When renting a limo for prom, the number of people varies inversely with the cost per person. Originally there were 10 people and the cost
per person was $20. If the number of people changed to 4, what would
be the new cost per person?

Really need on these. i have no idea what to do

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

Write the slope-intercept form of the line that passes through the point (1, 0) and is parallel to x - y = 7. t