Patty has just completed her second semester in college. she earned a grade of upper c in her 4-hour calculus course, a grade of upper d in her 11-hour psychology course, a grade of upper a in her 4-hour physics course, and a grade of upper c in her 2-hour studio art course. assuming that a equals 4 points, b equals 3 points, c equals 2 points, d equals 1 point, and f is worth no points, determine patty's grade-point average for the semester.