Which is greater : -999 +1 or -999 + (-1)? explain

(60 points) explain this in detail

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?

Cole says the distance between points (-5,0) and (0,-5)is 5 units. is he correct? explain why or why not.