The vertices of a quadrilateral in the coordinate plane are known. how can the perimeter of the figure be found?

use the distance formula to find the length of each side, and then add the lengths.

use the slope formula to find the slope of each of side, and then determine if the opposite sides are parallel.

use the slope formula to find the slope of each of side, and then determine if the consecutive sides are perpendicular.

use the distance formula to find the length of the sides, and then multiply two of the side lengths.

In a coastal town, the humidity, measured in grams of water per kilogram of air, increases by 43% for every 1 degree celsius increase in temperature. a scientist observes that the humidity on monday morning is 5.75 grams per kilogram. he wants to know how much the temperature must increase for the humidity to reach at least 49.17 grams per kilogram. let t represent the increase in temperature, in degrees celsius, from monday morning's observation. write an inequality to represent the situation, and use it to determine the desired temperature increase.