Winnie wrote the following riddle: i am a number between 60 and 100. my ones digits is two less than my tens digit. i am a primer number. what number does winnie's riddle describe? winnie's friend marco guessed that her riddle was about the number 79. why can't 79 be the answer to winnie's riddle?

Which of the following questions describes the equation g + (-4) = -5? a)what number, when added to negative four, is equal to negative five? b)what number, when added to negative five, is equal to negative four? c)what number, when subtracted from negative four, is equal to negative five? d)what number, when subtracted from negative five, is equal to negative four?