1: A student is taking six courses and is facing the crunch of final exams. She estimates that she has 60 hours available to study. If xj = the number of hours allocated to studying for course j. State the equation whose solution set specifies all possible allocations of time among the six courses which will exhaust the 60 hours available. 2: The function C(x) = 15 x + 80000 expresses the total cost C (x) (in dollars) of manufacturing x units of a product. If the maximum number of units which can be produced equals 50000, state the restrictive domain and range for this cost function