Ever have a problem with math? Let me tell you a story that always annoys me. Computer gives you a math problem. You solve it. You are 85% sure that it's right. Submit answer; nope, wrong! Look for the help button. View procedure. You solved it exactly the same way the computer did. Mindblown. Continue submitting supposedly "wrong" answer. Computer gives answer. "I'm sorry. You did not put a zero in front of the decimal". My answer .2 and the computer answer 0.2. You're a failure, F- for you.