Which is a better approximation of the square root of20, 4.5 or 4.47

Planning for the possibility that your home might get struck by lighting and catch on fire is part of a plan for ?

An airport in death valley is 60 feet below sea level, and an airplane is flying 2,000 feet above sea level. how many feet must the plane descend in order to land? a. 2060 b. 2000 feet c. 1940 feet d. 1880 feet e.1400 feet will mark as brainliest

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.