2. Tweety makes a $90 equal payment every month over 120 months. After 120 months, Tweety will not have any debt left. Disregard any interests. 2.1 Express the amount of debt remaining as a function of time in months. Indicate the input and output of the function. 2.2 Sketch a graph of the function. Label and scale both axes appropriately. 2.3 What is the initial amount of debt? 2.4 What is the reasonable domain for this function? 2.5 Provide a practical interpretation of f(110) = 900.