A linear revenue function is R = 38.75x. (a) What is the slope m? m= (b) What is the marginal revenue MR? MR = What does the marginal revenue mean? O If the number of units sold is increased by this amount, the revenue decreases by $1. O Each additional unit sold decreases the revenue by this many dollars. O If the number of units sold is increased by this amount, the revenue increases by $1 Each additional unit sold yields this many dollars in revenue. (c) What is the revenue received from selling one more item if 42 are currently being sold? What is the revenue received from selling one more item if 74 are being sold