The amount of a sample remaining after t days is given by the equation mc005-1. Jpg, where a is the initial amount of the sample and h is the half-life, in days, of the substance. A sample contains 18% of its original amount of radon-222. The half-life of radon-222 is about 3. 8 days. Which is the best estimate for the age of the sample?.

Assessment includes a. interviews, recorded conversations, videos, frequency counts, and time samples. b. formal standardized tests and developmental screening tools. c. various types of documented observations, documentation of child work, checklists, rating scales, and standardized tests. d. anecdotal notes, narratives or daily records, daily health checks, and teacher observation checklists.

Suppose you live in location a, a part of the united states with a semiarid climate . you travel to location b, which is in a neighboring area . there you would find a humid continental climate. in which direction is location b likely to be , relative to location a? what is an explanation for the difference

Aschool cafeteria has 40 tables. 35% of the tables have 8 chairs at each table. the remaining 65% of the tables have 6 chairs at each table. complete the model. then complete the statements to find the total number of chairs in the cafeteria.