Elena and Jada each make money by helping out their neighbors. ---Elena babysits. Her earnings are given by the equation y = 8.40x, where x represents how many hours she works and y represents how much money she earns. ---Jada earns $7 per hour mowing her neighbors’ lawns. a. Who makes more money after working 12 hours? How much more do they make? Explain how you know. b. What is the rate of change for each situation and what does it mean? c. How long would it take each person to earn $150? Explain or show your reasoning.