a radioactive element has a half life of 10 days. If 800g of the element are now available in a laboratory, how much will remain after 25 days. how long will it take for the element to be less than 10 grams

21/2 or 5/2

Answercounterclockwise rotation about the origin by 180 degrees followed by reflection about the y-axisexplanationthe given figure has verticesrecall that for counterclockwise rotation about the origin, when we rotate figure pqrs counterclockwise through an angle of 180° about the origin, the coordinates will becomenext, we reflect in the y-axis by negating the x-coordinates of the resulting figure to obtain,therefore the correct answer is c