In 2015, a company made 2.7×10^11 mailboxes. in 2019, the same company made 3.9×10^12 mailboxes. how many more mailboxes did they make in 2019? (write your answer in scientific notation.)

Adrawer contains 12 identical white socks, 18 identical black socks and 14 identical brown socks. what is the least number of socks you must choose, without looking, to be certain that you have chosen two socks of the same colour?

Which of the following can be used to explain a statement in a geometric proof?

Amayoral candidate would like to know her residents’ views on a public open space before the mayoral debates. she asks only the people in her office. her co-workers are an example of a census population convenience sample simple random sample