Can someone help me with these two?

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Your best friend told you that last week scientists disco y that las vegas is responsible for abrupt climate changes. which do you think is best way to research that recent discovery? an encyclopedia usgs internet site a book in the library your best friend’s parents for your ! ❤️