Word problem with multiple decimal operations: problem type 2
rafael bought 2 cds that were each the same price. including sales tax, he paid a total of $24.60. of that total, $1.80 was tax. what was the price of each cd
before tax?

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

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

Twice the sum of a number and 2 is equal to three times the difference of the number and 8. find the number.