Vaccines are made of mixtures that contain either parts of pathogens or whole pathogens that prepare the body's defenses to fight against the pathogens.
The ratio of the height (h) of the streetlight to its distance to the end of Laura's shadow is the same as the ratio of Laura's height to her distance from the end of her shadow. .. h/(12+9) = 5'4"/9 .. h = (21/9)*5'4" = 12 4/9 feet .. h = 12 ft 5 1/3 inches
