Tristan invests $8100 in two different accounts. The first account paid 10%, the second account paid 11% in interest. At the end of the first year he had earned $842 in interest. How much was in each account?

6n^2-7n-75=0 solve by quadratic formula

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

Amachine part consists of a half sphere and a cylinder, as shown in the figure. the total volume of the part is π cubic inches.