Pls help ill give branliest just need the empty one (NO LINKS OR FILES)

Which expressions are equivalent to -6 + 3m

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 25, a standard deviation of 2.5, and margin of error of 5%