Omar runs 8 miles in 84 minutes. At the same rate, how many minutes would he take to run 6 miles?

Asimple random sample of size nequals14 is drawn from a population that is normally distributed. the sample mean is found to be x overbar equals 70 and the sample standard deviation is found to be sequals13. construct a 90% confidence interval about the population mean

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

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"