An art teacher needs to buy 20 shirts for a class project. She can buy the
shirts at a local store or online. This graph shows the costs, in dollars, for
different numbers of shirts at a local store.
Costs of Shirts
at a Local Store
Total Cost ($)
2
4 6 8 10 12
Number of Shirts
A. Based on the graph, what is the cost, in dollars, for each shirt at the local
store? Show or explain how you got your answer.

What is the product? (x2+3y+7) [yy+1)

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

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)