NEED HELP ASAP PLS PLS PLS At 9:00 a. m., the temperature at an Arctic observatory was −12°F. By 5:00 p. m., the temperature had risen 5 degrees. Over the next three hours, the temperature had dropped 2 degrees.

What was the temperature at 8:00 p. m.?

You decide instead to take the train there. the train will take 135 minutes. convert this into hours and minutes.

You are cycling around europe with friends. a cycling festival is starting soon in barcelona. it will take 4.5 hours to cycle there. how many minutes in total is this?

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