the quantity of a radioactive substance foows the law of uninhibited decay. if 121 grams are present to start and after 12 minutes, approx. how many grans will be present after 36 mins?

The area of a square floor on a scale drawing is 64 square centimeters, and the scale drawing is 1 centimeter: 3 ft. what is the area of the actual floor? what is the ratio of the area in the drawing to the actual area? the area of the actual floor is square feet. the ratio of the area in the drawing to the actual area is 1 square centimeter: square feet.