Jamie has just completed her second semester in college. she earned a grade of upper b in her 2-hour calculus course, a grade of upper a in her 4-hour government course, a grade of upper a in her 2-hour physics course, and a grade of upper f in her 5-hour creative writing 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 jamie's grade-point average for the semester