Please assist with the following question

7 of 25 Economic profit is the difference between and O total revenue, explicit costs O total revenue; implicit costs O total revenue; total costs O profit; total costs 8 of 25 In Perfect Competition, the term "shutdown point" refers to the point where the O marginal cost curve crosses the total revenue curve. average variable cost curve crosses the total revenue curve. O average variable cost curve crosses the marginal cost curve. O marginal cost curve crosses the average variable cost curve. 9 of 25 The cost curve intersects the cost curve at the minimum point of the latter. O average, marginal O fixed; variable O marginal; average O total; fixed