What were Morrie's errors? Check all that apply. He should have made all the signs positive. He should have changed Negative StartFraction 5 over 6 EndFraction minus (negative three-fourths) to Negative StartFraction 5 over 6 EndFraction + three-fourths He should have found the common denominator, 12. He should have subtracted StartFraction 5 over 6 EndFraction and Three-fourths The answer should be Negative StartFraction 1 over 12 EndFraction