#12. The average of Aaron's three test scores must be at least 93 to earn an A in the class. Aaron scored 89 on the
first test and 94 on the second test. What scores can
Aaron get on his third get on his third test to guarantee an
A in the class? (The highest possible score is 100.)
a. Write an inequality that models this situation. The
variable x represents the 3rd test score. Fill in the correct
parts of the equation.

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

What is the value of 13x^-3y^-1 when x=-1 and y=4

Mikael, hema and 5 friends will run an event. they will wear either a red shirt or red baseball hat during the event. they want to spend exactley $40. shirts cost $8 each and caps cost $4 each.