that g(0) = 4 and g(7) = 4 - 2x