Please answer the following questions step by step. I am in first year university so please keep solutions to that level. Thanks

Question 3 (7 points) Cost/Average Cost A linear cost function, in dollars, is given by C(q) = mq +b where $ b is the fixed cost, m ($/item) is the marginal cost and q is the number of items. a) Determine lim C(q) = lim - (9) Is l'Hospital's rule applicable? Justify (5 points) 9 b) Interpret contextually your finding in question a) above. (2 points) Question 4 (8 points) It was decided that the sea level (mm) in question 2 is better modeled with the following function: 415 s (1) = - 1+15e-0.0041 Here t = 0 corresponds to the year 1900. Determine the long run sea level predicted by the updated model above. Question 5 (10 points) Determine for what value(s) of x the function f (x) =25x+ - has a horizontal tangent x line