Worth brainliest and 10 points

which equations support the fact that rational numbers are closed under addition?

select each correct answer.

√10+(−√10)=0

3√16+3√16=6√16

3√5+√5=4√5

1/2+0.5=1

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

Me! 50 points! why does when we come home, our door is unlocked and there is grease on the door knob, me solve this , and i don't know what category this goes under

At the olympic games, many events have several rounds of competition. one of these events is the men's 100-meter backstroke. the upper dot plot shows the times (in seconds) of the top 8 finishers in the final round of the 2012 olympics. the lower dot plot shows the times of the same 8 swimmers, but in the semifinal round. which pieces of information can be gathered from these dot plots? (remember that lower swim times are faster.) choose all answers that apply: a: the swimmers had faster times on average in the final round. b: the times in the final round vary noticeably more than the times in the semifinal round. c: none of the above.