has just completed her second semester in college. She earned a grade of A in her 3​-hour calculus ​course, a grade of A in her 5​-hour economics ​course, a grade of A in her 1​-hour biology ​course, and a grade of C in her 3​-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 Patty​'s ​grade-point average for the semester. Patty​'s grade point average is nothing.