2) Carbon-14 is a radioactive isotope often used in dating archaeological and geological artifacts. If Carbon-14 has a half-life of approximately 6,000 years and you have a 100mg sample then how much of it will be remaining in 18,000 years?

Which statement accurately explains whether a reflection over the x-axis and a 180° rotation would map figure acb onto itself?

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

20.ju inces. which ordered pair is a viable solution if x represents the number of books he orders and y represents the total weight of the books, in ounces? (-3,-18) (-0.5, -3) (0,0) (0.5, 3)