On a cloudy day, Joan needed to know the height of a window in a building. Joan positioned a mirror on the ground between herself and the building so that when he looked in the mirror, she saw the window. If the mirror was 19.93 cm from her feet and 31.33 m from the base of the building and Joan's eye was 1.91 m above the ground, how high up on the building was the window located? Round to the nearest unit.

Pokój na planie w skali 1: 100 jest prostokątem i ma wymiary 5,2cmx4,4cm. jaką powierzchnię w m2 ma pokój? ile m bieżących wykładziny dywanowej o szerokości 5m trzeba kupić by wyłożyć cały pokój jednym kawałkiem przy minimalnych stratach ? ile zapłacimy za wykładzinę jeśli 1m2 kosztuje 30 zł ?

Three friends went on a road trip from phoenix, az, to san diego, ca. mark drove 50 percent of the distance. jason drove 1/8 of the distance. andy drove the remainder of the distance. 1. andy thinks he drove 1/4 of the distance from phoenix, az, to san diego, ca. is andy correct? 2. the distance from phoenix, az, to san diego, ca, is 360 miles. how many miles did each person drive? 3. solve the problem. what is the answer in total?

Use sigma notation to represent the following series for 9 terms.