2. Researchers suspect that 18% of all high school students smoke at least one pack of
cigarettes a day. At Wilson High School, with an enrollment of 300 students, a study
found that 50 students smoked at least one pack of cigarettes a day. At a =0.05, can
the study conclude that 18% of all high school students smoke at least one pack of
cigarettes a day?

If 90° < θ < 180° and cotθ = -1/3, then cscθ =

Jonah runs 3/5 miles on sunday and 7/10 mile on monday. he uses the model to find that he can ran a total of 1 mile . what mistake does jonah make

The rate of decay of a radioactive substance depends upon the amount present initially. the mass y (mg) of the radioactive substance cobalt-60 present in a sample at time t (years) is represented by the exponential equation y=50e −0.1315 t . answer the following questions in complete sentences. 1. how does the exponential equation above compare to the equation for simple interest that is compounded continuously? explain the similarities. 2. what is the initial amount of cobalt-60 in the sample? 2. how much cobalt-60 is left after 8.4 years? show your work. 3. what would be the y-intercept of the graph? what does it represent? 4. after how many years will the amount of cobalt-60 left be 6.25 mg? explain what happens to the cobalt-60 after 50 years? 5. discuss some “real-world” examples and uses of cobalt-60