Part D Establishing causality is often a main focus of statistical studies. What is the best type of study to
conduct to establish causality? Use the situation in this task to support your answer.

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

What is the value of the expression below? (81^2)^1/8

Joanie wrote a letter that was 1 1/4 pages long. katie wrote a letter that was 3/4 page shorter then joagies letter. how long was katies letter