What was the original amount of Na-24 present and how long ago did it begin to decay, if 131.25g of the daughter product Mg-24 are present after 3 half-lives? The half-life of Na-24 is 14.9 hours

Pastoral farming is best described as a. a method of raising livestock and moving herds b. an african method of agriculture c. a method of cultivating crops on poor soils d. a common method of desert farming select the best answer from the choices provided a b c d