Choose the correct sum of the polynomials (2x3 - 5x - 1) + (4x + 8x + 3).
o 2x3 – 3x - 4
o 6x® + 3x + 2
2x3 + 3x + 2
o 6x3 - 3x - 2

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

6cm10 cma conical paper cup has dimensions as shown in the diagram. how much water can the cup hold when full?

The price of one share of a company’s stock declined $13.89 every day for 2.5 days what was the stocks total decline in price