49 080 tickets have been sold for the tournament. 3 /5 of the tickets are for the qualifying matches and 15% of the tickets are for the final match. how many tickets sold are for the semi-final matches

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

The ratio of men to women working for a company is 4 to 5 . if there are 90 women working for the company, what is the total number of employees?

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