Aspinner is divided into 8 equal sections numbered 1 through 8. which 2 events are disjoint? a. spinning an even number and spinning a 6 b. spinning an odd number and spinning a 3 c. spinning a number less than 4 and spinning a 3 d. spinning a number less than 4 and spinning a 6 d. spinning a number less than 4 and spinning a 6

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

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

Anumber cube is rolled two times in a row. find the probability it will land on 2 on the first roll and a number greater then 4 on the second roll