3. how many significant digits are in each measure?
a) 12.25°c:
c) 1000 s: at least
b) 0.075 kg:
d) 205.09 m/s:

The sum of two numbers is 86, and their difference is 20. find the two numbers

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

The sum of the reciprocal of a positive number and the reciprocal of 2 more than the number is 3/4 equation: the number is