in 2012 hurricane sandy struck the east coast of the united states killing 147 and causing an estimated $75 billion dollars in damage. with a gale diaeter of about 1,000 miles it was the largest ever to form over the Atlantic basin. the accompanying data represent the number of major hurricanes strikes in the Atlanti basin (category 3,4, or 5) each decade from 1921 to 2010.

Two airplanes start at the same place and travel in opposite directions, one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.