Finding the percent of a Number The Percent Circle
Р
To Use the Percent
Cinde
1 Cover the symbol of
the number you are
looking for
% x W
Do the oth
by the covered
wake
The formula: Using percent circle
1) What is the formula for finding the part?
2) What is the formula for finding the Percent (%)?
3) What is the formula for finding the whole?

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year the population of her town is changing by a constant rate

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

For each proportion find the unknown number x 1/5/8=×/15