Technetium-99m is used as a radioactive tracer for certain medical tests. It has a half-life of 1 day. Consider the function T where T(d) = 100(2)^-d is the percent of Technetium-99m
remaining d days after the test. Which expression represents the number of days until only
5% remains?

Complete the statements about the system of linear equation respresented by the tables the equation respented the left table is

How is working backward similar to solving an equation?

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.