i got the correct answer of -7/9. The answer box said decimals accepted, or something along those lines. I put down .7777 and got a wrong answer message along with the message, the correct answer is .777......... Now the correct answer given had something like 30 decimal places. It is upsetting to solve a problem correctly and have it graded as incorrect for something like this. I would prefer it if the answer box said something like "Fractions accepted.", or show answer to 30 significant decimal places".
Calvin edit: The answer that you wrote was "-777", instead of "-0.777". There was a missing decimal point, hence you were marked wrong.