Find the equation of the tangent line to the curve at the given point. 39. Business A casino hotel manager has approximated demand for two room suites to be where p is the price (in dollars) and q is the quantity demanded. Use implicit differentiation to find and interpret when g - 5. dp41. Business A night club has approximated the demand for their Thursday night drink special by p + 100g = 100, where' e is the price (in dollars) and q is the quantity demanded da (in thousands). Find and interpret dp when the price is $6 and the demand is 8010 drinks.45. Business For PepsiCo, Inc., the relationship between reve nue R (in millions) and number of employees a (in thousands] can be approximated by AR- - 9610- Find when n = 160 and R - 31.370. (Data from: Www. mergentonline.com.)