Atourist sailed against the current on a river for 6 km, and then he sailed in a lake for 15 km. in the lake he sailed for 1 hour longer than he sailed in the river. knowing that the current of the river is 2 km/hour, find the speed of the boat while it is traveling in the lake.

How do you answer this question? (step by step)

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

Do,h = (7, 9) (14, 18) the scale factor is