CAN ANYONE help me with these questions?

1. In a perfectly competitive industry where all firms have marginal costs that are increasing functions of quantity produced, the short fun industry supply curve is while the long run industry supply curve is a.) a positively sloped line,- a horizontal line b.) a negatively sloped line; a horizontal line. c.) a positively sloped line; a positively sloped line. d.) a horizontal line; a positively sloped line. e.) None of the above. 3. Dominique's preferences are described by the utility function U(X, Y) = min{4X, Y} and the price of good X is three times the price of good Y. Dominique currently possesses 20 units of good X and 45 units of good Y. What is Dominique's optimal consumption of good X? a.) 105 units. b.) 65 units. c.) 20 units. d.) 15 units. e.) 12 units. 4. Bert and Ernie meet for coffee every morning at their local cafe. Ernie's inverse demand curve for cups of coffee is P = 10 - 2Q while Bert's inverse demand curve for cups of coffee is P = 5 - 0.5Q. What is their joint demand for coffee when the price per cup of coffee is $4 and $6 respectively? a.) 5 cups and 6 cups. b.) 6 cups and 5 cups. c.) 5 cups and 6 cups. d.) 5 cups and 2 cups. e.) None of the above