How
Assignment
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Estimating Area of a Circle
What is the approximate circumference of the circle?
What is the height of the parallelogram?
What would be the approximate length of the
parallelogram if the base were completely straight?
What would make the estimation of the circle's area more
precise?
What is the area of the circle used to create the
parallelogram-like shape to the nearest tenth of a square
unit?
Hint

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

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