1. The quantity for a 17-inch LCD TV is 20,000 at a price of Php25,000, while 45,000 is demanded for the price of Php15,000. Assuming a linear relationship between price and quantity, which of the following models the price-quantity function of the LCD TV? 2. Suppose that the demand function for a certain brand of shampoo is D(x) = -1.25x + 525. What is the highest price anyone will be willing to pay for the shampoo? 3. The cost and revenue function for a particular brand of bag are C(x) = 6x + 3 and R(x) = 19 - 2x. What is the break even point? 4. A young entrepreneur is willing to supply 60 pieces of personalized baller band at a price of Php80 and 100 at a price of Php110. Assuming a linear relationship between price and quantity, which of the following models the price-quantity function of the baller band